JPH11203207A - Method and device for file production for production or decoding of enciphered file, storage medium storing program for the production or decoding, and device and system for information processing using the program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To encipher and decode such a document that has no serious secrecy and wants only to be prevented from being read by adding or subtracting an optional number to or from a character code. SOLUTION: A control circuit 123 temporarily stores a selected optional number in a 2nd buffer memory 119 and generates a character code by an address generation circuit 113 to the character that is inputted via a keyboard 111. An arithmetic circuit 114 adds or subtracts the said optional number to or from the character code. Then the circuit 123 transfers a character pattern of the character code corresponding to the added or subtracted number to a 1st buffer memory 116 from a character storage 115. The circuit 123 sends an enciphered file via a transmitter 120 or stores the file in an enciphered file storage device 121.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for transmitting a sentence composed of characters, symbols, etc., or a file containing numerical values, mathematical expressions, symbols, figures, etc., an information processing apparatus such as a computer or a word processor, or a network. When using the information processing device connected by a plurality of people, a file creation method for creating or decrypting an encrypted file for preventing the above file from being read or viewed by a specific person, A file creation device that creates or decrypts an encrypted file, a storage medium that has a program for creating or decrypting an encrypted file, and a program that creates or decrypts an encrypted file. Information processing device that processes a file, and creates or decrypts an encrypted file An information processing system for processing information by the eye of the program.

[0002]

2. Description of the Related Art FIG. 13 is a schematic block diagram for explaining a conventional document creating apparatus. In FIG. 13, a document creation device includes a keyboard 1311 for inputting characters and symbols, an address generation circuit 1312 for generating a character code serving as an address, and an address generation circuit 1
A character storage device 1313 in which the pattern information of the character is stored at the address generated by 312, and a buffer memory 1 for temporarily storing the pattern information of the character.
314, an output device 1315 including a display device or a printing device for outputting the characters in cooperation with an output control circuit (not shown), a file storage device 1316 for storing documents and the like stored in the buffer memory 1314, And a control device of a document creation device (not shown).

FIG. 14 is a flowchart for explaining the operation of the document creating apparatus shown in FIG. A conventional document creation device will be described with reference to FIGS. First, desired characters are input by the keyboard 1311 (step 1411). A character code which is the address of the character input by the keyboard 1311 is generated, a character pattern corresponding to the character code is extracted from the character storage device 1313, and transferred to the buffer memory 1314 (step 1412). An output control circuit that is not displayed, for example, is displayed on a display device, and a document is created while viewing the display (step 1413). The control circuit (not shown) checks whether or not the created document is stored in a file (step 1414). If the control circuit determines that there is an instruction to store the file, the control circuit stores the file in the file storage device (step 1415). If the control circuit determines that there is no instruction to store the file, the state is displayed on the display device or the state is ended.

Conventionally, many information processing apparatuses, such as the above-mentioned document creation apparatuses, connected or not connected to a network are inaccessible by an unspecified person using a password or the like. However, a shared terminal device such as a word processor or a personal computer can arbitrarily view or print information stored in the storage device unless a special process is performed. In addition, even if information processing devices connected by a network are processed so that information stored in the storage device cannot be accessed by anyone other than a specific person, anyone in the company can view the information. I do not know if it is. Therefore, it is necessary not to leave the confidential document in the storage device of the information processing device. However, a confidential document that needs to be transmitted via a network may be read by another person unless the other party immediately stores and saves it on a floppy disk or the like. In order to prevent such a case, it becomes necessary to encrypt a confidential document. Encryption in an information processing apparatus requires a program that requires complicated processing.

[0005]

With the spread of personal computers, the age at which e-mail is sent is reduced, and a single personal computer can be used together by a single family, or a plurality of personal computers can sign a contract with one provider. There are cases. At work,
A LAN (local area network) using a personal computer is provided. In such a situation, a plurality of persons may share data. In such a case, the data in the storage device needs to be made visible to all.

However, when a large number of people share data, some documents which want to transmit information only to a specific person but do not want to be seen by other people appear. Or, only a specific person may want to share data. On the Internet, there is a case where it is desired to provide information only to a person who makes a specific contract. In such a case, even if the document is stored in a shared information processing device or an information processing device via a network by encrypting, the document can be read by an unspecified person unless the code can be decrypted. Can not. However, encrypting or decrypting a document requires complicated processing, and requires dedicated software for that purpose.

[0007] The present invention provides an encrypted file that can be encrypted and decrypted with simple software by a document that is not of a degree of confidentiality and that you do not want to see or want to see. File creation method to create or decrypt, file creation device to create or decrypt encrypted file, storage medium with built-in program to create or decrypt encrypted file, create encrypted file Another object is to provide an information processing apparatus that processes information by a program for decrypting the information, and an information processing system that processes information by a program for creating or decrypting the encrypted file.

According to the present invention, in the case of sending a document by playfulness, even if an unspecified person can open the file, an encrypted file is created so that only a specific one cannot be understood as a sentence. Or a file creation method for decrypting, a file creation device for creating or decrypting an encrypted file, a storage medium incorporating a program for creating or decrypting an encrypted file,
An information processing apparatus that processes information by a program for creating or decrypting an encrypted file, and an information processing system that processes information by a program for creating or decrypting an encrypted file. And

[0009]

According to a first aspect of the present invention, there is provided a file creation method for creating or decrypting an encrypted file, wherein an arbitrary number is added or subtracted to a number which becomes a character code assigned to a character. A file or a part of a file is encrypted or decrypted as a character having a character code corresponding to the number of subtraction results.

(Second Invention) A file creation method for creating or decrypting an encrypted file according to the second invention is a method for creating a file by inputting a character by an input means, and a character code of each character in the file. A file consisting of encrypted characters by adding or subtracting an arbitrarily selected number to the file, transmitting the encrypted file by the transmitting means, and receiving the character code of the encrypted file received via the network. Is converted into a character code obtained by subtracting or adding the above-mentioned number, and a file composed of characters based on the converted character code is displayed or printed to obtain an original file.

(Third invention) A file creation method for creating or decrypting an encrypted file according to the third invention is to create a file by inputting a character with an input means, and to convert a character code of each character in the file into a character code. An arbitrarily selected number is added or subtracted to form a file composed of encrypted characters, the encrypted file is stored and stored in a storage unit, and the encrypted file stored in the storage unit is stored. When displaying or printing a file, it is converted to a character code obtained by subtracting or adding the above number, and a file consisting of characters based on the converted character code is displayed or printed to be an original file. I do.

(Fourth invention) In the file creation method for creating or decrypting an encrypted file according to the fourth invention, the arbitrarily selected number, when added to the character code, is smaller than the digit of the character code. Features.

(Fifth invention) In a file creation method for creating or decrypting an encrypted file according to a fifth invention,
As a result of adding or subtracting an arbitrarily selected number to the character code of each character in the above file, if there is no character corresponding to the obtained number of character codes, display or printing is
It is characterized by being converted into a predetermined character, symbol or figure.

(Sixth invention) In the file creation method for creating or decrypting an encrypted file according to the sixth invention,
Characters, symbols, or figures can be arbitrarily selected.

(Seventh invention) In a file creation method for creating or decrypting an encrypted file according to the seventh invention,
The arbitrarily selected number is not displayed on the display screen or stored in the storage means.

(Eighth invention) In the file creation method for creating or decrypting an encrypted file according to the eighth invention,
The arbitrarily selected number is characterized in that it disappears after being displayed on the display screen for a predetermined time or after processing the encrypted file, depending on the selection.

(Ninth invention) In a file creation method for creating or decrypting an encrypted file according to a ninth invention,
The arbitrarily selected number is converted by inputting a word other than a number.

(Tenth invention) In the file creation method for creating or decrypting an encrypted file according to the tenth invention, the arbitrarily selected number is a random number table or a cipher table, and each character is a random number table or a cipher table. Each file is encrypted based on the table, and the files are decrypted in the same order using the same random number table or cipher table.

(Eleventh invention) In the file creation method for creating or decrypting an encrypted file according to the eleventh invention, the character code is constituted by other than decimal system.

(Twelfth invention) In the file creation method for creating or decrypting an encrypted file according to the twelfth invention, the file encryption is characterized in that processing for designating only a part of a sentence can be performed.

(Thirteenth Invention) A file creation device for creating or decrypting an encrypted file according to the thirteenth invention is provided by an information processing apparatus comprising at least an input / output device, a character storage device, and a transmission / reception device. A character code generator 113 for generating a character code corresponding to the character input by the input device 111; an addition / subtraction device 114 for adding or subtracting an arbitrarily selected number to or from the character code; and an addition / subtraction device 114 Transmitting apparatus 120 for transmitting the character code added or subtracted by the above, receiving apparatus 122 for receiving the transmitted character code, and addition / subtraction apparatus for subtracting or adding the number to the character code received by the receiving apparatus 122 114 and the character code added or subtracted by the addition / subtraction device 114. Reads character data from the storage unit 115, temporarily stores a buffer memory 116
And characterized in that:

(Fourteenth Invention) A file creation device for creating or decrypting an encrypted file according to the fourteenth invention comprises an information processing device comprising at least an input / output device and a character storage device. A character code generator 113 for generating a character code corresponding to the character input by the device 111; an addition / subtraction device 114 for adding or subtracting an arbitrarily selected number to or from the character code to encrypt or decrypt the character code; A storage device 121 that stores the character codes that have been added or subtracted by the addition / subtraction device 114 and that has been encrypted, and an output device 117 that converts the encrypted or decrypted character codes into character data and displays or prints them. It is characterized by including.

(Fifteenth Invention) In the file creation apparatus for creating or decrypting an encrypted file according to the fifteenth invention, the adder / subtractor 114 can calculate the same digit as the character code.

(Sixteenth Invention) A file creation apparatus for creating or decrypting an encrypted file according to a sixteenth invention provides a character code obtained by adding or subtracting an arbitrarily selected number to or from a character code of each character in the file. In the case where there is no corresponding character, a storage device is provided which stores at least one character, symbol, or figure which is determined or registered in advance.

(Seventeenth invention) In the file creation apparatus for creating or decrypting an encrypted file according to the seventeenth invention, it is preferable that the arbitrarily selected number is not displayed on the display screen or stored in the storage means. Features.

(Eighteenth Invention) A file creation apparatus for creating or decrypting an encrypted file according to the eighteenth invention is characterized in that it has a conversion circuit for converting words other than numbers into numbers.

(Nineteenth Invention) A file creation apparatus for creating or decrypting an encrypted file according to the nineteenth invention comprises a random number table or an encryption table storage device, and each character is encrypted based on a random number table or an encryption table. And a control circuit for decrypting files in the same order using the same random number table or cipher table.

(20th invention) A storage medium according to the 20th invention is
A program for creating or decrypting an encrypted file is built in.

(Twenty-first invention) The information processing apparatus of the twenty-first invention is characterized in that information is processed by a program for creating or decrypting an encrypted file.

(22nd invention) The information processing system of the 22nd invention is characterized in that information is processed by a program for creating or decrypting an encrypted file.

(23rd Invention) The information processing system according to the 23rd invention is a system in which only a specific person creates or decrypts an encrypted file on a network open to an unspecified person by using a program. Processing.

[0032]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Invention) The present applicant has paid attention to the fact that characters are assigned by character codes. The character code assigned to the character is composed of a four-digit number in the case of a JIS Kuten code. The first invention adds or subtracts an arbitrary four-digit number, preferably a three-digit number, to the number of character codes, and uses the resulting number as a new character code. In the first invention, since an arbitrary number is added or subtracted from a predetermined character code,
Even if it is displayed as characters, the meaning of the file is unknown and it means that the file has been encrypted. When the file encrypted in this way is decrypted, the above-mentioned arbitrary number is subtracted or added to become the original character, so that the contents can be understood. According to the first invention, for example, an encrypted file can be created or decrypted by a simple method of adding or subtracting a three-digit number to or from a character code.

(Second Invention) A second invention is a processing method for encrypting or decrypting a file that is not desired to be read by an unspecified person when transmitting or receiving the file, such as an e-mail. It is. According to the second invention, first, a file is created by inputting characters by the input means. When a character is input by the input means, a character code is generated and a file is created. The character code for each character in the file is added or subtracted by an arbitrarily selected number, and becomes a file composed of encrypted characters. The encrypted file is transmitted by the transmission means and received by the receiving device via the network. The character code of the received encrypted file, when the same number is subtracted or added,
Converted to the original character code. The converted character code is output to a display device or a printing device as a character pattern of the character stored in the character storage device, and can be used as an original file.

(Third invention) A third invention is a method for encrypting or decrypting a file when one information processing device is shared by a plurality of persons. A file is created by inputting characters by the input means. When a character is input by the input means, a character code is generated and a file is created. The character code for each character in the file is added or subtracted by an arbitrarily selected number, and becomes a file composed of encrypted characters. The file is stored by being stored in the storage device. The decryption of the file is converted into a character code obtained by subtracting or adding the arbitrary number. The converted character code is decoded by extracting the original character pattern from the character storage device.

(Fourth Invention) The fourth invention relates to an arbitrarily selected number to be added to or subtracted from a character code. The arbitrarily selected number may be a four-digit number because, for example, when a JIS Kuten code is used, four digits are used. However, when the number of four digits increases, the number of additions becomes five digits. In the case of subtraction, there is a possibility that the value will be negative. Therefore, it is desirable that the selected number be one digit less than the character code digit. In other words, the JIS Kuten code has no characters assigned to the 9000s.
Regardless of which number is selected, addition is possible, but in the case of subtraction, a three-digit one is created, and there is no corresponding character.

(Fifth invention) In the fifth invention, in the fourth invention, measures are taken when a character is not assigned to a number corresponding to a character code. That is, the fifth invention is
This is a solution in a case where there is no character corresponding to the obtained number of character codes as a result of adding or subtracting an arbitrarily selected number to or from the character code of each character in the file. If there is no character corresponding to the number added or subtracted from the selected arbitrary character, the display or print is converted into a predetermined character, symbol, or figure. At first glance, it is unknown whether the encrypted file is a character obtained as a result of adding an arbitrary number or a predetermined character because no character is assigned to the character code It is. These predetermined characters are only for display or printing, and have their respective codes, so that they can be used as original characters at the time of decoding.

(Sixth Invention) The sixth invention is a case where no character is assigned to the encrypted character code. In the fifth invention, when a character is not assigned to a character code, a predetermined character is used. However, a character, a symbol, or a graphic can be obtained by arbitrarily selecting these characters. The display or printing may be anything as long as it is determined in advance. If a number is stored as a character code, the original character can be restored by adding or subtracting the same number as when it was encrypted.

(Seventh invention) A seventh invention prevents an arbitrary number selected for encryption from being displayed on the display screen or stored in the storage means. In the case where one information processing apparatus is shared by a plurality of persons, encryption is meaningless if the arbitrary number is stored in some form.

(Eighth invention) The number that can be arbitrarily selected is as follows:
It has the advantage that it can be changed at any time, rather than a specific number, but you cannot forget the number before telling the other party the number that can be decoded. Therefore, in the eighth invention, after the arbitrarily selected number is displayed on the display screen, it disappears after a predetermined time or after processing the encrypted file.

(Ninth Invention) A ninth invention is intended to prevent an encrypted file from being decrypted if the number arbitrarily selected is forgotten. The ninth invention is
When a word other than a number is entered, it is automatically converted to a number, so the code is decrypted by storing the above-mentioned non-number words in a specific place that no one can understand I don't know if it's a key.

(Tenth Invention) A tenth invention is to further enhance the encryption. The arbitrarily selected number to encrypt uses a random number table or a cryptographic table.
When the encryption is performed using the random number table or the encryption table, the decryption of the file also needs to be processed in the same order using the same random number table or the encryption table.

(Eleventh Invention) In the eleventh invention, the character code does not need to use the decimal system unlike the JIS Kuten code. For example, it may be constituted by a binary system, a hexadecimal system, or another system.

(Twelfth Invention) According to a twelfth invention, all or a part of a file can be encrypted. By encrypting only part of the file, unspecified people can understand most of the file,
The important part cannot be understood, and the desire to know that part comes up.

(Thirteenth Invention) A thirteenth invention is a file creating device comprising an information processing device comprising at least an input / output device, a character storage device, and a transmission / reception device. The character code generator generates a character code corresponding to a character input by an input device such as a keyboard. The addition / subtraction device adds or subtracts an arbitrarily selected number to or from the character code input by the input.
The character code added or subtracted by the addition / subtraction device is transmitted by the transmission device and then received by the reception device. The character code received by the receiving device is subtracted or added by the adding / subtracting device, in contrast to the encryption process. The character code added or subtracted (encrypted or decrypted) by the addition / subtraction device is read from a character storage device and stored in a buffer memory for temporarily storing the character data. afterwards,
The character data stored in the buffer memory is output to an output device.

(Fourteenth Invention) A fourteenth invention relates to a case where an encrypted file is stored in a storage device of an information processing apparatus, and has no transmission / reception apparatus according to the thirteenth invention.

(Fifteenth Invention) The processing capability of the addition / subtraction device according to the fifteenth invention is characterized in that the same digit as the character code can be calculated. The actual processing power may be an order of magnitude less.

(Sixteenth Invention) A file creation apparatus for creating or decrypting an encrypted file according to the sixteenth invention performs an encryption process when a character corresponding to the number obtained is not assigned. It is something to deal with. If there is no corresponding character, the storage device stores at least one character, symbol, or figure that is predetermined or registered in advance. In such a case, a character, a symbol, or a figure stored in the storage device is temporarily assigned.

(Seventeenth Invention) A file creation apparatus for creating or decrypting an encrypted file according to the seventeenth invention is for preventing an arbitrarily selected number from being stored in a display or storage means. In this way, it is prevented that the encrypted file is easily decrypted.

(Eighteenth Invention) The file creation apparatus for creating or decrypting an encrypted file according to the eighteenth invention is performed by inputting a word or the like instead of a number for performing an encryption process. The above-mentioned predetermined words, etc.
It is converted to a number by a conversion circuit. Since words and the like are keys for encryption or decryption, they can be hidden in sentences so that no one notices them.

(Nineteenth Invention) In a file creation apparatus for creating or decrypting an encrypted file according to the nineteenth invention, a random number table or an encryption table is stored in a storage device in advance. In encrypting or decrypting a file, each character in the file is processed based on a random number table or a cipher table. This process is more sophisticated than simply adding or subtracting numbers. Further, the random number or the cipher table can be changed for each character of the file or for each predetermined number.

(Twentieth invention) In a twentieth invention, a method of encrypting or decrypting a file according to the first invention to the third invention is stored as a program in a storage medium. As this storage medium, any one of commonly used storage media can be used.

(Twenty-first invention) In a twenty-first invention, a file creation method for creating or decrypting an encrypted file according to the first invention to the third invention is incorporated in an information processing apparatus.

(Twenty-second invention) A twenty-second invention is an information processing system in which an information processing apparatus having a file creation method for creating or decrypting an encrypted file according to the first invention to the third invention is connected via a network. It is.

(Twenty-third invention) According to a twenty-third invention, only a specific person can create or decrypt the encrypted file of the first to third inventions on a network open to an unspecified person. It is an information processing system that can.

[0055]

FIG. 1 is a block diagram showing an outline of an information processing apparatus for creating a document or the like according to a first embodiment of the present invention. In FIG. 1, the information processing apparatus includes a sentence,
A keyboard 111 for creating a file or the like including symbols and graphics, or performing input for instructing encryption or decryption
And a discrimination circuit 112 for discriminating whether it is a text, a symbol, a graphic, or the like, or whether it is encrypted or decrypted
An address generation circuit 113 for determining a character input by the keyboard 111 to generate a character code; an arithmetic circuit 114 for adding or subtracting an arbitrary number to or from the character code as necessary; A character storage device 115 in which a pattern is stored, a first buffer memory 116 for temporarily storing a sentence or the like based on the character pattern in the character storage device 115, and an output device 117 for displaying or printing a file or the like. A file storage device 118 for storing the encrypted file, a second buffer memory 119 for storing an arbitrary number to be encrypted when the instruction to encrypt the text is instructed by the keyboard 111, and the first buffer Memory 1
Transmitting device 120 for transmitting the file stored in 16
And an encrypted file storage device 121 for storing the encrypted file stored in the first buffer memory 116, and a file transmitted from another information processing device connected to the network. Receiving device 1
22 and a control circuit 123 for controlling each of these blocks.
It is composed of In the above information processing apparatus, only a part related to the present invention is shown in a normal information processing apparatus. Further, the number of storage devices or memories may be one or more. Further, the control circuit 123 controls each circuit, a memory, and the like, but does not include a control line.

FIG. 2 is a flowchart for creating a normal or encrypted file in the first embodiment of the present invention. In FIG. 1 and FIG. 2, a file and the presence or absence of encryption are input using the keyboard 111 (step 211). The determination circuit 112 checks in cooperation with the control circuit 123 whether or not there is an instruction for an encryption process for the file input by the keyboard 111 (step 212).

When the control circuit 123 determines in the determination circuit 112 that there is no instruction for the encryption processing, the address generation circuit 113 generates a character code for the character input by the keyboard 111 (step 21).
3). The control circuit 123 controls the character storage device 11 based on the character code generated by the address generation circuit 113.
5 is stored in the character storage device 11.
5 to the first buffer memory 116 (step 214).

The characters stored in the first buffer memory 116 are sequentially displayed on a display device under the control of a display control device (not shown) to form a document (step 215). The control circuit 123 checks whether there is an instruction to store the created document as a file (step 216). If there is an instruction to store a file, the control circuit 123 causes the file storage device 118 to store the file (step 217). If there is no instruction to store the file in the above step, the control circuit 123 checks whether there is an instruction to transmit the file (step 218). When determining that there is an instruction to transmit the file, the control circuit 123 transmits the file as a normal file by the transmission device 120 (step 219). That's it for creating a normal document,
This is the route for sending.

Next, in step 212, when the discriminating circuit 112 determines that the input file is instructed to be encrypted, the control circuit 123 selects an arbitrary selected file for performing the encryption process. Checks if a number has been entered. Then, the control circuit 123 temporarily stores the selected number in the second buffer memory 119 (Step 220). The control circuit 123 includes the determination circuit 11
If it is determined by step 2 that the selected arbitrary number for performing the encryption process has not been input, a message prompting the user to input the selected arbitrary number for encryption is displayed on the display device (step S2). 221). Control circuit 123
When the determination circuit 112 determines that the number of encryption processes has been input, the character code corresponding to the character input by the keyboard 111 is output to the address generation circuit 1.
13 (step 222).

The arithmetic circuit 114 adds or subtracts the selected selected number to or from the character code (step 223). The control circuit 123 causes the character pattern of the character code corresponding to the added or subtracted number to be transferred from the character storage device 115 to the first buffer memory 116 (step 224). The control circuit 123 checks whether there is an instruction to transmit the encrypted file (step 218). When the control circuit 123 determines that there is an instruction to transmit a file, the control circuit 123 transmits the encrypted file by the transmission device 120 (step 219). If there is no instruction to transmit the encrypted file in the above step, the control circuit 123 stores the encrypted file in the encrypted file storage device 121 (step 225). The above is the case where an encrypted file is created and then transmitted or stored.

FIG. 3 is a flowchart for decrypting an encrypted file according to an embodiment of the present invention. In addition,
The connection is made at (a) and (a) in FIG.
1 and 3, the receiving device 122 receives a file via a network (step 31).
1). The file is temporarily stored in a buffer memory (not shown in FIG. 1) provided in the receiving device 122 (step 312). The control circuit 123 checks whether or not the file stored in the buffer memory has been encrypted (step 313). When the control circuit 123 determines that the file is not encrypted, for example, it causes the display device to display the file as it is (step 314).

The control circuit 123 checks whether there is an instruction to store the file (step 31).
5). When the control circuit 123 determines that there is an instruction to store the file, the control circuit 123 stores the file in a predetermined storage device (step 316). Control circuit 12
3. If there is no instruction to store the file,
It is displayed on the display device (step 314). The person who reads the encrypted file inputs an arbitrary number selected from the keyboard 111 for decrypting the encrypted file, that is, the same number as the number added or subtracted by the person who performed the encryption (step). 317). The control circuit 123
If it is determined in step 313 that the received file is an encrypted file, it is checked whether a predetermined number has been input from the keyboard 111 (step 318).

When the control circuit 123 determines that a predetermined number for decrypting the encrypted file has been input, the control circuit 123 adds or subtracts the predetermined number to the character code stored in the buffer memory. The file is decrypted by causing the arithmetic circuit 114 to perform a process for subtraction (step 320). The control circuit 123 checks whether or not to display the decrypted file on a display device (step 3).
21). If the control circuit 123 determines that there is no instruction to display the decrypted file, it stores the decrypted file (step 316). Control circuit 123
If it is determined that the decrypted file is to be displayed, after displaying the file, the file is returned to the original state and it is checked whether or not the file is encrypted (step 322). If the control circuit 123 determines that there is an instruction to display the decrypted file and an instruction not to restore the original file, the control circuit 123 displays the file on the display device (step 314).

If the control circuit 123 determines that there is an instruction to return to the encrypted file after displaying the decrypted file, the arithmetic circuit 114 performs a process opposite to the decryption process (step 323). ). The file encrypted again by the arithmetic circuit 114 is filed as an encrypted file (step 324). The encrypted file can be stored on the keyboard 11 if necessary.
The number determined from 1 is input and added or subtracted by the arithmetic circuit 114 to be decoded and displayed by the display device.

In step 318, if the determined number is different, the display device does not become the document intended by the sender with different characters displayed. The recipient of the file
You need to ask the sender a number and enter it again. The above numbers can also be sent or sent as another cipher from the creator. In addition, since the transmission or the creator may create a long file and forget when the file is completed, the file may be stored until the file is completed or only for a short period of time. Alternatively, the number may be converted into a character string that only the transmission or creator can understand, and may be stored in a file so that it cannot be understood by others.

FIG. 4 shows an embodiment of the present invention in which a three-digit number is added to a character code and encrypted. FIG. 5 shows an embodiment in which one digit number is added to a character code and encrypted. FIG. 6 shows an embodiment in which a two-digit number is added to a character code and encrypted. FIG. 7 shows an embodiment in which a random number is added to a character code and encrypted. FIGS. 4 to 7 show J as character codes.
This is an example using an IS-ku code. In FIG. 4, it is assumed that the input character string is “Patent Office”. "Special"
The JIS ward code is 3835, the "permit" is the JIS ward code of 2186, and the "agency" is the JIS ward code of 360.
3. Then, assuming that the selected number is 300, the encrypted code becomes the number shown in FIG. And the character corresponding to the encrypted code is
"Second" will not be interpreted from such a character string as "patent office".

In FIG. 5, it is assumed that "September 8" is input. It is assumed that “5” selected for the JIS Kuten code is added to each character. The encrypted code is
"0330", "2383", "0329", "389
7 ". However, the encrypted code "033
No corresponding characters are assigned to “0”, “0329”, and “3897”. Therefore, when a character corresponding to the encrypted code is not assigned, for example, ● is designated. In this manner, the character string after the encryption is “September 8” becomes “● / ●●”.
In this case, what is displayed is a character string with ●, but the codes actually sent are “0330” and “238”.
Since they are "3", "0329", and "3897", they are returned to the character string "September 8" by subtracting 5 when decoding.

In FIG. 6, the input character string "Asahi" is transmitted or stored as a JIS Kuten code to which the selected 45 is added. The encrypted character of "a" is "ha" and the encrypted character of "sa" is "mo". Then, a character corresponding to the encrypted JIS Kuten code of the character "" is not assigned. Therefore, as shown in FIG. 5, the characters are converted into specific characters instead of symbols such as ●. The example in FIG.
If there is no character assigned to the JIS Kuten code,
It is determined in advance so that the character is replaced with the character "Toku".
In this way, the encryption becomes more sophisticated and difficult to decipher.

In FIG. 7, the input character string “peace treaty” is a three-digit random number “442”, “355”,
“537” and “872” are transmitted or stored as a JIS Ku-point code to which are added. In this case, the encrypted character of “hira” is “reward”, the encrypted character of “wa” is “ham”, and the encrypted character of “jo” is “butterfly”. ", And the encrypted characters" about "
It is "shuru". “Reian butterfly” is not a character string that ordinary people can read and understand. In addition, the encryption in FIG. 7 is almost impossible to decipher because the number to be added or subtracted differs for each character. However, when decrypting the above string,
The above random number table is required. The creator of the file makes the management of the random number table strict, so that even if a plurality of information processing apparatuses are shared, it cannot be decrypted by anyone other than a specific person.

FIG. 8 is a block diagram showing an outline of an information processing apparatus for creating a file or the like according to a second embodiment of the present invention. 8 differs from the first embodiment in that a number / symbol setting circuit 819 for setting and storing numbers and symbols, and a random number or cipher table storage device 820 are provided. For example, the JIS ward code is
Starting with "0101", after a symbol, after a number, after an alphabet, after a hiragana character, after a kana character, ...
-Characters are not assigned to some of the "8000" and "9000" units.

According to the present invention, when an arbitrary number is added or subtracted and the result becomes a number to which no character is assigned, as shown in FIGS. 5 and 6, an alternative character or symbol is automatically added. To be displayed or printed together with other characters. Also, the present invention
A method of adding or subtracting an arbitrary number to or from a character code simplifies encryption by a computer, so that it can be easily decrypted by a computer. In order to prevent this, using a random number or a cipher table (consisting of numbers), the number is changed for each character, for each phrase, or for each fixed number of characters, making it difficult to decipher the code. . 4 to 7 are described using the four-digit JIS Kuten code, but are not necessarily limited to the above numbers. For example, the numbers for encryption include binary, hexadecimal, and other methods.

FIG. 9 is a flow chart for explaining a process in the case where no character is assigned to a corresponding number in encryption in the embodiment of the present invention. The flowchart shown in FIG. 9 differs from step 223 in FIG. 2 onward. In step 923 shown in FIG.
4 performs a process for adding or subtracting an arbitrary number selected from the number of character codes generated by the address generation circuit 813. The control circuit 125 checks whether there is a character corresponding to the character code consisting of the number of results calculated by the calculation circuit 814 (step 924). If the control circuit 125 determines that the character pattern corresponding to the character code obtained by calculation is in the character storage device 815, the control circuit 125 transfers the character to the first buffer memory 816 (step 925).

When the control circuit 125 determines that the character pattern corresponding to the character code obtained by the calculation is not in the character storage device 815, the control circuit 125 converts the character pattern into a preset code such as a character, a symbol, or a figure ( Step 927).
The control circuit 125 selects a character or a symbol corresponding to the code from the character storage device and
16 (step 925). After that, the control circuit 125 creates a file in which the encrypted characters and the non-encrypted characters are mixed (Step 926).
As described above, in the encrypted file, it is not easy to determine which character is encrypted, or because there is no corresponding character, it is an assigned character. The control circuit 125 checks whether or not to transmit the encrypted file (step 918).

If the control circuit 125 determines that the encrypted file is to be transmitted, it transmits the encrypted file (step 919). When the control circuit 125 determines not to transmit the encrypted file,
The encrypted file is stored in a storage device (not shown) (step 928). The preset characters, symbols, figures, and the like can be changed to arbitrary ones each time. In this case, the above characters, symbols,
A figure or the like has nothing to do with character data and needs to be able to return to the original number by addition or subtraction. Other processes are the same as those in FIG.

FIG. 10 is a flow chart for explaining a process for further complicating the encryption according to the third embodiment of the present invention. The flowchart shown in FIG. 10 differs from step 920 in FIG. 9 onward. In step 1020 shown in FIG. 10, a process for setting the random number or encryption table storage device 820 (see FIG. 8) storing the random number table or encryption table in the number / symbol setting circuit 819 is performed by a keyboard or the like ( Step 1020). When the discriminating circuit 812 determines that there is an instruction for the encryption process, the control circuit 125 checks whether a random number or a cipher table is set in the number / symbol setting circuit 819 (step 1021). In FIG. 8, the number / symbol setting circuit 819 can also be used as the second buffer memory 821. The control circuit 125 uses the determination circuit 812 to
When it is determined that the random number or the encryption table for performing the encryption process is not input, a message prompting the user to input the random number or the encryption table for encryption to the number / symbol setting circuit 819 is displayed on the display device ( Step 1022).

When the control circuit 125 determines that the random number or the code table is set in the number / symbol setting circuit 819, the character code input by the keyboard is generated by the address generation circuit 813 (step 1023). The control circuit 125 causes the arithmetic circuit 814 to add or subtract the random number or the number of the cipher table to the character code as the address. The addition or subtraction includes a method of simply repeating the same number of random numbers or cipher tables, a method of changing the number of random numbers or cipher tables by several characters, and a method of changing the number of random numbers or cipher tables for each character (step 1024). ). These processes can be performed in advance by a program, a sequence circuit, or the like.

The control circuit 125 transfers the characters corresponding to the number obtained by the above-mentioned encryption processing from the character storage device 815 and stores them in the first buffer memory 816 (step 1025). The control circuit 125 checks whether the file has the next character to be encrypted (step 102).
6). When the control circuit 125 determines that the file has characters to be encrypted, the process returns to step 1024 and performs encryption processing (step 1027). Control circuit 125
Determines that the file has no characters to encrypt,
The encryption processing is stopped, and it is checked whether or not to transmit the file (step 1018). If the control circuit 125 determines to transmit the file, the control circuit 125 transmits the encrypted file or a partially encrypted file (step 1).
019). If the control circuit 125 determines that the file is not to be transmitted, the encrypted file or the partially encrypted file is stored in the encrypted file storage device 823.
(Step 1028).

FIG. 11 is a diagram for explaining a case of decrypting an encrypted file according to the third embodiment of the present invention. In FIG. 11, (b) and (b) are connected. 11 differs from FIG. 3 in that:
Use a random number or a cipher table instead of any selected number to add or subtract to decrypt the cipher, and temporarily store the received file in the buffer memory and the file stored in the buffer memory Is to be decrypted. That is, step 1112 stores the received file in the buffer memory. Also,
A step 1119 checks whether or not there is a random number or a cipher table at the time of encryption. Further, step 1121 includes:
The control circuit 125 checks whether or not the encrypted characters are still left in the buffer memory.

FIG. 12 is a view for explaining a case in which all or part of a file is encrypted in the fourth embodiment of the present invention. FIG. 12 differs from FIG. 9 in that all or part of a file can be encrypted. That is, the control circuit 12
5 checks in step 1220 whether an instruction to encrypt the entire file has been issued. In step 1227, the control circuit 125 checks whether or not an instruction to encrypt a part of the file has been issued. Then, the control circuit 125 determines in step 12
At 30, some characters that encrypt the file are retrieved. Subsequent processing is the same as in FIG. Processing for decrypting all or a part of the file can be substantially the same.

The number to be added or subtracted at the time of encryption, the random number, and the encryption table (number) are stored in a folder that cannot be accessed by anyone other than the person who created the encrypted file, or after a predetermined time has elapsed after notifying the other party. Processing such as automatic disappearance can be performed. The above numbers can be changed to words or letters so that they can be stored. That is, in such a method, encryption is performed twice, which is more sophisticated.

The present embodiment has been described in detail above.
It is not limited to the above embodiment. Various design changes can be made without departing from the present invention described in the appended claims. In the information processing apparatus described in this embodiment, only a part necessary for encryption or decryption is described, and the other part may be a known or well-known circuit or device. Further, since the blocks in the present embodiment can be achieved by a known or well-known technique, a detailed description is omitted. Further, the present embodiment can be arbitrarily combined. In this embodiment, when an unspecified number of persons access the Internet, it is possible to prevent an important part from being seen by anyone other than the contractor.

[0082]

According to the present invention, a file can be encrypted or decrypted by a simple process of adding or subtracting an arbitrary number selected to a character code.
According to the present invention, by encrypting only a part of a file, it is possible to increase a desire to view the contents of the file. According to the present invention, a file can be easily encrypted or decrypted, so that a sentence that is not desired to be seen by a person can be transmitted and received with a sense of play.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an outline of an information processing apparatus that creates a document or the like in a first embodiment of the present invention.

FIG. 2 is a flowchart for creating a normal or encrypted file in the first embodiment of the present invention.

FIG. 3 is a flowchart for decrypting an encrypted file according to an embodiment of the present invention.

FIG. 4 is an example in which a three-digit number is added to a character code and encrypted in one embodiment of the present invention.

FIG. 5 is an example in which one digit number is added to a character code and encrypted in one embodiment of the present invention.

FIG. 6 is an example in which a two-digit number is added to a character code and encrypted in one embodiment of the present invention.

FIG. 7 is an example in which a random number is added to a character code and encrypted in an embodiment of the present invention.

FIG. 8 is a block diagram illustrating an outline of an information processing apparatus that creates a file or the like in a second embodiment of the present invention.

FIG. 9 is a flowchart illustrating a process in the case where characters are not assigned to corresponding numbers during encryption in the embodiment of the present invention.

FIG. 10 is a flowchart for explaining processing for further complicating encryption in the third embodiment of the present invention.

FIG. 11 is a diagram for explaining a case of decrypting an encrypted file in a third embodiment of the present invention.

FIG. 12 is a diagram for explaining a case in which all or part of a file is encrypted in a fourth embodiment of the present invention.

FIG. 13 is a schematic block configuration diagram for explaining a document creation device in a conventional example.

FIG. 14 is a flowchart for explaining the operation of the document creation apparatus shown in FIG.

[Explanation of symbols]

 111 ... keyboard 112 ... discrimination circuit 113 ... address generation circuit 114 ... arithmetic circuit 115 ... character storage device 116 ... first buffer memory 117 ... output device 118 ... file Storage device 119: second buffer memory 120: transmission device 121: encrypted file storage device 122: reception device 123: control circuit

 ──────────────────────────────────────────────────続 き Continuation of front page (54) [Title of Invention] File creation method for creating or decrypting an encrypted file, file creation device for creating or decrypting an encrypted file, encrypted file Storage medium that has a program for creating or decrypting an encrypted file, an information processing device that processes information using the program for creating or decrypting an encrypted file, and a device that creates or decrypts an encrypted file. Information processing system that processes information using a program for decryption

Claims (23)

[Claims] 1. A method of encrypting or decrypting a file or a part of a file as a character having a character code corresponding to the number obtained by adding or subtracting an arbitrary number to or from a character code assigned to a character. A file creation method that creates or decrypts an encrypted file that features. 2. A file is created by inputting characters by an input means, and a file consisting of encrypted characters is obtained by adding or subtracting an arbitrarily selected number to or from a character code of each character in the file, The encrypted file is transmitted by the transmitting means, and converted into a character code obtained by subtracting or adding the above number from the character code of the encrypted file received via the network, and based on the converted character code. A file creation method for creating or decrypting an encrypted file, characterized by displaying or printing a file consisting of characters in the form of an original file. 3. A file is created by inputting characters by an input means, and a file consisting of encrypted characters is obtained by adding or subtracting an arbitrarily selected number to or from a character code of each character in the file. When the encrypted file is stored and stored in the storage means, and when the encrypted file stored in the storage means is displayed or printed, it is converted into a character code obtained by subtracting or adding the above number, A file creation method for creating or decrypting an encrypted file, characterized in that a file consisting of characters based on the converted character code is displayed or printed as an original file. 4. The method according to claim 1, wherein the arbitrarily selected number, when added to the character code, is smaller than the digit of the character code. How to create a file to decrypt. 5. A display or print is determined in advance when there is no character corresponding to the obtained number of character codes as a result of adding or subtracting an arbitrarily selected number to the character code of each character in the file. 4. A file creation method according to claim 1, wherein the file is converted into a character, symbol, or graphic. 6. The file creation method according to claim 5, wherein said character, symbol or figure can be arbitrarily selected. 7. The method according to claim 1, wherein the arbitrarily selected number is not displayed on a display screen or stored in a storage unit. File creation method. 8. The method according to claim 1, wherein the arbitrarily selected number disappears after being displayed on a display screen, after a predetermined time, or after processing an encrypted file. 3. A file creation method for creating or decrypting the encrypted file according to 3. 9. The method according to claim 1, wherein the arbitrarily selected number is converted by inputting a word other than a number. File creation method. 10. The arbitrarily selected number is a random number table or a cipher table, and each character is encrypted based on the random number table or the cipher table, respectively, and using the same random number table or the cipher table. 4. The file creation method for creating or decrypting an encrypted file according to claim 1, wherein the files are decrypted in the same order. 11. The file creation method according to claim 1, wherein the character code is formed in a format other than decimal system. 12. The file encryption method according to claim 1, wherein only a part of a sentence can be designated.
A file creation method for creating or decrypting an encrypted file according to claim 3. 13. A file creation device comprising at least an information processing device including an input / output device, a character storage device, and a transmission / reception device, wherein a character code corresponding to a character input by the input device is generated. A character code generator, an adding / subtracting device for adding or subtracting an arbitrarily selected number to or from the character code; a transmitting device for transmitting the character code added or subtracted by the adding / subtracting device; A receiving device for receiving, an adding / subtracting device for subtracting or adding the number to the character code received by the receiving device, and reading character data from the character storage device based on the character code added or subtracted by the adding / subtracting device Together with a buffer memory for temporarily storing the encrypted data. File creating apparatus for creating or decrypt the file. 14. A file creation device comprising at least an information processing device comprising an input / output device and a character storage device, wherein a character code generation device for generating a character code corresponding to a character input by said input device. An addition / subtraction device that adds or subtracts an arbitrarily selected number to or from the character code to encrypt or decrypt; and a storage device that stores the encrypted character code added or subtracted by the addition / subtraction device. An output device for converting the encrypted or decrypted character code into character data and displaying or printing the same, and a file creation device for creating or decrypting an encrypted file. 15. The file creating apparatus according to claim 13, wherein the adding / subtracting apparatus can calculate the same digit as a character code. 16. If there is no character corresponding to a character code obtained by adding or subtracting an arbitrarily selected number to the character code of each character in the file, at least one character that is predetermined or registered in advance. 15. The file creation device for creating or decrypting an encrypted file according to claim 13, further comprising a storage device in which a file, a symbol, or a figure is stored. 17. The method according to claim 13, wherein the arbitrarily selected number is not displayed on a display screen or stored in a storage unit. File creation device. 18. The file creation apparatus for creating or decrypting an encrypted file according to claim 13, further comprising a conversion circuit for converting words other than numbers into numbers. 19. A control device for storing a random number table or a cipher table storage device, wherein each character is encrypted based on the random number table or a cipher table, and decrypting a file in the same order using the same random number table or a cipher table. 15. The file creation device according to claim 13 or claim 14, further comprising a circuit. 20. A storage medium having a program for creating or decrypting the encrypted file according to claim 1 built therein. 21. An information processing apparatus for processing information by a program for creating or decrypting an encrypted file according to claim 1. Description: 22. An information processing system for processing information by a program for creating or decrypting an encrypted file according to claim 1. Description: 23. Information for processing information by a program for creating or decrypting an encrypted file according to claim 1 on a network open to unspecified persons. Processing system.