WO2007148433A1 - Procédé de formation d'une zone de données fixes sur un support inscriptible - Google Patents

Procédé de formation d'une zone de données fixes sur un support inscriptible Download PDF

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Publication number
WO2007148433A1
WO2007148433A1 PCT/JP2007/000643 JP2007000643W WO2007148433A1 WO 2007148433 A1 WO2007148433 A1 WO 2007148433A1 JP 2007000643 W JP2007000643 W JP 2007000643W WO 2007148433 A1 WO2007148433 A1 WO 2007148433A1
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WO
WIPO (PCT)
Prior art keywords
recording medium
data
data area
fixed
area
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2007/000643
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English (en)
Japanese (ja)
Inventor
Toshiki Aoi
Yoichi Nakayama
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TDK Corp
Original Assignee
TDK Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by TDK Corp filed Critical TDK Corp
Publication of WO2007148433A1 publication Critical patent/WO2007148433A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
    • G11B7/00736—Auxiliary data, e.g. lead-in, lead-out, Power Calibration Area [PCA], Burst Cutting Area [BCA], control information
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/00094—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which result in a restriction to authorised record carriers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/00166—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which result in a restriction to authorised contents recorded on or reproduced from a record carrier, e.g. music or software
    • G11B20/00173—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which result in a restriction to authorised contents recorded on or reproduced from a record carrier, e.g. music or software wherein the origin of the content is checked, e.g. determining whether the content has originally been retrieved from a legal disc copy or another trusted source
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/0021—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/0021—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier
    • G11B20/00217—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source
    • G11B20/00253—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source wherein the key is stored on the record carrier
    • G11B20/0026—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source wherein the key is stored on the record carrier the key being stored as a barcode
    • G11B20/00268—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source wherein the key is stored on the record carrier the key being stored as a barcode said barcode being recorded in a burst cutting area [BCA]
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2537—Optical discs

Definitions

  • the present invention relates to a technique for forming a fixed data area of a writable recording medium and authenticating the recording medium using the fixed data area.
  • a writable recording medium capable of recording content while giving a limit on the number of copies. According to this recording medium, it is possible to realize recording of video and the like whose copyright is to be protected.
  • various copyright protection technologies such as the structure of this type of recording medium and the recording method for the recording medium, have been proposed. ing.
  • a writable recording medium For example, in a writable recording medium, a fixed data area that cannot be rewritten (read-only) is formed, and a unique code such as a serial number that is different for each recording medium is recorded in this fixed data area. There is something to be done.
  • the recorder uses the authenticated key code provided by the copyright protection technology management organization to record the contents of the recording medium.
  • the unique code is encrypted, and this encrypted data is recorded in the recordable area along with the content.
  • the unique code in the fixed data area and the encrypted data in the recordable area are read out, and the encrypted data is decrypted and restored. If the decrypted data matches the unique code, the content recorded with the encrypted data is judged to be a regular copy, and playback is performed.
  • a hash value or the like is generated based on the information recorded in the system side area, and this hash value is transferred to the fixed data area side. Record it.
  • the hash value recorded in the fixed data area side can be used to verify whether or not tampering has occurred. Allow use. Disclosure of the invention
  • This media manufacturer ID is an ID code assigned to each legitimate manufacturer by each standard organization. For example, in the case of DVD-R, it is written in the stamper in the form of a wobble signal when the master is manufactured. It is. Therefore, a unified media manufacturer ID is recorded on all DVD-R discs produced by the manufacturer. The recorder reads this media manufacturer ID and matches the recording characteristics of the DVD-R of the manufacturer. Select the recording / playback conditions and execute the recording / playback.
  • These media manufacturer IDs may be expressed using manufacturer's name using ASCII codes such as alphabets and numbers, or simply using binary numbers, and are usually assigned a few bytes.
  • this media manufacturer ID is defined by the standard in terms of the storage location in the fixed data area, the manufacturer of the recording medium can receive the media manufacturer ID from another company's recording medium. It was very easy to obtain fraudulently. Therefore, there has been a problem that the recording medium manufacturer mass-produces the recording medium by using the media manufacturer ID of other manufacturers without permission. Specifically, a blank recording medium pretending to be a media manufacturer of another company is mass-produced by combining the media manufacturer ID of another company and the unique data generated by itself and recording it at a fixed position in the fixed data area. There was a problem of being done.
  • the outer surface of the recording medium is given a pattern or a mouth indicating the manufacturer, and the user is identified by the appearance to prevent impersonation. It is possible to do. In this case, legal protection may be provided by the copyright of the pattern and the trademark rights of the logo.
  • the present invention has been made in view of the above problems, and is intended to provide a technique for preventing improper impersonation of a manufacturer and promoting proper use of a recording medium.
  • the present invention that achieves the above object is a method of forming the fixed data area in a writable recording medium having a read-only fixed data area, wherein the identification differs for each individual recording medium.
  • Generating basic data including information, generating encrypted data based on the basic data, and storing the basic data and the encrypted data in a non-rewritable state in the fixed data area;
  • the fixed data area forming method that achieves the above object is characterized in that, in the above invention, a serial number different for each recording medium is used as the identification information included in the basic data.
  • the fixed data area forming method that achieves the above object is characterized in that, in the above invention, the fixed data area forming method is generated using the encrypted data force hash function.
  • a fixed data area forming method that achieves the above object is characterized in that, in the above invention, the encrypted data is generated using a public key algorithm.
  • a fixed data area forming method that achieves the above object is characterized in that, in the above invention, the fixed data area forming method is generated using the encrypted data error correction code.
  • a method for forming a fixed data area that achieves the above object is as described above.
  • a media manufacturer ID that identifies a manufacturer of the recording medium is stored in the fixed data area.
  • the basic data and the encrypted data are continuously stored in a unique data area set in the fixed data area.
  • the present invention that achieves the above object is a writable recording medium in which the read-only fixed data area is formed by the fixed data area forming method described in the invention.
  • the present invention for achieving the above object is a writable recording medium having a read-only fixed data area, wherein the fixed data area includes basic data to be held in the fixed data area, And a writable recording medium in which encrypted data generated based on the basic data is stored.
  • a recording medium that achieves the above object is characterized in that, in the above-mentioned invention, the recording medium is one of a CD standard, a DV standard, an HD-DVD standard, and a Blu_rayDisc standard.
  • the present invention that achieves the above object is a device for forming the fixed data area in a writable recording medium having a read-only fixed data area, wherein the identification information differs for each individual recording medium.
  • Basic data generation means for generating basic data including: encrypted data generation means for generating encrypted data based on the basic data; and for the fixed data area, the basic data and the encryption
  • a recording medium fixed data area forming apparatus characterized by comprising: a recording means for recording data in a non-rewritable state.
  • the present invention for achieving the above object is a writable recording medium authentication method, which is a basic data capable of identifying an individual recording medium by reading a read-only fixed data area in the recording medium. And encrypted data obtained by encrypting the basic data, and generating the encrypted data for verification by encrypting the basic data by a preset encryption method, and the encrypted data for verification And whether or not the encrypted data stored in the fixed data area match. If they match, the use of the recording medium is permitted, and if they do not match, the recording medium It is a recording medium authentication method characterized by refusing use.
  • the present invention that achieves the above object is a writable recording medium authentication method, which is a basic data that can identify an individual recording medium by reading a read-only fixed data area in the recording medium. And encrypted data obtained by encrypting the basic data is extracted, and the encrypted basic data is generated by decrypting the encrypted data by a preset decryption method, and the basic data for verification and the fixed data It is determined whether or not the basic data stored in the area matches, and if they match, the use of the recording medium is permitted, and if they do not match, the use of the recording medium is rejected. This is an authentication method for the recording medium to be used.
  • a recording medium authentication method that achieves the above object is the above invention, wherein the encrypted data used in the authentication is stored in a predetermined memory means and the encrypted data of the recording medium to be newly authenticated is stored. And the encrypted data used for authentication in the past to determine whether or not the same encrypted data existed in the past.
  • the recording medium authentication method that achieves the above-described object is the above invention, wherein in the above-mentioned invention, the encrypted data that is the same as the encrypted data of the recording medium to be newly authenticated is present in the memory means more than a predetermined reference number. In this case, the use of the recording medium is rejected.
  • the present invention that achieves the above object is an authentication device for a writable recording medium, and is a basic data that can identify an individual recording medium by reading a read-only fixed data area in the recording medium. And a fixed data area reading means for extracting encrypted data obtained by encrypting the basic data, a re-encrypting means for encrypting the basic data by a preset encryption method, and a re-encrypting means. Encrypted verification data and the fixed data area
  • An authentication device for a recording medium comprising: verification means for determining whether or not the encrypted data stored in a region match.
  • the recording medium can be authenticated by the fixed data area, and it is possible to achieve an excellent effect that production of a dummy recording medium in which the fixed data area is copied can be suppressed. .
  • FIG. 1 is a block diagram showing a configuration of a fixed data area forming device according to a first embodiment of the present invention.
  • FIG. 2 is a block diagram showing a process for forming a fixed data area using the forming apparatus.
  • FIG. 3 is a block diagram showing a configuration of a recording / reproducing apparatus according to the first embodiment of the invention. Diagram showing the authentication process of the recording medium using
  • FIG. 5 is a block diagram showing a configuration of a fixed data area forming device according to a second embodiment of the present invention.
  • FIG. 6 is a block diagram showing a process for forming a fixed data area using the forming apparatus.
  • FIG. 7 is a block diagram showing a configuration of a recording / reproducing apparatus according to a second embodiment of the invention. Diagram showing the authentication process of the recording medium using
  • FIG. 9 is a block diagram showing a configuration of a recording / reproducing apparatus according to a third embodiment of the present invention.
  • FIG. 10 is a block diagram showing a recording medium authentication process using the recording / reproducing apparatus.
  • FIG. 1 shows a schematic configuration of a fixed data area forming apparatus (hereinafter referred to as a forming apparatus) 1 of a recording medium 50 according to the first embodiment of the present invention.
  • the forming apparatus 1 includes basic data generation means 10, encrypted data generation means 12, and irreversible recording means 14.
  • the basic data generating means 10 generates basic data including different identification information for each individual recording medium 50, and here, a serial number that differs for each recording medium 50 is generated as the identification information. Individual identification is possible by this serial number.
  • Encrypted data generation means 12 generates encrypted data based on a serial number serving as basic data. Here, the hash value obtained from the serial number using the hash function is used as encrypted data.
  • the irreversible recording means 14 is a so-called BCA register, and records basic data (serial number) and encrypted data (hash value) in a non-rewritable state in a fixed data area of the recording medium 50.
  • basic data serial number
  • encrypted data check value
  • the recording mode is low-density data using a barcode format.
  • the fixed data area recorded in this way is called BCA (BurstCuttinga Area), and is automatically read out before recording / reproduction of the recording medium 50.
  • the capacity of this B CA is limited and is often set within 300 bytes.
  • FIG. 2 shows a process for forming the fixed data area 60 by the forming apparatus 1.
  • the fixed data area 60 is the BCA described above, and usually consists of a basic information area 62 and a unique data area 64.
  • BCA identification information indicating that the fixed data area 60 is BCA
  • media manufacturer ID indicating the manufacturer of the recording medium 50
  • the unique data area 6 4 different information for each recording medium 50 must be recorded for the purpose of being used for copyright protection technology.
  • the number that can be identified is not infinite, if a 35-bit capacity is assigned to the unique data area 6 4, a serial number of 340.0 billion or more can be assigned, which is practically sufficient.
  • the unique data area 64 is formally divided into two areas, one of which is the basic area 6 6 and the other is the encryption area 68.
  • the basic area 66 the basic data generated by the basic data generating means 10 is recorded.
  • the encryption area 68 the encrypted data generated using the hash function 70 of the encrypted data generation means 12 is recorded. Na If the basic data is different, the encrypted data generated based on this basic data will always be different, so the entire unique data area 64 will remain unique information.
  • the BCA identification information recorded in the basic information area 62, the media manufacturer ID, and the basic data and encrypted data recorded in the unique data area 64 are temporarily stored in the data generator 1 of the irreversible recording means 14 Combined with 4 A, it becomes one BCA fixed information. Thereafter, the fixed data area 60 is formed by recording the B C A fixed information together by the recorder 14 B.
  • the type of the hash function, the internal configuration of the unique data area 64 (data position and number of bits in the encryption area 69), etc. are those other than the designer of the encryption means of the recording / playback device described later. Need to be kept secret.
  • FIG. 3 shows a recording / reproducing device 80 that performs recording / reproduction of the recording medium 1 after the authentication of the recording medium 1 is performed. That is, this recording / reproducing device 80 also serves as an authentication device for the recording medium 1.
  • the recording / reproducing device 80 includes a fixed data area reading unit 8 2, a re-encryption unit 8 4, a verification unit 8 6, and a recording / reproducing unit 90.
  • the fixed data area reading means 82 can read out the fixed data area 60 of the recording medium 50 and extract the information recorded in each area individually. Therefore, the fixed data area reading means 82 2 is preset with information on the data arrangement configuration of the fixed data area 60 (the start position and the number of bits of each area). Area 6 6 and encryption area 6 8 can also be read separately.
  • the re-encryption means 8 4 has the same function as the hash function used in the encrypted data generation means 1 2 of the forming apparatus 1, and the hash value is derived from the basic data (serial number) in the basic area 6 6 Is calculated. This hash value is used as encrypted data for verification.
  • the verification means 86 compares the encrypted data in the encryption area 68 with the encrypted data for verification encrypted by the re-encryption means 84, and if both match, it is properly authenticated. Judging and recording by recording / reproducing means 90 ⁇ Give permission for playback. If they do not match, judge that authentication is not possible and prohibit recording or playback.
  • FIG. 4 shows the authentication process of the recording / reproducing apparatus 80 in blocks.
  • the recording / reproducing device 80 reads the fixed data area 60 of the recording medium 50. Further, the recording / reproducing apparatus 80 identifies the basic information area 6 2 in the fixed data area 60, the basic area 6 6 in the unique data area 6 4 and the encryption area 6 8 and individually stores the information stored in each area. To extract. Then, based on the serial number recorded in the basic area 66, a hash value is generated using the hash function 92, and it is used as encrypted data for verification.
  • the verification means 86 compares the encrypted data (hash value) for verification with the encrypted data recorded in the encryption area 68, and authenticates if they match.
  • the use of this recording medium is stopped unless authentication using the encrypted data in the fixed data area 60 is performed. Is possible. Therefore, impersonation such as manufacturing the recording medium 50 using another media manufacturer ID is prevented.
  • a recording medium 50 manufactured by another company was obtained, the media manufacturer ID was decoded from this recording medium 50, and a fixed data area was formed by simply combining the company's serial number.
  • the recording medium 50 does not include encrypted data, the recording / reproducing apparatus 80 of this embodiment does not authenticate.
  • the encryption means used at the time of manufacture by the authorized media manufacturer corresponding to the media manufacturer ID ( Here, a specific hash function), the head position and data capacity, etc. of the encryption area 68 in the unique data area 64 set by this media manufacturer are obtained and recorded by the forming device 1 based on these conditions Medium
  • the body 50 must be manufactured. Since this information is secretly managed by the management organization and cannot be obtained, this kind of impersonation is prevented.
  • a fixed data area forming apparatus 1 0 1 according to a second embodiment of the present invention will be described.
  • this forming apparatus 1 0 the same or similar parts as those of the forming apparatus 1 of the first embodiment are omitted by matching the last two digits of the reference numerals in the drawing. The description will focus on the differences from the first embodiment.
  • This forming apparatus 101 includes a hash value generation unit 1 1 2 A and a public key algorithm generation unit 1 1 2 B as the internal configuration of the encrypted data generation unit 1 1 2.
  • Hash value generator 1 1 2 A calculates a hash value from basic data using a hash function.
  • the public key algorithm generation unit 1 1 2 B uses the public key algorithm to encrypt the hash value generated by the hash value generation unit 1 1 2 A using a secret key (electronic signature). .
  • the encrypted data generated in this way is stored in the fixed data area 160 together with other data. To be recorded.
  • FIG. 6 shows a block forming process of the fixed data area 160 by the forming apparatus 100 1.
  • the fixed data area 160 is the BCA described above, and consists of the basic information area 16 2 and the unique data area 16 4. Based on the basic data, the encrypted data generated through the encryption process 1 7 2 using the hash function 1 70 and the secret key K s is stored in the encryption area 1 6 8 in the unique data area 1 6 4. To be recorded.
  • Basic data area 1 6 2 BCA identification information, media manufacturer ID, basic data and encrypted data corresponding to unique data area 1 6 4 are irreversible recording means 1 1 4
  • Data generator 1 1 4 Combined with A, it becomes one BCA fixed information, and is recorded on the recording medium 150 by the recorder 1 14 B to form a fixed data area 160.
  • the hash function 1 7 0 used in this forming apparatus 1 0 1 does not need to be secretly set for each media manufacturer, and is shared among a plurality of media manufacturers. It is good and you can make it public.
  • the private key K s in the public key algorithm ⁇ is uniquely owned by the media manufacturer and is completely private information.
  • FIG. 7 shows a recording / reproducing apparatus that authenticates the recording medium 1 0 1 and executes recording / reproduction.
  • This recording / reproducing device 1 80 includes a fixed data area reading means 1 8 2, a hash value generation means 1 8 3, a decryption means 1 8 5, a verification means 1 8 6, and a recording / reproducing means 1 9 0 Is provided.
  • the fixed data area reading means 1 8 2 reads the fixed data area 1 60 of the recording medium 1 5 0 and extracts information from each area.
  • the hash value generation means 1 8 3 is a hash value generation unit in the forming apparatus 1 0 1
  • the decryption means 1 8 5 has a plurality of public keys K p provided by a plurality of media manufacturers, and based on the media manufacturer ID read from the fixed data area 1 6 0, So The public key K p distributed by the media manufacturer is selected, and the encrypted data recorded in the encryption area 16 8 is decrypted using this public key K p.
  • the verification unit 1 8 6 compares the hash value for verification decrypted by the decryption unit 1 85 and the hash value newly generated by the hash value generation unit 1 8 4, and if both match, Judge that it is properly authenticated, permit the use of recording medium 1 5 0, and if the two do not match, determine that authentication is impossible and prohibit the use of recording medium 1 5 0.
  • FIG. 8 shows the authentication and recording / reproducing process by the recording / reproducing apparatus 180 in a block.
  • the recording / reproducing apparatus 180 the fixed data area 160 of the recording medium 150 is read.
  • the recording / reproducing apparatus 1 80 identifies the basic information area 1 6 2 in the fixed data area 1 6 0 and the unique data area 1 6 4, and further, the basic area 1 6 6 in the unique data area 1 6 4 Identify the encryption areas 1 6 8 and extract the individual data.
  • a hash value is generated by the hash function 1 92 based on the basic data (serial number) of the basic area 1 6 6.
  • the decryption means 1 8 5 the public key K p distributed from this manufacturer is selected using the media manufacturer ID stored in the basic information area 1 6 2, and this public key ⁇ ⁇ To decrypt the encrypted data in the encryption area 1 6 8.
  • the verification means 1 8 6 compares this decrypted data with the hash value generated by the hash value generation means 1 8 3, and if they match, it is determined that the authentication is correct, and the recording medium 1 5 Allow use of 0. On the other hand, if the two do not match, it is determined that the authentication has not been performed correctly, and the use of the recording medium 15 is prohibited.
  • the decryption means 1 85 5 ⁇ a plurality of public keys are held, so that a plurality of regular media manufacturers It is possible to authenticate each of the recording media 1 5 0 manufactured by.
  • the decryption means 1 85 5 ⁇ a plurality of public keys are held, so that a plurality of regular media manufacturers It is possible to authenticate each of the recording media 1 5 0 manufactured by.
  • a hash function itself is associated with a media manufacturer ID and incorporated in a recording / reproducing apparatus in a secret state, it is possible to enable authentication of a plurality of media manufacturers. Adopted by each media manufacturer It is necessary to incorporate different hash functions in the recording / reproducing apparatus.
  • the media manufacturer can keep the secret key K s secretly, and the secret key K s can be communicated with the designer of the recording / reproducing device 1 80. It is safe because there is no need to share
  • a recording / reproducing device 2 8 0 according to a third embodiment of the present invention will be described with reference to FIG. 9 and the like.
  • this recording / reproducing apparatus 28 the same or similar parts as those of the recording / reproducing apparatus 80 shown in the first embodiment are omitted by matching the last two digits of the reference numerals.
  • the recording / reproducing device 2 80 includes a fixed data area reading means 2 8 2, re-encryption means 2 8 4, verification means 2 8 6, recording / reproduction means 2 90, encrypted data storage means 2 8 8 and encrypted data history matching means 2 8 9 are provided.
  • the encrypted data storage means 2 8 8 includes the encrypted data (N, N _ 1, N _) of the recording medium 2 5 0 used in the recording / reproducing device 2 80. 2 to N_X) are stored in the specified memory.
  • the encrypted data history matching means 2 8 9 includes the encrypted data (N + 1) of the newly authenticated recording medium 2 5 0 and the past encrypted data stored in the encrypted data storage means 2 8 8.
  • the data is collated sequentially to determine whether there is a match in the past. As a result of this determination, if there are more than 100 encrypted data that is the same as the currently read encrypted data, a large number of recording media that have illegally copied the fixed data area are distributed. The use of this recording medium 2 5 0 is prohibited by judging that a suspicion has occurred. On the other hand, if there is only less than 1 000 encrypted data identical to the encrypted data of the newly authenticated recording medium 2 5 0 in the past, it is determined that the data is still in an appropriate state. The process proceeds to the authentication process for the fixed data area 2 60 already described. Here, the existence of 100 cases is used as a reference value for non-determination, but the present invention is not limited to this and may be determined according to other criteria.
  • the recording / reproducing apparatus 2820 of the third embodiment it is possible to detect an impersonation act of mass-producing a recording medium in which a fixed data area is copied as it is. Therefore, if a media publishing company that properly copies digital contents to a blank recording medium 2500 uses this recording / reproducing device 2800, is the purchased blank recording medium appropriate? It is possible to automatically determine whether or not to use unauthorized recording media.
  • the encrypted data is shown after the basic data in the unique data area.
  • encrypted data may be placed before or in the middle of basic data.
  • the encrypted data may be divided according to a predetermined standard so that the basic data is interrupted according to a predetermined rule. This makes it more difficult for the media manufacturer to analyze the internal structure of the unique data carrier of other media manufacturers, thus reducing the unauthorized use of the fixed data area.
  • the media manufacturer Encrypted data may be generated based on data including other information such as an ID. In other words, it is sufficient if the basic data contains unique information that allows individual identification, and it is free to add other information to the basic data.
  • the basic data encryption is shown only when the hash function or the public key algorithm is used, but the present invention is not limited to this.
  • an error detection code CRC code
  • an error correction code ECC code
  • the standard of the recording medium is not particularly limited, but it can be used for, for example, the CD standard, the DVD standard, the HD-DVD standard, the Blu_ray D i sc standard, and the like.
  • a recording / reproducing device is used for authentication of a recording medium has been shown, but the present invention is not limited thereto, and can be adopted in a recording-only device or a reproducing-only device, and an authentication device Can also be used alone.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)

Abstract

L'invention concerne un procédé permettant de former une zone de données fixes sur un support inscriptible comportant une zone de données fixes non-inscriptible. Des données de base comprenant des informations d'identification variant entre des supports d'enregistrement individuels sont créées, et des données codées sont créées conformément aux données de base. Les données de base et les données codées sont stockées de manière non-réinscriptible dans la zone de données fixes. Le support d'enregistrement lui-même peut ainsi être authentifié par l'utilisation de la zone de données fixes du support d'enregistrement, et la fabrication de supports d'enregistrement par un autre fabricant s'arrogeant le support peut être évité.
PCT/JP2007/000643 2006-06-19 2007-06-18 Procédé de formation d'une zone de données fixes sur un support inscriptible Ceased WO2007148433A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006168479A JP2007335040A (ja) 2006-06-19 2006-06-19 記録媒体の固定データ領域形成方法、記録媒体、固定データ領域形成装置、認証方法、認証装置
JP2006-168479 2006-06-19

Publications (1)

Publication Number Publication Date
WO2007148433A1 true WO2007148433A1 (fr) 2007-12-27

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PCT/JP2007/000643 Ceased WO2007148433A1 (fr) 2006-06-19 2007-06-18 Procédé de formation d'une zone de données fixes sur un support inscriptible

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JP (1) JP2007335040A (fr)
WO (1) WO2007148433A1 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002059894A1 (fr) * 2001-01-25 2002-08-01 Sony Computer Entertainment Inc. Support d'enregistrement, dispositif de traitement d'informations, serveur de distribution de contenu, procede, programme et son support d'enregistrement

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002059894A1 (fr) * 2001-01-25 2002-08-01 Sony Computer Entertainment Inc. Support d'enregistrement, dispositif de traitement d'informations, serveur de distribution de contenu, procede, programme et son support d'enregistrement

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