KR20170097760A - A method for proving and authenticating secure documents based on measurements of relative position changes of different processes involved in manufacture - Google Patents

Abstract

A method for proving a secure document comprises the steps of: a) selecting a set of unique properties obtained as a result of a change in the manufacturing process and supplies, b) obtaining a digital image of the secure document, C) constructing a message by measuring a register of features selected from the secure document and the document ID data, d) constructing the hashed message, E) encrypting the hashed message by a private key using a public key cryptographic system to obtain a digital certificate; and e. G. And f) storing the digital certificate in an external database.

Description

A method for proving and authenticating secure documents based on measurements of relative position changes of different processes involved in manufacture

The present invention generally relates to a process for verifying and authenticating secure documents. Specifically, the present invention relates to utilizing security features and inherent characteristics already present in a secure document to authenticate and authenticate this kind of document. More particularly, the present invention relates to verifying and authenticating a bill, check, or other secure document by utilizing natural changes during the manufacturing process when printing processes, security features and other characteristics are incorporated into the document.

Due to the remarkable advances in existing graphic reproduction technologies generally available in the marketplace, counterfeit goods that falsify security documents such as checks, bills, and the like with superior quality are becoming common. Therefore, it is extremely important to be able to withstand the technological advances of graphic devices and to prove and authenticate secure documents using methods commonly used devices such as scanners and digital cameras.

In addition, organized crime has found a way to produce large quantities of high-quality counterfeits using these expertise; This fact jeopardizes the trust society has in issuing institutions and the ability of institutions to provide reliable tools to detect counterfeit goods.

Commonly known authentication methods that focus on verification based on devices or automation equipment rely on processes and systems that require equipment with certain characteristics to verify that one security feature of the document is authenticity, Difficulties are imposed by the cost or by requiring special materials. Examples include dynamic optical response systems, such as magnetic materials, UV fluorescent inks, infrared absorbing pigments, dynamic optical response systems, such as phosphorescent attenuation, magnetic bands, and holograms, included in security documents. Unfortunately, criminals are also using more sophisticated methods, and modern access to information and playback media makes virtually any security feature incorporated into the document by commercially available materials and equipment I can imitate it. A counterfeit of a document may include a counterfeit based on a system using a laser or an inkjet printer (a photocopy counterfeit), and a counterfeit (process counterfeit) using a process and material similar to genuine. In the case of photocopy-like counterfeit goods, the central bank may be, for example, a watermark, a magnetic thread, a transparent window, an engraved relief with tactile characteristics, a hologram, Such as ink, and special features that the printer can not imitate. In the case of counterfeit goods by the process, it is difficult to judge whether an untrained user is genuine by simple inspection. Also, in the special case of counterfeiting money, this has a big impact on national finances. Indeed, efforts to eliminate these counterfeits attempt to anticipate commercially high-risk documents for the intended life of the document, with a focus on the materials and inks to be used in the manufacture of the new security documents and to avoid counterfeit goods. In general, the standard approach requires anticipation of when the gap between commercially available technology and the technology intended in the security document will become inevitable due to unavoidable technological advances.

In the case of currencies such as the US dollar and the Euro used in many countries, the risk of counterfeiting increases because it opens opportunities for state criminals, including state sponsored crime organizations.

Thus, whether or not a security document is authentic depends not only on the fact that genuine materials and processes are difficult but not impossible to counterfeit; It is desirable to be able to apply to mathematically proven security, such as digital certificates.

On the other hand, in the case of banknotes widely used in everyday transactions, it is necessary to immediately determine whether this is genuine. As an example, if a person does not detect a counterfeit during a transaction, the person receives the unworthy document, delivers the valuable commodity, and, in some cases, provides cash with the change when the value of the commodity is lower than the value of the counterfeit So that a loss occurs. Therefore, it is required to promptly authenticate security documents such as checks and banknotes, to prevent counterfeit documents affecting the public from infiltrating the national economy, and to maintain trust in the issuing institution.

Forensic testing is very accurate in determining whether a document is genuine or not; However, the time to process a single document is very long and this test is usually expensive and requires specialized equipment. On the other hand, computers and gadgets with ever-increasing image acquisition quality and computing capacity are becoming more popular, and individuals and businesses are becoming more economical. Accordingly, in the case of banknotes, a security document is authenticated using techniques currently available for obtaining a digital image in a device such as a smart phone or scanner connected to a computer capable of analyzing the data to check whether the security document is authentic Lt; / RTI >

It has also been recognized that in the field of secure document testing there must be a balance between conflicting goals of "acceptance" and "rejection", where positive acceptance means that all genuine The ability to properly authenticate (identify and accept) secure documents, and positive rejection is the ability to correctly distinguish and reject all non - authentic security documents. However, there is a potential for negative acceptance where non-genuine documentation is approved as genuine; There is a potential for negative rejection, where a genuine article is considered a counterfeit and is rejected. The certification process has a high level of accuracy with respect to this definition, so it is necessary to be able to avoid fraudulent admission and fraud.

U.S. Patent Application No. 2004/0268130 discloses a system and method for authenticating an article, comprising: selecting a unique feature of the article; and converting the feature to digital data to form an identification code for the article . The encryption system is used to encrypt the identification code associated with the issuer and using the secret private key of the asymmetric cryptographic key pair. Encrypted code is made available for labeling accompanying the article. During the subsequent steps and the authentication station, the digital data associated with this feature is determined directly from the article, and the code is decrypted using the public key of the pair obtained from the third party according to the rules of the public key infrastructure. According to the systems and methods of U. S. Patent Application No. 2004/0268130, a unique feature is the result of a chemical manipulation of an article or a result that is characteristic within or contained in the article. Also, although an encrypted code is available on the label accompanying the article; The code is required to be encrypted without applying a hash function. This fault allows the counterfeiter to access the original data by obtaining the original data representing the uniqueness of the article and commencing the modification. By using a hash function, the counterfeiter can not have information about how to change the item to pass the authentication. Moreover, it is not clear whether the selected properties can withstand the natural deterioration due to the use of the article.

Advanced Track and Trace (ATT) has developed a way to prove printing plates and correspondingly printed bills. It uses a strong encryption method. However, this is limited to plates designed to manufacture banknotes using a number of codes using the ATT process; The main disadvantage is that encryption protection allows you to reproduce only the serial printed in the same edition. Also, due to the complexity of the pattern to be printed, this requires a microscope or some reinforcement and improved quality control to minimize changes in batches of security notes.

As will be appreciated, there is a need for a reliable and fast process for authenticating documents as well as methods for certifying secure documents. In addition, due to the constantly evolving information technology, this method adds security and reliability to physical security documents by means of corresponding digital certificates, provided that all are required to evaluate the validity of the security documents. In particular, considering that the physical documents and the digital certificates are uniquely linked together in this scenario, bills that do not have a valid digital certificate are worthless even if this document is genuine.

Aspects of the present invention provide a system for verifying a bill, a check, or any other secure document. Modes include digitally proving a document that accompanies this change, which means the uniqueness of each piece. This is possible due to natural changes in the industrial manufacturing process as well as information that changes in a predictable and controlled manner, such as serial numbers, serial letters,

In aspects, the process of proving a document composed of a hashed message is used only to check whether the document is authentic, even if it is decrypted, and the information about the characteristics of the original document that can be used in the forgery process Do not show.

Other aspects provide a process for authenticating a bill, check, or any other secure document.

Another aspect provides an authentication method to be performed in an automated manner.

Another aspect provides a method for unambiguously identifying falsified security documents where false negative and false positive authentication occur less frequently.

Another aspect is to classify counterfeit goods by quality and by complexity.

In some aspects, the data that personalizes all secure documents is obtained from a set of properties from changes in registers between features added in different manufacturing processes. These characteristics are related to the specificity and even uniqueness of each security document.

A different message is generated for each secured document using the set of characteristics described above and the data associated with the document ID data.

Further, in some aspects, a method for verifying and authenticating any secure document is based on the aforementioned message requiring a register change that is a result of at least two manufacturing processes,

Selecting a set of unique properties obtained as a result of the manufacturing process and the changes in the feed,

Obtaining a digital image of the secure document and obtaining the data,

Constructing a message by measuring a register difference between the secure document and features from data associated with the document ID data,

Configuring the hashed message, wherein the hashed message is a message obtained after the original message is coded by a unidirectional cryptographic hash function; configuring the hashed message;

Encrypting the hashed message with a private key using a public key encryption system to obtain a digital certificate, and

Storing the digital certificate in an external database and / or marking or printing the digital certificate in the secure document.

According to other aspects, an authentication method is provided,

Providing a secure document to be authenticated,

Verifying that the raw materials and manufacturing processes are present in the secure document by well known image analysis techniques or by other types of traditional verification,

Constructing a corresponding message by measuring a register difference between features from the secured document and data associated with the document ID data,

Obtaining a hashed message for verification by applying a hash function,

Obtaining a proven hashed message; In some aspects, the proven hashed message is obtained from a digital certificate that is marked or printed on the secure document, the digital certificate is decrypted using a public key to render a hashed message for reference; In some aspects, the proven hashed message is obtained from the database by accessing the database,

Authenticating the document by comparing the hashed message for verification with the verified hashed message, wherein if the verified hashed message and the hashed message for verification match, then the document is authentic And if the verified hashed message and the hashed message for verification do not match, then the document is considered to be counterfeit.

Figure 1 shows a general proofing process.
Figure 2 shows a secure document containing images and characters generated from different processes.
Figure 3 shows an example of a secure document showing different points of reference points and points with different images generated from different processes.
Figure 4 is an example of the function _(D M) for processing data to get the message mathematically.
5 is an example of a process of authenticating a secure document.
Figure 6 is one algorithm for authenticating a secure document.

The proof and authentication process is based on the changes that occur during the process steps of fabricating the secure document, and especially in the interaction of these steps.

Some aspects relate to a system for verifying and authenticating secure documents.

Some aspects also relate to a method for authenticating and authenticating an original document, the method being characterized in that unique characteristics of all documents are identified, coded, optionally inserted into the secure document itself, or stored in an external database. The method and the proposed system prevent forgery of the security document.

Aspects of the present invention will become more fully understood from the detailed description given herein below and the accompanying drawings which are given by way of example only, and thus are not limitative of the present invention.

In this specification, the following terms have the meanings mentioned.

Proof (Certification) - authorized (accredited) or authorized (authorized) person or entity (agency) a person or organization in accordance with the established the requirement or standard of goods or services, procedures or processes, or events, or properties of the situation, Formal procedures to evaluate characteristics, qualifications, qualifications or status (and to prove in writing by issuing a certificate).

Authentication (Authentication) - the property of a single data (plural data) or object (entity) acts to determine the truth. Authentication is the process of determining who or what someone is or is actually something.

Secure printing process - a special printing process where a commercially available process can not easily be imitated; For example, it is a process used for printing banknotes.

Security Features - This refers to security features that exist in the security document. These properties are intended to be difficult to imitate using commercially available products, such as in the case of security paper, security inks, watermarks, magnetic threads, transparent windows, tactile features, foils, patches, holograms,

Security Document - This is a document that describes some of the assurances (each of the assurances) in writing, is manufactured using a secure printing process, and can also include security features.

Unique properties - properties generated from natural register changes between features added in different manufacturing processes. These characteristics relate to the specificity and even uniqueness of each security document produced. These characteristics can be acoustical, electrical or magnetic signals and can be measured in the electromagnetic spectrum portion. This includes printing errors or print variations, i.e., random ink smudges, unfilled lines, colors, and the like.

Register -registers are included by different manufacturing processes and refer to relative positioning, alignment, or misalignment between features of a secure document. The relative position between various images or characters or security features generated from different processes during the production of a secure document varies from document to document, making this change inherent and non-repeatable.

The metric for the metric function -set (X)

d: X x X? R

Function (which is referred to as a distance function or simply distance), where R is a real set. For all x, y, and z in X, this function must satisfy the following conditions:

1. d (x, y)? 0

2. d (x, y) = 0 only if x = y

3. d (x, y) = d (y, x)

4. d (x, z) d (x, y) + d (y, z).

Generalized metric function - The generalized metric for set (X) is the same as the metric function, but in some ways its axiom is relaxed (for example, it can only satisfy axioms 1 and 3).

Document ID data - Data that behaves like an identifier for a specific document. The data may be words, numbers, letters, symbols, or any combination thereof. An identifier is a name that identifies a unique document or set of documents (i.e., labels the identity). The abbreviation ID refers to an identifier (i.e., an identification instance). For banknotes this includes the serial number.

Message - association of some metric, generalized metric or other function with the previously selected subset of unique properties (of the secure document register) and the result of applying it to points in the document ID data.

Hashed message - A message encoded by a one-way cryptographic hash function.

Digital certificate - An encrypted hashed message stored in a proof process (encrypted using a private key).

The term " inherent property " is used in all natural changes of the document that occur in the manufacturing process and are measurable; In particular, it is used for the changes provided by the secure printing process for manufacturing secure documents. An example of a unique characteristic is a register.

According to aspects of the present invention, the security features facilitate the authentication of documents to different users of the document by controlling the manufacturing process, distribution and commercialization so that unauthorized individuals or entities acquire security features Are portions or components that are present in the secure document with the aim of preventing tampering.

According to an aspect of the present invention, the inherent properties are natural changes measurable along the manufacturing process.

Also disclosed is a method for digitally proving a secure document through the inherent properties, in particular, data obtained from a register.

In one aspect, a method is provided for digitally verifying a secure document using security features and inherent characteristics already present in the document.

In particular, the document can be digitized, which not only can be performed through a scanner or digital photograph using different sources and types of illumination, but also any other measurement of the physical, chemical, or physicochemical properties of the document From which unique properties can be obtained. In particular, the register can be measured using an apparatus for digitizing an image of the document and visible light.

By "acquiring images" according to an aspect of the present invention, the scanning and digitizing equipment has the following features:

Reflection, transmission, absorption, radiation properties at any wavelength of the electromagnetic spectrum, or a fixed illumination or pulsating state and combinations thereof

보안 문서를 구성하는 재료의 자기적 및/또는 전기적 특성, 예를 들어, 전자기적 디지털 지문;

Magnetic and / or electrical characteristics of the materials making up the security document, for example, electromagnetic digital fingerprints;

음향 특성; 종이는 특정 크기의 응력 사이클을 받을 때 특정 측정 가능한 레벨의 잡음을 발생시킨다;

Acoustic characteristics; Paper generates a certain measurable level of noise when subjected to stress cycles of a certain magnitude;

Security features or characteristics responsive to mechanical and / or chemical and / or electrical stimulation of the paper

And the like.

The features to be measured depend largely on the nature of the manufacturing process used during manufacture of the secure document, as well as on the usage to be provided in this document.

The message is constructed using some features and mathematical correlations between these features. According to aspects of the invention, a metric function is used that is a function of the distance between two points.

The message is constructed using features that can not be degraded, or features with known and / or predictable degradation:

크기가 상이한 여러 구역 및/또는 전체 문서;

Multiple zones and / or entire documents of different sizes;

측정될 특징들은 문서 및 문서를 획득하는 제조 공정에 따라 달라진다;

The features to be measured depend on the document and the manufacturing process in which the document is obtained;

적어도 2개의 상이한 공정들 간의 상호 작용에 의존하는 특징들.

Features that rely on interaction between at least two different processes.

In certain instances of obtaining features from a digital image under any illumination, an image is acquired that highlights the portions intended to be verified. For example, it may be important to prove only a half or a quarter of the size of a secure document, or to generate multiple proofs using a different message for a single document.

The proof and authentication system is presented with reference to the drawings.

A process for manufacturing a secure document according to aspects of the present invention includes:

a) providing a suitable supply comprising security features such as a substrate, ink, security features such as watermarks, threads, transparent windows, colored fibers, foil or patch, etc. (step 11a);

b) performing the process of manufacturing the secure document involving the integration of all of the supplies, wherein the manufacturing process includes: placing at least two different fabrication processes on the substrate with various features, characters or images; Performing the manufacturing process (step 13a) comprising marking or placing the serial number of the document or any other document ID data;

c) verifying the secure document,

  i. Acquiring a digital image of the document (step 10), obtaining data corresponding to a selected group of unique properties for all documents and document ID data (20) The result of the use of water -;

  ii. Constructing (30) the message using a metric function for determining the relative position of previously selected points as a group of unique characteristics as well as document ID data;

  iii. Constructing a hashed message (40) by applying a hash function, wherein the hashed message (50) comprises: constructing the hashed message, which is a message obtained by applying a unidirectional cryptographic hash function;

  iv. Encrypting (60) said hashed message using a private key (70) by a public key encryption system to obtain a digital certificate (80); And

  v. Storing the digital certificate in a database 90, and / or

vi. By marking or printing (97) the digital certificate on the secure document (10)

And verifying the secure document.

2, a security document according to an aspect of the present invention is shown. Some processes are involved for the manufacture of secure documents; As an example, four processes (A, B, C, and E) are shown. Security documents include various images and characters belonging to different manufacturing processes. In the case of Figure 2, step (A) provides an initial substrate for a secure document, which includes some security features such as a thread or foil (ai) and a watermark or electrotype image (aii) . Process (B) provides a set of images (bi), for example in the form of offset printing. The step (C) provides the security document with an image (ci) and also a letter (ciii), in this example a letter referring to the denomination, and a letter (cii) referring to the name of the issuing authority; As an example, this can be an engraving process. In addition, the step (E) provides the serial number of the secure document e1 exemplified as a banknote. In some aspects, the secure document is certified according to the process shown in Figure 1; As a result, the digital certificate obtained in the proof process can be selectively printed with the feature (fi) on the secure document.

According to aspects of the present invention, at least one characteristic of the following unique characteristics of the secure document is considered to prove the document,

Electromagnetic response (IR, visible, UV)

register

Number and location of fluorescent fibers

Print error or print change: Random ink smudges, unfilled lines, colors,

Physical properties,

음향적 특성,

Acoustic characteristics,

전기적 특성,

Electrical properties,

자기적 특성,

Magnetic properties,

등

Etc

/ RTI >

And at least one document ID data,

시리얼 번호,

Serial number,

문서의 액면 금액,

The face value of the document,

이름,

name,

날짜 등을 요구한다.

Date and so on.

1 illustrates a demonstration process in accordance with an aspect of the present invention; The security document may be stored in a well known process of the prior art, including the steps of providing a special supply 11a, producing a substrate 13a, and performing a manufacturing process 13a comprising various steps (Step 10).

The document thus produced is subjected to a process (step 20) (step 1) of obtaining data to obtain information about the specific data of each manufactured item and, in particular, the relative position between various characters or images present in the secure document .

The data from the relative positions of the images and characters present in the secure document are used to construct a numeric message. FIG. 3 illustrates a method for obtaining data from a secure document. The message 30 obtained in step 20 consists of data relating to the relative position between images and characters and the location of images and characters depends on the process of placing this image and characters on the secure document . For example, in FIG. 3, a secure document is represented that includes images generated by sequences of steps (A), (B), (C), and (E). As noted, for each image or process, at a specific random location, which provides for easy access or identification, for example at a particular corner of the image, at some marked dots, etc., (A1, A2, ..., AN), B1, B2, ..., BN, C1, C2, ..., CN, E1, E2, , And a first relative position (D1 (A1, A2) of the first relative point A2 in the image A is then calculated for the reference point A1; The second relative position (D2 (A1, B1)) of the relative point B1 in the image B with respect to the reference point A1 is calculated. In the same manner, a third relative position (D3 (A1, C1)) of the relative point C1 in the image C is calculated; And optionally, a fourth relative position (D4 (A1, E1)) of the relative point E1 in the image D is also calculated. In some aspects, taking the second reference point B2 in the image B, the third reference point C2 in the letter C, or the fourth reference position E2 in the letter E as reference, Positions are also calculated. The metric is also calculated for each relative position from each reference point, as well as for other trigonometric values and other mathematical quantities related to the distance between points. Thus, various reference points and various measurement values can be defined.

The secure document data is then associated with a mathematical function, such as a mathematical matrix as shown in Fig. 4, in accordance with the "message" of the secure document. As mentioned, for it is possible to configure a variety of messages from the one of the common security message specific part of it is possible, or security documents that comprise the (M _D) for all the measured characteristics, and for example, A message _MDA indicating the relative position of the dot A to the remaining dots A, B, C and E or a message M _DCB relating to the relative position between the dot C and the dot B, Or a message (M _DEC ) relating to the relative position of the dot from the shapes C and E is possible. This is used, for example, when it is desirable to authenticate a document if, for example, the document is a fragment or if only a portion of the document is available in case the security document is torn.

Some mathematical methods for obtaining messages from collected information exist in the prior art. For example, a protocol that follows the value of a relative position, or a mathematical regression, for example, a linear regression, an algebraic regression or other kind of mathematical regression. In some aspects, it is desirable to use a metric function.

Not only can a process of digitizing or capturing an image be performed via, for example, a digital photo or scanner, in order to obtain various reference points and relative positions; Any other physical and / or chemical measurements of the inherent characteristics of all documents, such as paper type, paper weight, paper texture, paper color, ink type, ink color, etc., can be performed. The digitizing step may be performed in the digitizing module following the manufacturing step 13a.

As an example, when a subset of unique properties arise from a register between different processes involved in the production of a secure document, a change between images and characters resulting from processes (A, B, C, and E) And is generated in the order of quintillion according to the resolution of the digital image.

As mentioned, the change level provides a unique, non-repeatable way of identifying a document, which is extremely difficult to accurately reproduce even the original manufacturer.

In addition, when other unique properties such as the number and location of color fibers or fluorescent fibers as well as resistors are used, the number of changes can be increased by several hundreds of digits.

By selecting points in accordance with aspects of the present invention, it is possible to obtain a possible combination of number of quintiles; It is therefore almost impossible for a counterfeiter to obtain a document with the same unique characteristics as those contained in the digital certificate generated according to the embodiment.

Especially in the case of banknotes, even if the original manufacturer wants to forge an exact copy of one document, it is possible to produce a large number of documents (on the order of quintiles), then select the document with the same change, You should attach the document ID data with the same certificate as the original. Thus, especially in the case of banknotes, this method of using resistors makes counterfeiting impossible, but rather makes counterfeiting very complicated and inefficient, making it economically unfeasible.

However, in order to avoid an attacker statistically studying the changes of the official manufacturer, the message obtained in step 30 is transformed in step 40 through the use of a mathematical hash function and then used to generate a unique digital certificate Is encrypted in step 60. [

In step 40 of Figure 1, the message obtained in step 30 may be used as a mathematical function, such as a hash function, to obtain a hashed message comprising at least one chain of characters in step 50 of Figure 1 ≪ / RTI > For example, there are some mathematical methods for executing a hash function by a mathematical unidirectional process or model (algorithm) that conveys a character chain.

The hash function is then encrypted at step 60 to generate an encrypted hashed message or digital certificate. An asymmetric encryption algorithm is used that requires the private key 70 to generate the digital certificate 80 in the form of an encrypted alphanumeric chain to encrypt the hashed message.

As shown in Figure 1, the digital certificate is stored in a database 90, which may be maintained at a server located in the security facility, and / or the digital certificate is obtained by obtaining data such as bar code, code or plain text fi The document 10 may be re-marked or printed 97 in a manner readable by the same mechanism to print the document 10 (e.g., 20). In addition to storing the digital certificate 80, when using the database 90, the digital certificate in the database may also be stored in a database, such as a serial number of the secure document, a scanned copy of the document, It may be useful to associate with the ID data information.

A digital certificate is a validation element associated with the document ID data of a secure document and refers to a specific relationship between images and characters that exist in a manner unique to each secure document.

The digital certificate 80 serves as a barrier to an unauthorized third party who wants to read a counterfeit document or bill with the reader and print a label thereon indicating a scan of the reader according to an encryption scheme. Generally, a digital certificate (e.g., a bar code label or other mark) may represent a cipher text that can be decrypted with a public key, and a private key may be reserved to an authorized proof party or authority. However, as mentioned, the digital certificate may not be included in the secure document. As already mentioned, the digital certificate represents the unique and non-repeatable physical characteristics of the images and characters present in the secure document and does not provide additional information on how to forge or alter the copy.

The encrypted information is then placed as a mark in step 97 of FIG. 1 or reprinted. The digital certificate 80 and the hashed message 50 as well as the document ID data and the partially hashed message of the secure document are stored in the database 90 disposed in the server available for general access. A digital certificate in the form of a fi element may optionally be inserted into the secure document 10.

In some aspects of the invention, the digital certificate may be selected from a bar code or two-dimensional bar code element or string f1.

Thus, the digital certificate 80 is the result of inherent, non-repeatable relationships between various images and characters due to the registers, due to the manufacturing process, present in the secure document.

Certification process

Certified security documents are subject to additional certification. The authentication process of the circulating security document is shown in Figs. 5 and 6. Fig. Authentication of a secure document is an operation performed by a certification authority, for example, a certification authority of an issuing organization, but may also be performed both by the certification authority and by a user of the document if the user wishes to authenticate the document. 5, a user or authority that wishes to know whether a published document 110 is genuine or not, may first access a security feature (watermark, security thread, security ink, security process, etc.) (Step 120); < RTI ID = 0.0 > Here, a simple photocopy and a rough copy are distinguished in step 120 of FIG. 5 and in step 121 of FIG. 6, thereby being considered a low-quality counterfeit (122, FIG. 6).

Thereafter, if the raw materials and printing processes present in the authenticated document are considered to be genuine (step 123, FIG. 6), a hashed message must be generated according to the characteristics of the user's document. For this purpose, the user / authorizing authority acquires (step 130) the data of the secure document by any device capable of obtaining the required digital image and then uses the metric function and document ID data to construct Step 140) and apply (150) the hash function to obtain (160) a hashed message for verification.

As a next step, the user can acquire (130) data, automatically configure (140) the message via a metric function, and apply a hash function to the message to obtain a hashed message (160) for verification 150, < / RTI > a smartphone, tablet, or other processing device is provided.

In order to authenticate the secure document, the hashed message 160 for verification is compared with the decrypted hashed message 260. The digital certificate 80 (FIG. 1) needs to be searched in some manner to obtain the decrypted hashed message 260. One source of the digital certificate 80 (FIG. 1) for verification is the database 280 created during authentication. Considering that the data acquisition and processing module is operable to access a database managed by a certificate authority, the digital certificate may be decrypted (250) by the public key 230 to obtain a decrypted hashed message 260 have. The database may be part of a mass storage device that forms part of a reader device, or may be accessed by a reader over a remote communication link at a remote location. The telecommunications link may take any conventional form, including a wireless link and a fixed link, and may be available over the Internet. The data acquisition and processing module may be operable, at least in some modes of operation, such that a signature can be added to the database if no match is found. Such accommodations are normally permitted only to authorized persons for obvious reasons. It should be noted that although the public key is used to decrypt the digital certificate but is not used to encrypt the hashed message, abuse of the public key does not provide forgery of the document.

In some aspects of the present invention, a hashed message 160 for verification of a secure document is provided to a certificate authority and the certificate authority receives a corresponding decrypted hashed message 260 from the database 280 as described above, And perform a comparison to establish whether the hashed message 160 for verification matches the decrypted hashed message 260.

Another source for retrieving the digital certificate 80 (Fig. 1) is a barcode or two-dimensional barcode element or string (f1 in Fig. 2) marked / printed on the secure document.

In some aspects of the invention, the digital certificate may be decrypted 250 by public key 230 to obtain a decrypted hashed message 260, and the hashed message 160 for verification may be decrypted May be used to perform comparisons to establish whether they are consistent with the hashed message 260, which may be performed locally by the user.

Finally, if the hashed message 160 for verification matches the decrypted hashed message 260, then this document is qualified as a genuine document (400 in FIG. 6). On the other hand, if the hashed message 160 for verification does not match the corresponding decrypted hashed message 260, then this document is considered to be a high-quality counterfeit product 305. The occurrence of such counterfeit goods can provide the element / evidence for investigating crime patterns.

As shown in FIG. 6, first, the user performs a step 121 of verifying whether the original security manufacturing process existing in the security document such as banknote and the genuine raw material exists. If these materials and processes are not present, the document is considered to be a low quality counterfeit product 122. If expected materials and processes are present in this document and considered to be genuine, the user performs step 130 of acquiring data.

In some aspects of the invention, the authentication process is performed using an application for an intelligent device such as a smartphone or tablet. The application guides the user to obtain an accurate image and provides a means to connect to the certification authority. The result of the comparison process is conveyed after authentication by the certification authority.

The method provides the possibility to classify counterfeit goods by manufacturing characteristics; For this purpose, equipment for automatically classifying and registering counterfeit goods is required, which combines the pieces statistically with a "counterfeiter" (not necessarily a person) to detect even minor improvements from counterfeit goods It is responsible for registering the characteristics of all counterfeit goods arriving at the issuing authority in order to create the database with all extracted information. This information is used to investigate and track counterfeit crimes.

An image acquisition system (digital camera, scanner), image processing equipment (for example, CPU, GPU, FPGA), storage system (data server) are required for authentication. In step 97, the marking / printing apparatus may be an inkjet printer, a numbering machine, a laser marking apparatus, a labeling apparatus, or the like.

An image acquisition system (e.g., a digital camera, a mobile phone camera, a scanner, etc.), an image processing system (e.g., a CPU [PC, server, tablet, smartphone, etc.], GPU, FPGA, etc.) is required for authentication. In the case of database 280: access to a database (Internet, SMS, LAN, WAN, VPN, etc.) is required.

Having thus described aspects of the invention, it will be apparent that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be obvious to one skilled in the art are encompassed within the scope of the following claims.

Acknowledgments:

ndez T

llez)와 우리엘 만체보 델 카스틸로(Uriel Mancebo del Castillo)에게 감사의 말을 전하고 싶다.Mario Hern, the author of numerous useful discussions,

ndez T

llez) and Uriel Mancebo del Castillo (Uriel Mancebo del Castillo).

Claims (18)

A method for authenticating a secure document,
Selecting a set of unique properties, said unique properties being associated with changes in processes and supplies for producing a secure document;
Obtaining a digital image of the secure document, obtaining data of a set of unique properties, such as relative position between one or more features,
Constructing a message by measuring a register of one or more features selected from the secure document and from the document ID data,
Configuring a hashed message, wherein the hashed message is constructed by encoding the message with a one-way cryptographic hash function, constructing the hashed message;
Encrypting the hashed message with a private key using a public key encryption system to obtain a digital certificate, and
And storing the digital certificate in an external database. The method of claim 1, wherein the digital certificate is marked or printed on the secure document. The method of claim 1, wherein the digital image is acquired with light having a wavelength between 200 nanometers and 1500 nanometers. The method of claim 1, wherein the digital image is acquired as visible light. The method of claim 1, wherein a large portion of the same document is independently verified. The method of claim 1, wherein the secure document is a bill, a check, a passport, a visa, an identification, or a birth certificate. 2. The method of claim 1, wherein the data is obtained during a manufacturing line. 2. The method of claim 1, wherein the data is obtained during a quality check. A method for authenticating a verified secure document,
Providing a security document to be authenticated;
Verifying that genuine security raw materials and manufacturing processes are present in the secure document,
Obtaining a digital image of the secure document, obtaining a digital image of the secure document, and obtaining data of a set of unique characteristics, such as relative position between one or more features;
Constructing a message by measuring a register of one or more features selected from the secure document and from the document ID data,
Applying a hash function to the message to obtain a hashed message for verification,
Retrieving and decrypting the stored digital certificate to obtain the verified hash message for the secure document;
And authenticating the document by comparing the hashed message for verification and the verified hashed message, wherein if the verified hashed message and the hashed message for verification match, then the document is authentic And the document is considered to be a counterfeit if the verified hashed message and the hashed message for verification do not match. 10. The method of claim 9, wherein the verified hashed message is obtained from the digital certificate marked or printed on the secure document and the digital certificate includes a public key to render the verified hashed message for reference And decrypting the encrypted document. 10. The method of claim 9, wherein the verified hashed message is obtained by accessing the database. 10. The method of claim 9, wherein the raw material is verified through image analysis and pattern recognition methods. 10. The method of claim 9, wherein the secure document is a bill. 10. The method of claim 9, wherein the secure document is a bills having at least a watermark, or a security thread, or a foil, or a substrate comprising a transparent window or fluorescent fibers. 10. The method of claim 9, wherein the bill is printed using at least offset printing or intaglio printing. 10. The method of claim 9, wherein the authentication is performed by a commercially available scanner or digital camera connected to the computer. 10. The method of claim 9, wherein the authentication is performed by a smartphone or a tablet. 10. The method of claim 9, wherein the authentication is performed by a cash handling device.

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