KR102154897B1 - Method for supervising digital contents using block chain and fingerprinting, device and computer readable medium for performing the method - Google Patents

Abstract

A digital content management method using a block chain and fingerprinting according to an embodiment of the present invention receives user information from a purchaser terminal in the process of mediating an electronic transaction for digital content using a block chain network, and receives user information. Based on the selection of at least one arbitrary position of the bit string constituting the digital content, digital fingerprinting information generated based on user information may be inserted for each selected position and stored in the blockchain network.

Description

Digital content management method using blockchain and fingerprinting, device and recording medium for performing it {METHOD FOR SUPERVISING DIGITAL CONTENTS USING BLOCK CHAIN AND FINGERPRINTING, DEVICE AND COMPUTER READABLE MEDIUM FOR PERFORMING THE METHOD}

The present invention relates to a digital content management method using a block chain and fingerprinting, an apparatus and a recording medium for performing the same, and more specifically, a convergence of a block chain technology and a digital fingerprinting technology to prevent unauthorized distribution of digital content. The present invention relates to a digital content management method using a blockchain and fingerprinting to manage digital content, an apparatus and a recording medium for performing the same.

With the development of multimedia technology and infrastructure communication facilities, the distribution of digital data through networks is increasing rapidly, and accordingly, the problem of illegal distribution of digital contents has also emerged as a serious problem.

In order to solve this problem, research is being conducted to apply technologies such as Digital Rights Management (DRM) or digital watermarking to digital data. In particular, digital fingerprinting is a method of protecting multimedia copyrights based on digital watermarking technology, and is a technology that inserts information in a form that cannot be detected by human sensing capabilities into digital contents.

While digital watermarking is used to prove validity in future intellectual property disputes by embedding copyright holder or seller's information into multimedia contents, digital fingerprinting is digital in terms of embedding confidential information into digital contents. It can be considered the same as watermarking, but it is a technology used to track illegal content distributors that will occur later by inserting information about users who have purchased digital content, not information about copyright holders or sellers.

However, the conventional digital fingerprinting has a problem in that it is vulnerable to collusion attacks. In other words, when digital watermarking is used, the information inserted into all the contents sold is the same, whereas when fingerprinting is used, the contents sold have slightly different information for each purchased user. There is a problem in that when the fingerprinting position is determined by comparing the content with fingerprinting inserted, the fingerprinting bit is erased, or a fingerprinting bit that is completely irrelevant is inserted to reconstruct the content and redistribute it.

Accordingly, there is a need for a digital fingerprinting technology that is robust against collusion attacks.

Korean Patent Registration No. 10-0752511 Korean Patent Registration No. 10-1224744

One aspect of the present invention is a digital content management method using a blockchain and fingerprinting, which can ensure the reliability of digital fingerprinting inserted into digital content while ensuring integrity when transacting digital content, and an apparatus and record for performing the same Provide the medium.

The technical problem of the present invention is not limited to the technical problem mentioned above, and other technical problems that are not mentioned will be clearly understood by those skilled in the art from the following description.

A digital content management method using a block chain and fingerprinting according to an embodiment of the present invention includes a user from a purchaser terminal of a purchaser who purchases the digital content in the process of mediating an electronic transaction for digital content using a block chain network. Receiving information, selecting at least one arbitrary position of the bit string constituting the digital content based on the user information, inserting digital fingerprinting information generated based on the user information for each selected position, and inserting the digital fingerprint The digital content into which printing information is inserted is stored in the blockchain network.

Selecting at least one arbitrary position of the bit string constituting the digital content determines the number of generations of the digital fingerprinting information based on the user information, and selects an arbitrary position within the bit string by the determined number of generations. It can be.

Determining the number of generations of the digital fingerprinting information based on the user information comprises dividing a character string included in the user information for each character, and determining the number of generations of the digital fingerprinting information according to the number of separated characters. Can be.

Inserting the digital fingerprinting information generated based on the user information generates the digital fingerprinting information for each character constituting the character string, and the digital fingerprinting information according to the sequence of the character string at a selected position. May be sequentially inserted.

Generating the digital fingerprinting information for each character constituting the character string comprises generating a sub conversion code for any one character constituting the character string, and generating a full conversion code for the entire character string, The digital fingerprinting information reflecting the sub-conversion code and the entire conversion code may be generated for each character.

Generating the sub conversion code and the entire conversion code includes generating a private key based on identification information included in the user information, and generating a public key corresponding to the block chain address of the purchaser terminal based on the private key. And converts any one character or the entire string into a hash value using a hash function, and encrypts the hash value using the private key to obtain the sub-conversion code and the entire conversion code. It can be something to create.

The digital fingerprinting information may be in a form in which the sub conversion code, the public key, and the entire conversion code are sequentially combined.

It may further include extracting a plurality of the fingerprinting information included in the digital content stored in the blockchain network, analyzing the extracted plurality of fingerprinting information, and determining whether to distribute the digital content without permission.

In addition, in the computer-readable recording medium according to an embodiment of the present invention, a computer program for performing a digital content management method using a block chain and fingerprinting according to the present invention may be recorded.

In addition, the digital content management apparatus using a block chain and fingerprinting according to an embodiment of the present invention is a purchaser terminal of a purchaser who purchased the digital content in the process of mediating an electronic transaction for digital content using a block chain network. A user information receiving unit that receives user information from, selects at least one arbitrary position of a bit string constituting the digital content based on the user information, and inserts digital fingerprinting information generated based on the user information for each selected position And a registration unit for storing the digital content into which the digital fingerprinting information is inserted and a fingerprinting insertion unit for storing the digital content in the blockchain network.

According to one aspect of the present invention described above, the number of generations of digital fingerprinting information and characteristics of each digital fingerprinting information are determined based on user information received from a purchaser, and each digital fingerprinting information is related to each other. It has a strong and reliable digital content distribution can be achieved.

1 is a conceptual diagram showing a schematic configuration of a digital content management system using a block chain and fingerprinting according to the present invention.
FIG. 2 is a block diagram showing a detailed configuration of a digital content management apparatus using the block chain and fingerprinting shown in FIG. 1.
3 to 5 are diagrams for explaining a detailed process of generating digital fingerprinting information generated by the management device of FIG. 1.
6 is a flowchart illustrating a schematic flow of a digital content management method using a block chain and fingerprinting according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION The detailed description of the present invention to be described later refers to the accompanying drawings, which illustrate specific embodiments in which the present invention may be practiced. These embodiments are described in detail sufficient to enable a person skilled in the art to practice the present invention. It is to be understood that the various embodiments of the present invention are different from each other, but need not be mutually exclusive. For example, certain shapes, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the present invention in relation to one embodiment. In addition, it should be understood that the location or arrangement of individual components within each disclosed embodiment may be changed without departing from the spirit and scope of the present invention. Accordingly, the detailed description to be described below is not intended to be taken in a limiting sense, and the scope of the present invention, if properly described, is limited only by the appended claims, along with all scopes equivalent to those claimed by the claims. Like reference numerals in the drawings refer to the same or similar functions over several aspects.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the drawings.

1 is a conceptual diagram showing a schematic configuration of a digital content management system using a block chain and fingerprinting according to the present invention.

Specifically, the digital content management system 1000 using a block chain and fingerprinting according to the present invention includes an author terminal 100, a purchaser terminal 200, and a digital content management device 300 using a block chain and fingerprinting. Management device).

The author terminal 100 is a device possessed by an author who produces digital content, and may be a smart device capable of inputting and outputting information and performing wired or wireless communication, such as a smart phone or a computer. The author terminal 100 may upload digital content input from the author to the management device 300 and transmit and receive data required for a smart contract process of the uploaded digital content.

The purchaser terminal 200 is a device possessed by a purchaser who purchases the produced digital content, and may be a smart device such as a smart phone or a computer that can input and output information and perform wired or wireless communication. The purchaser terminal 200 may transmit and receive data required for a smart contract process with the author terminal 100 through the management device 300 in order to purchase the digital content uploaded to the management device 300.

The management device 300 may be in the form of a management server that mediates a digital transaction process between an author who produces digital content and a purchaser who consumes digital content. The management device 300 may communicate with the author terminal 100 and the purchaser terminal 200 using a previously established blockchain network to relay a transaction and contract process of digital content between the two.

In particular, the management device 300 may manage digital content by fusion of a block chain technology and a digital fingerprinting technology to prevent unauthorized distribution of digital content. In this regard, it will be described with reference to FIG. 2.

FIG. 2 is a block diagram illustrating a detailed configuration of the management device 300 of FIG. 1.

Specifically, the management device 300 according to an embodiment of the present invention may include an electronic transaction management unit 310 and a digital content management unit 320.

The electronic transaction management unit 310 may perform a series of processes required for electronic transaction of digital content uploaded to the management device 300.

Specifically, the electronic transaction management unit 310 may receive digital content to be sold from the author terminal 100. The electronic transaction management unit 310 may upload the received digital content to be displayed on a web page linked to the management device 300.

In this process, the electronic transaction management unit 310 may also receive author information from the author terminal 100. The author information may include identification information for identifying the author, such as biometric information, the author's ID, and personal information, and an integrated copyright number (ICN) indicating information on digital content.

Thereafter, when the electronic transaction management unit 310 receives a purchase request signal from the purchaser terminal 200 for a specific digital content among a plurality of uploaded digital content, the author terminal for the digital content ( 100) and the purchaser terminal 200 may mediate the smart contract process. Blockchain-based smart contract technology is a well-known technology, so a detailed description will be omitted.

The digital content management unit 320 may insert digital fingerprinting information into the transacted digital content. To this end, the digital content management unit 320 may include a user information receiving unit 321, a fingerprinting inserting unit 322 and a registration unit 323.

The user information receiving unit 321 may receive user information from the purchaser terminal 200 of a purchaser who purchases digital content in a process of mediating electronic transactions for digital content using a blockchain network. The user information may be in the form of a digital string in which various information that can identify the purchaser, such as the purchaser's ID and name, is converted into text.

The fingerprinting insertion unit 320 may generate digital fingerprinting information based on the received user information. In this case, the fingerprinting insertion unit 322 may determine the number of generations of digital fingerprinting information and the insertion position of the digital fingerprinting information in order to insert a plurality of digital fingerprinting information into the digital content.

In an embodiment of the present invention, the fingerprinting insertion unit 320 may randomly determine the number of generations and insertion positions of digital fingerprinting information. Specifically, the fingerprinting insertion unit 320 may subdivide a bit stream (bit stream) constituting digital content into a random size, and insert digital fingerprinting information in a random number at a random place among the subdivided bits. have.

In this case, the purchaser cannot check where the digital fingerprinting information is inserted, and even if any one of the digital fingerprinting information is distributed without permission in a forged, altered, or deleted state, by extracting other unmodified digital fingerprinting information. Unauthorized distribution routes can be traced.

Meanwhile, in another embodiment of the present invention, the fingerprinting inserting unit 320 may determine the number of generations of digital fingerprinting information and the insertion position of the digital fingerprinting information according to a result of analyzing a character string constituting user information. In this regard, it will be described with reference to FIGS. 3 to 5 together.

3 to 5 are diagrams illustrating an example of digital fingerprinting information generated by the fingerprinting inserting unit 322.

As described above, the fingerprinting inserting unit 322 may analyze a character string constituting user information to determine the number of generations and insertion positions of digital fingerprinting information.

First, the fingerprinting insertion unit 322 may classify a character string constituting user information for each character. For example, when the user information is in the form of an ID composed of ABCD, the fingerprinting inserting unit 322 may classify the character string'ABCD' into'A','B','C', and'D'. As another example, when the user information is the name of a buyer, such as Hong Gil-dong, the fingerprinting inserting unit 322 may classify the character string'Hong Gil-dong' into'hong','gil', and'dong'.

The fingerprinting insertion unit 322 may determine the number of generations of digital fingerprinting information based on a result of classifying a character string. For example, when the fingerprinting inserting unit 322 receives a character string composed of four characters as user information, it may determine the number of generations of digital fingerprinting information to be four. That is, the fingerprinting inserting unit 322 may classify a character string included in the user information for each character and determine the number of digital fingerprinting information generated according to the number of the separated characters.

Hereinafter, for convenience of explanation, it is assumed that the user information is a character string composed of ABCD, and accordingly, it is assumed that the number of digital fingerprinting information is four.

Next, the fingerprinting insertion unit 322 may determine the insertion position of the fingerprinting information to be generated in a process described later.

Specifically, as shown in FIG. 3, the fingerprinting insertion unit 322 may determine the insertion positions P1, P2, P3, and P4 of four different digital fingerprinting information.

As will be described later, since information indicating individual characteristics of each character and information indicating characteristics of the entire character string are combined in each digital fingerprinting information, a plurality of generated digital fingerprinting information may have mutual correlation. At this time, when the insertion position of each digital fingerprinting information is randomly determined, the user information estimated from the respective digital fingerprinting information and the user information received through the user information receiving unit 321 do not match, and the management device Even though the digital fingerprinting information 300 has not been modified, it may be determined that the digital fingerprinting information has been modified.

To this end, the fingerprinting insertion unit 322 randomly determines each insertion position (P1, P2, P3, P4), but the digital fingerprinting information may be controlled to be sequentially inserted according to the order of the character string.

That is, as shown in FIG. 4, the fingerprinting inserting unit 322 includes the first digital fingerprinting information (F1) for the letter A at the leftmost P1 among the randomly set insertion positions (P1, P2, P3, P4). ) Can be controlled to be inserted. In addition, the fingerprinting inserting unit 322 may control the second digital fingerprinting information for the letter B to be inserted into P2 adjacent to P1. Similarly, the fingerprinting insertion unit 322 inserts the third digital fingerprinting information for the character C into P3, and the fourth digital finger for the character D at the position P4 set at the rear of the bit string (data stream). It is possible to control so that printing information is inserted.

In this way, the fingerprinting inserting unit 322 determines the number of generations of digital fingerprinting information based on the received user information, and the number of digital fingerprinting information is inserted within the bit string constituting the digital data by the determined number of generations. You can choose a location.

At the same time, the fingerprinting inserting unit 322 may generate digital fingerprinting information for each character constituting the character string.

5 is an example of a detailed data structure of digital fingerprinting information F1 for a letter A among four fingerprinting information.

As illustrated, the digital fingerprinting information may be in a form in which a sub conversion code for the letter A, a public key, and an entire conversion code for the character string ABCD are sequentially combined.

That is, the fingerprinting inserting unit 322 generates a sub conversion code for any one character A constituting a character string, generates a full conversion code for the entire character string (ABCD), and then generates the sub conversion code and the entire conversion code. Digital fingerprinting information F1 for the letter A may be generated by combining the conversion codes.

Specifically, the fingerprinting inserting unit 322 may convert the character A into a hash value using a hash function, and generate a sub-conversion code by encrypting the converted hash value.

In this process, the fingerprinting insertion unit 322 generates a private key for the purchaser terminal 200 based on the identification information (resident registration number, biometric information, etc.) of the purchaser included in the user information received from the purchaser terminal 200. It is generated, and the hash value can be encrypted using the generated private key. In this case, the fingerprinting insertion unit 322 may generate a private key-public key pair by generating a public key corresponding to the block chain address of the purchaser terminal 200 based on the generated private key. The generated public key can be used in the process of decrypting the encrypted digital fingerprinting information.

In a similar way, the fingerprinting inserting unit 322 converts the character string ABCD into a hash value using a preset hash function, and encrypts the converted hash value using the private key of the purchaser terminal 200 to generate the entire conversion code. Can be created.

Thereafter, the fingerprinting inserting unit 322 may sequentially combine the generated sub-conversion code and the entire conversion code to generate digital fingerprinting information for the letter A.

In this case, when the sub conversion code and the entire conversion code are directly combined, the division between the sub conversion code and the entire conversion code may become ambiguous. To solve such a problem, the fingerprinting inserting unit 322 may generate digital fingerprinting information for the letter A by inserting the public key of the purchaser terminal 200 between the sub-conversion code and the entire conversion code. In other words, the fingerprinting inserting unit 322 may generate digital fingerprinting information F1 for the letter A in a form in which the sub conversion code, the public key, and the entire conversion code are sequentially combined.

In this way, the fingerprinting inserting unit 322 may generate digital fingerprinting information for each of the other characters B, C, and D constituting the character string.

Thereafter, the fingerprinting inserting unit 322 may sequentially insert each of the generated digital fingerprinting information into preset positions P1, P2, P3, and P4 of a bit string constituting the digital content.

As described above, each digital fingerprinting information may include information on matched characters and entire character strings. Therefore, even if only one digital fingerprinting information is searched, a distribution path of digital content can be tracked, and when all digital fingerprinting information is analyzed in an integrated manner, it is possible to reliably determine whether some digital fingerprinting information has been modified.

However, when the digital fingerprinting information is not sequentially inserted, it may be determined that the digital fingerprinting information is modified even though each digital fingerprinting information is not modified in the process of analyzing all digital fingerprinting information. For example, when each of the generated digital fingerprinting information is inserted in the ACBD order, the registration unit 323 to be described later determines the digital fingerprinting information for the letter B in the process of determining the unauthorized distribution of digital content. It may be determined that it has been modified with fingerprinting information.

Accordingly, the fingerprinting inserting unit 322 may control the generated digital fingerprinting information to be sequentially inserted into preset positions (P1, P2, P3, P4) of the bit string constituting the digital content.

The registration unit 323 may store digital content into which digital fingerprinting information is inserted in a blockchain network. The registration unit 323 may distribute and store digital content into which digital fingerprinting information is inserted in a plurality of nodes constituting a blockchain network. In this case, the registration unit 323 may generate a block for the digital content into which the transaction information of the digital content and the digital fingerprinting information are inserted and connect it to a chain of the block header.

In addition, the registration unit 323 may determine whether a specific digital content is distributed without permission, and transmit the result to the author terminal 100 or the purchaser terminal 200. Specifically, the registration unit 323 may extract digital fingerprinting information included in the requested digital content when it is requested to check whether a specific digital content is distributed without permission. The registration unit 323 may compare digital fingerprinting information included in the digital content stored in the blockchain network with the extracted digital fingerprinting information to determine whether the digital content is distributed without permission.

As described above, the management device 300 according to an embodiment of the present invention can determine the number and characteristics of digital fingerprinting information generated based on user information received from a purchaser terminal of a purchaser who has purchased digital data, thereby preventing a collusion attack. It has the effect of overcoming the disadvantages of the weak conventional fingerprinting technology.

6 is a flowchart illustrating a schematic flow of a digital content management method using a block chain and fingerprinting according to an embodiment of the present invention.

The digital content management method using a block chain and fingerprinting according to the present invention can be performed by the management device 300, and the management device 300 manages digital content using the blockchain and fingerprinting according to the present invention. The software (application) in which the method is implemented may be installed in advance.

The management device 300 may receive user information from a purchaser terminal of a purchaser who purchases digital content in a process of mediating an electronic transaction for digital content using a block chain network (610).

The management device 300 may insert digital fingerprinting information into the digital content based on the received user information (620). Specifically, the management device 300 may generate the number of digital fingerprinting information and digital fingerprinting information for each character string by classifying the character strings constituting the user information received from the purchaser terminal 200, and The digital fingerprinting information may be inserted in the order of character strings at a plurality of randomly set insertion positions. Since detailed information related to this has been described above, a repeated description will be omitted.

Thereafter, the management device 300 may store the digital content into which the digital fingerprinting information is inserted in the blockchain network (630). The management device 300 may determine whether to illegally distribute the same digital content and whether the digital fingerprinting information is modified by using the digital content stored in the blockchain network.

Such a technology for providing a digital content management method using blockchain and fingerprinting can be implemented as an application or implemented in the form of program instructions that can be executed through various computer components and recorded in a computer-readable recording medium. . The computer-readable recording medium may include program instructions, data files, data structures, etc. alone or in combination.

The program instructions recorded in the computer-readable recording medium may be specially designed and constructed for the present invention, and may be known and usable to those skilled in the computer software field.

Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tapes, optical recording media such as CD-ROMs and DVDs, magnetic-optical media such as floptical disks. media), and a hardware device specially configured to store and execute program instructions such as ROM, RAM, flash memory, and the like.

Examples of the program instructions include not only machine language codes such as those produced by a compiler, but also high-level language codes that can be executed by a computer using an interpreter or the like. The hardware device may be configured to operate as one or more software modules to perform processing according to the present invention, and vice versa.

Although the above has been described with reference to embodiments, those skilled in the art will understand that various modifications and changes can be made to the present invention without departing from the spirit and scope of the present invention described in the following claims. I will be able to.

100: author terminal
200: buyer terminal
300: management device

Claims (10)

In a digital content management method using a block chain and fingerprinting performed by a digital content management device,
In the process of brokering electronic transactions for digital content using a blockchain network, user information is received from the purchaser terminal of the purchaser who purchased the digital content,
Selecting at least one arbitrary position of a bit string constituting the digital content based on the user information, and inserting digital fingerprinting information generated based on the user information for each selected position,
Store the digital content into which the digital fingerprinting information is inserted in the blockchain network,
Selecting at least one arbitrary position of the bit string constituting the digital content,
Determining the number of generations of the digital fingerprinting information based on the user information, and selecting an arbitrary position within the bit string by the determined number of generations,
Determining the number of generations of the digital fingerprinting information based on the user information,
The character string included in the user information is divided for each character, and the number of digital fingerprinting information is determined according to the number of the separated characters,
The digital fingerprinting information is a form in which a sub conversion code, a public key, and an entire conversion code are sequentially combined, and is generated for each character constituting the character string,
The sub conversion code is a conversion code for any one character constituting the character string, the entire conversion code is a conversion code for the entire character string, and the public key is a block chain of the buyer terminal based on a private key. It is generated corresponding to the address, and is located between the sub-conversion code and the entire conversion code to distinguish between the sub-conversion code and the full conversion code,
The private key is generated based on the identification information included in the user information, digital content management method using a block chain and fingerprinting.
delete delete The method of claim 1, wherein inserting the digital fingerprinting information generated based on the user information,
The digital content management method using a blockchain and fingerprinting to sequentially insert the digital fingerprinting information in a selected position according to the sequence of the character string.
delete The method of claim 1, wherein the sub conversion code and the full conversion code are
Digital using blockchain and fingerprinting, which is generated by converting any one character or the entire string into a hash value using a hash function, and encrypting the hash value using the private key. How to manage content.
delete The method of claim 1,
Extracting a plurality of the fingerprinting information included in the digital content stored in the blockchain network,
The digital content management method using a blockchain and fingerprinting further comprising determining whether the digital content is distributed without permission by analyzing the extracted plurality of fingerprinting information.
A computer-readable recording medium in which a computer program is recorded for performing a digital content management method using a block chain and fingerprinting according to any one of claims 1, 4, 6 and 8.
A user information receiving unit for receiving user information from a purchaser terminal of a purchaser who has purchased the digital content in the process of mediating an electronic transaction for digital content using a blockchain network;
A fingerprinting insertion unit for selecting at least one arbitrary position of the bit string constituting the digital content based on the user information, and inserting digital fingerprinting information generated based on the user information for each selected position; And
And a registration unit for storing the digital content into which the digital fingerprinting information is inserted in the blockchain network,
The fingerprinting inserting unit determines the number of generations of the digital fingerprinting information based on the user information, and selects an arbitrary location within the bit string by the determined number of generations, and separates the character string included in the user information by character. And, according to the number of separated characters, determine the number of generations of the digital fingerprinting information,
The digital fingerprinting information is a form in which a sub conversion code, a public key, and an entire conversion code are sequentially combined, and is generated for each character constituting the character string,
The sub conversion code is a conversion code for any one character constituting the character string, the entire conversion code is a conversion code for the entire character string, and the public key is a block chain of the buyer terminal based on a private key. It is generated corresponding to the address, and is located between the sub-conversion code and the entire conversion code to distinguish between the sub-conversion code and the full conversion code,
The private key is generated based on the identification information included in the user information, digital content management apparatus using a block chain and fingerprinting.

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