WO2020246706A1 - Dispositif de gestion d'informations de document à base de chaîne de blocs pour garantir la fiabilité d'un document et son procédé de fonctionnement - Google Patents

Dispositif de gestion d'informations de document à base de chaîne de blocs pour garantir la fiabilité d'un document et son procédé de fonctionnement Download PDF

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WO2020246706A1
WO2020246706A1 PCT/KR2020/005336 KR2020005336W WO2020246706A1 WO 2020246706 A1 WO2020246706 A1 WO 2020246706A1 KR 2020005336 W KR2020005336 W KR 2020005336W WO 2020246706 A1 WO2020246706 A1 WO 2020246706A1
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document
hash value
electronic terminal
node
code
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PCT/KR2020/005336
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English (en)
Korean (ko)
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정원석
권진혁
지준업
김기홍
이분도
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주식회사 한글과컴퓨터
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Publication of WO2020246706A1 publication Critical patent/WO2020246706A1/fr

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F21/60—Protecting data
    • G06F21/64—Protecting data integrity, e.g. using checksums, certificates or signatures
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/90—Details of database functions independent of the retrieved data types
    • G06F16/93—Document management systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/10—Protocols in which an application is distributed across nodes in the network
    • H04L67/1097—Protocols in which an application is distributed across nodes in the network for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS]

Definitions

  • the present invention relates to a document information management apparatus and a method of operation thereof that support to guarantee the reliability of a document based on a block chain.
  • Examples of such electronic document related programs include a word processor that supports basic document creation and editing, data input, arithmetic operations, spreadsheets that assist data management, and presentation programs to assist presenters' presentations.
  • any one node device among a plurality of node devices participating in the block chain network can access the previous block included in the blockchain data in which several blocks are connected in a chain.
  • a new block containing the transaction is created as a basis, the block is chained to the blockchain data, and then the block is distributed to other node devices through the blockchain network, so that predetermined data is transmitted to a plurality of nodes. It refers to a technology that enables distributed storage in devices.
  • Document information management apparatus and operation method when a registration request to a blockchain network for a first document created in the first electronic terminal device is received from a first electronic terminal device, the document for the first document
  • the identifier, the hash value, and the document version information are distributed and stored in a plurality of node devices through a blockchain network, and the first document is stored from a second electronic terminal device that has shared the first document in the first electronic terminal device.
  • the hash value stored in the plurality of node devices is searched through the blockchain network to check whether or not the first document has been modified, thereby ensuring the integrity of the document in a document sharing environment. To be guaranteed.
  • Blockchain-based document information management device for ensuring the reliability of a document according to an embodiment of the present invention is a first document from a first electronic terminal device among a plurality of electronic terminal devices.
  • an information request unit for requesting transmission of a document identifier, a hash value, and document version information for the first document to the first electronic terminal device, and the first electronic terminal device
  • a predetermined first document identifier for identifying a first document and a first hash value generated by applying data constituting the first document as input to a preset hash function and first document version information-the first 1
  • the document version information means information configured based on time information on the last storage time of the first document-When is received, the first document identifier, the first hash value, and the first document version information are included.
  • a registration request unit for transmitting a registration request of, and the first node device, when the first transaction is received from the document information management device, is based on the block chain data stored in the memory of the first node device. After creating a first block containing a first transaction, connecting the first block to the block chain data in a chain, the first block is connected to the node device among the plurality of node devices through the blockchain network. It propagates to all other node devices.
  • a method of operating a document information management device based on a block chain for ensuring the reliability of a document is created in the first electronic terminal device from a first electronic terminal device among a plurality of electronic terminal devices.
  • a registration request for a first document to a blockchain network is received, requesting the first electronic terminal device to transmit a document identifier, a hash value, and document version information for the first document
  • the first electronic terminal A first hash value and first document version information generated by applying a preset first document identifier for identifying the first document from a device and data constituting the first document as input to a preset hash function-the first 1
  • the document version information means information configured based on time information on the last storage time of the first document-When is received, the first document identifier, the first hash value, and the first document version information are included.
  • Document information management apparatus and operation method when a registration request to a blockchain network for a first document created in the first electronic terminal device is received from a first electronic terminal device, the document for the first document
  • the identifier, the hash value, and the document version information are distributed and stored in a plurality of node devices through a blockchain network, and the first document is stored from a second electronic terminal device that has shared the first document in the first electronic terminal device.
  • the hash value stored in the plurality of node devices is searched through the blockchain network to check whether or not the first document has been modified, thereby ensuring the integrity of the document in a document sharing environment. Can be guaranteed.
  • FIG. 1 is a diagram showing the structure of a block chain-based document information management apparatus for ensuring the reliability of a document according to an embodiment of the present invention.
  • FIG. 2 is a flowchart illustrating a method of operating a document information management apparatus based on a block chain for ensuring the reliability of a document according to an embodiment of the present invention.
  • each component, functional blocks or means may be composed of one or more sub-components, and the electrical, electronic, and mechanical functions performed by each component are electronic.
  • a circuit, an integrated circuit, and an application specific integrated circuit (ASIC) may be implemented with various known devices or mechanical elements, and may be implemented separately or two or more may be integrated into one.
  • the blocks of the attached block diagram and the steps in the flowchart are computer program instructions that are mounted on a processor or memory of equipment capable of processing data such as a general-purpose computer, a special-purpose computer, a portable notebook computer, and a network computer to perform specified functions It can be interpreted as meaning. Since these computer program instructions can be stored in a memory provided in a computer device or in a memory readable by a computer, the functions described in the blocks in the block diagram or in the steps in the flowchart are produced as a product containing the instruction means to perform this. It could be.
  • each block or each step may represent a module, segment, or part of code including one or more executable instructions for executing the specified logical function(s).
  • FIG. 1 is a diagram showing the structure of a block chain-based document information management apparatus for ensuring the reliability of a document according to an embodiment of the present invention.
  • the document information management apparatus 110 includes an information request unit 111, a transaction generation unit 112, and a registration request unit 113.
  • a plurality of node devices 101, 102, 103, and 104 constitute a blockchain network in order to distribute and store document information in the memory of each node device.
  • the plurality of node devices 101, 102, 103, 104 refers to a microprocessor-based computing device having a network function, and the memory of each node device includes a document identifier, hash value, and document version information of a predetermined document.
  • Blockchain data is stored in which blocks created based on a transaction containing is linked in a chain.
  • the user blocks information on the first document.
  • the first electronic terminal device 130 is the document information management device 110 As a result, a request for registration of the first document to the blockchain network can be transmitted.
  • the information requesting unit 111 receives a request for registration to the blockchain network for the first document created by the first electronic terminal device 130 from the first electronic terminal device 130 among the plurality of electronic terminal devices. Upon receipt, a request is made to the first electronic terminal device 130 to transmit a document identifier, a hash value, and document version information for the first document.
  • the first electronic terminal device 130 when the first electronic terminal device 130 receives a request for transmission of the document identifier, hash value, and document version information for the first document from the document information management device 110,
  • the data constituting the first document is applied as input to a preset hash function to generate a first hash value, and first document version information is provided based on time information on the last storage time of the first document.
  • a predetermined first document identifier for identifying the first document, a two-dimensional code including the first hash value, and the first document version information is generated to a preset area of the first page of the first document.
  • the 2D code may be inserted into the document information management device 110 and the first document identifier, the first hash value, and the first document version information may be transmitted.
  • the first document identifier means a unique identifier for identifying the first document
  • the first electronic terminal device 130 identifies the first document at a time when the first document is created by the user.
  • the first document identifier may be generated in advance.
  • the first electronic terminal device 130 when the first document identifier is generated, 1
  • the document identifier can be transmitted to the document information management device 110 to query whether it is duplicated, and the document information management device 110 includes a plurality of node devices 101, 102, 103, and 104 constituting a blockchain network.
  • An instruction indicating that the first document identifier is a unique value when it is confirmed that there is no duplicate document identifier after checking whether there is a document identifier that overlaps the first document identifier by inquiring the blockchain data stored in The message may be transmitted to the first electronic terminal device 130.
  • the first electronic terminal device 110 may finally determine the first document identifier as the document identifier for the first document.
  • the first document version information is information for classifying the storage history of the first document, and may be configured based on time information on the last storage time of the first document. For example, when the first document is last stored at 10:00 am on April 1, 2019, the first document version information is time information of'April 1, 2019 10:00 am' to a predetermined version generation function. It can be composed of an output value applied as an input and calculated. Thereafter, if the first document is re-edited and saved again at 9:00 am on May 2, 2019, the first document version information is time information of ‘9 am on May 2, 2019’ is displayed in the version. It can be reconfigured as an output value applied as an input to the generation function and calculated.
  • the first electronic terminal device 130 generates a two-dimensional code including the first document identifier, the first hash value, and the first document version information, and a preset area of the first page of the first document
  • the transaction generator 112 A first document including the first document identifier, the first hash value, and the first document version information by receiving the first document identifier, the first hash value, and the first document version information from the terminal device 130 Create a transaction.
  • the registration request unit 113 transmits the first transaction to a first node device, which is one of a plurality of node devices 101, 102, 103, and 104 constituting the block chain network. Sends a request for registration of the transaction to the blockchain network.
  • the registration request unit 113 may randomly select the first node device for transmitting the registration request to the blockchain network of the first transaction.
  • the description will be made on the assumption that the first node device is a node device indicated by reference numeral 101 in the present embodiment.
  • the first node device 101 performs the first transaction based on the blockchain data stored in the memory of the first node device 101. After creating the included first block, connecting the first block to the block chain data in a chain, the first block is connected to one of a plurality of node devices 101, 102, 103, 104 through the block chain network. It can propagate to the other node devices 102, 103, and 104 except for the first node device 101.
  • the remaining node devices 102, 103, and 104 are stored in the memory of each of the remaining node devices 102, 103, and 104.
  • the first block can be linked to data and stored in a chain.
  • the first document identifier, the first hash value, and the first document version information for the first document are stored in the memory of each of the plurality of node devices (101, 102, 103, 104). It is connected to the blockchain data in a chain and can be distributed and stored in each of a plurality of node devices 101, 102, 103, and 104.
  • the registration request unit 113 transmits the first node device 101 to the first node device 101, in the process of transmitting the registration request for the first transaction to the blockchain network.
  • a matrix storage unit 114 a syndrome generation unit 115, a feedback request unit 116, a verification syndrome generation unit 117, an authentication unit 118, and a request unit 119.
  • the matrix storage unit 114 stores a parity check matrix corresponding to a preset generation matrix having error correction capability for a code of t (t is a natural number) bit for use in authentication of a node device.
  • the parity check matrix is a matrix for verifying whether an error has occurred in the data received by the data receiving side when the data transmitting side transmits a codeword encoded based on a predetermined generation matrix to the data receiving side.
  • a generation matrix G of size kxn (k and n are natural numbers and n is a number greater than k)
  • the parity check matrix corresponding to the generation matrix G is'H'
  • the size of the parity check matrix H Is the size of (nk) xn, and has the same characteristics as in Equation 1 below in relation to the generation matrix G.
  • H T denotes a transpose matrix of the parity check matrix.
  • the data transmitting side generates the code word c using the generation matrix G and transmits it to the data receiving side
  • the data received at the data receiving side is called'r', and it is assumed that no error has occurred in the data r
  • the data r has the same characteristics as in Equation 2 below in relation to the parity check matrix H.
  • the data receiving side can detect whether an error exists in the data received at the data receiving side by using the parity check matrix.
  • 'S' in Equation 3 is called a syndrome
  • the data receiving side calculates the syndrome based on the parity check matrix H.
  • the error e included in the received data r can be found by performing syndrome decoding to find an e that satisfies a.
  • Syndrome decoding is performed only when the error correction capability of the parity check matrix is t, and when a data error occurs for bits less than t. You can find the error code e that satisfies.
  • the syndrome generator 115 randomly generates an error code having a Hamming weight t, and generates a syndrome for the error code based on the error code and the parity check matrix. Generate.
  • the Hamming weight means the number of code values of '1' in the set of code values consisting of '0' and '1'.
  • the syndrome generator 115 may generate a syndrome for the error code based on Equation 4 below.
  • e denotes an error code of hamming weight t
  • S denotes syndrome
  • the feedback request unit 116 transmits the error code to the first node device 101 and simultaneously transmits a feedback request to the first node device 101 for a codeword in which the error code is inserted as an error. do.
  • the first node device 101 stores the generation matrix in the memory of the first node device 101, and the error code and the error code from the document information management device 110
  • the feedback request is received, it is checked whether the hamming weight of the error code is t, and if it is determined that the hamming weight of the error code is t, a random code is randomly generated, and the first node device 101
  • a first codeword is generated by encoding the random code based on the generation matrix stored in a memory, and a feedback code is generated by inserting the error code as an error into the first codeword, and then the feedback code is generated. It can be transmitted to the document information management device 110.
  • the first node device 101 may first check whether the hamming weight of the error code e is t.
  • the first node device 101 determines that the error code e is a code normally generated and transmitted from the document information management device 110, and a predetermined random code After randomly generating a first codeword, the random code may be encoded based on the generation matrix stored in a memory to generate a first codeword.
  • the first node device 101 randomly generates a random code having a size of k bits and then uses the generation matrix G to use the following equation:
  • the first codeword may be generated according to the operation of 5.
  • c denotes the first codeword and r denotes the random code.
  • the first node device 101 inserts the error code e into the first codeword c as an error according to the operation of Equation 6 below to generate a feedback code. I can.
  • p means the feedback code
  • the first node device 101 may transmit the feedback code to the document information management device 110.
  • the verification syndrome generation unit 117 is the first codeword generated by the first node device 101 from the first node device 101 (the first codeword is generated by the first node device 101). If the feedback code in which the error code is inserted as an error is received in the codeword generated by encoding the generated random code based on the generation matrix previously stored in the first node device 101, the parity check matrix On the basis of, a verification syndrome is generated from the feedback code.
  • the verification syndrome generator 117 may generate the verification syndrome based on the operation of Equation 7 below. .
  • S c means the verification syndrome
  • the authentication unit 118 compares the syndrome for the error code with the verification syndrome, and when it is determined that both syndromes match each other, the authentication for the first node device 101 is completed.
  • the first Authentication for the node device 101 can be completed.
  • the first node device 101 is the document information management apparatus 110
  • An error code having a Hamming weight t issued by the document information management device 110 is inserted as an error for a codeword generated through a generation matrix having an error correction capability of t or less corresponding to the parity check matrix stored in
  • the generated feedback code may be regarded as meaning that the feedback code is fed back to the document information management device 110.
  • the generated codeword is When it is assumed that a feedback code is generated by inserting an error code having a hamming weight t issued by the document information management apparatus 110 as an error, the verification syndrome S c is calculated according to the operation of Equation Will be calculated as, Is equal to the syndrome S for the error code shown in Equation 4 above.
  • the authentication unit 118 determines that the syndrome S for the error code calculated according to Equation 4 and the verification syndrome S c calculated according to Equation 7 match each other, the first The node device 101 can be authenticated as being a normal node device registered in the system.
  • the request unit 119 transmits the first transaction to the first node device 101 and registers the first transaction in the blockchain network. Send the request.
  • the document information management apparatus 110 may further include a confirmation information request unit 120, a hash value request unit 121, and a confirmation unit 122.
  • the first electronic terminal device ( 130) in order for the user of the first electronic terminal device 130 to share the first document with other users after the registration of the first transaction in the blockchain network is completed, the first electronic terminal device ( 130) to transmit the document file for the first document into which the 2D code is inserted, to the second electronic terminal device 140, the user of the second electronic terminal device 140 You can do something to check whether it is a trusted document that has not been altered.
  • the user of the second electronic terminal device 140 can use the second electronic terminal device 140 to recognize the two-dimensional code inserted in the preset area of the first page of the first document, and When the 2D code is recognized, the second electronic terminal device 140 may transmit a request to confirm the reliability of the first document to the document information management device 110.
  • the user of the second electronic terminal device 140 prints the first document as a paper document through a printer and then transfers the two-dimensional code inserted in the preset area of the first page of the paper document to the second electronic terminal. It can be recognized through the device 140.
  • the confirmation information request unit 120 recognizes the two-dimensional code inserted in the preset area of the first page of the first document by the second electronic terminal device 140 among the plurality of electronic terminal devices. Accordingly, when a request to confirm the reliability of the first document is received from the second electronic terminal device 140, a document identifier, a hash value, and document version information for the first document are transmitted to the second electronic terminal device 140 Request.
  • the second electronic terminal device 140 when the second electronic terminal device 140 receives a request for transmission of the document identifier, hash value, and document version information for the first document from the document information management device 110, the second electronic terminal device 140 receives the first document from the 2D code.
  • the identifier, the first hash value, and the first document version information may be extracted and transmitted to the document information management apparatus 110.
  • the hash value request unit 121 extracts and transmits the first document identifier, the first hash value, and the first document version information from the two-dimensional code by the second electronic terminal device 140. 2
  • a preset first number of the plurality of node devices 101, 102, 103, 104 After randomly selecting node devices of the second electronic terminal device 140, based on the first document identifier and the first document version information, the first number of node devices are included in the first transaction. Requests transmission of the first hash value.
  • the hash value request unit 121 may transmit the first document identifier and the first document version information to the first number of node devices, and in this case, the first number of node devices By performing a search for a transaction using the first document identifier and the first document version information as a search word in the block chain data stored in the memory of a number of node devices, the first transaction after searching for the first transaction
  • the first hash value may be extracted from and transmitted to the document information management device 110.
  • the verification unit 122 When the first hash value is received from the first number of node devices, the verification unit 122 provides the first hash value received from the first number of node devices and the second electronic terminal device 140.
  • the first hash value received from the second electronic terminal device 140 is the first hash value received from node devices having a predetermined threshold number or more among the first number of node devices by comparing the received first hash value. If it is confirmed that the hash value is the same, a confirmation message indicating that the first document is a reliable document is generated and transmitted to the second electronic terminal device 140.
  • the document information management device 110 when the document information management device 110 according to the present invention receives a registration request to the blockchain network for the first document created by the first electronic terminal device 130 from the first electronic terminal device 130, the The document identifier, hash value, and document version information for the first document are distributed and stored in a plurality of node devices 101, 102, 103, 104 through a blockchain network, and the first electronic terminal device 130 1
  • a request to confirm the reliability of the first document is received from the second electronic terminal device 140 that has shared a document, it is stored in a plurality of node devices 101, 102, 103, 104 through the blockchain network.
  • the integrity of the document in the document sharing environment can be guaranteed by checking whether or not the first document has been modified by inquiring the hash value.
  • FIG. 2 is a flowchart illustrating a method of operating a document information management apparatus based on a block chain for ensuring the reliability of a document according to an embodiment of the present invention.
  • step S210 when a request for registration to the blockchain network for a first document created in the first electronic terminal device is received from a first electronic terminal device among a plurality of electronic terminal devices, the first electronic terminal device Requests transmission of document identifier, hash value, and document version information for the first document.
  • step S220 a first hash generated by applying a preset first document identifier for identifying the first document from the first electronic terminal device and data constituting the first document as input to a preset hash function
  • the first document identifier and the first hash A first transaction including a value and the first document version information is generated.
  • step S230 while transmitting the first transaction to a first node device, which is one of a plurality of node devices constituting the blockchain network, a request for registration of the first transaction to the blockchain network is transmitted. .
  • the first node device when the first transaction is received from the document information management device, the first node device generates a first block containing the first transaction based on the block chain data stored in the memory of the first node device. After generating, connecting the first block to the block chain data in a chain, the first block may be propagated to other node devices other than the node device among the plurality of node devices through the blockchain network. .
  • the first electronic terminal device when the first electronic terminal device receives a request for transmission of a document identifier, a hash value, and document version information for the first document from the document information management device, the first document The first hash value is generated by applying data constituting the hash function as an input, and the first document version information is generated based on time information on the last storage time of the first document, and then the first Generates a two-dimensional code including a document identifier, the first hash value, and the first document version information, inserts the two-dimensional code into a predetermined area of the first page of the first document, and sends the document information management device
  • the first document identifier, the first hash value, and the first document version information may be transmitted.
  • step S230 a parity check corresponding to a preset generation matrix having error correction capability for a code of t (t is a natural number) bit for use in authentication of a node device Maintaining a matrix storage unit in which a matrix is stored, when the first transaction is generated, an error code having a hamming weight of t is randomly generated, and a syndrome for the error code based on the error code and the parity check matrix Generating, transmitting the error code to the first node device and at the same time transmitting a feedback request for a codeword in which the error code is inserted as an error to the first node device, from the first node device A first codeword generated by the first node device (the first codeword is generated by encoding a random code generated by the first node device based on the generation matrix previously stored in the first node device) Codeword), when a feedback code in which the error code is inserted as an error is received, generating a verification syndrome from the feedback code
  • the first node device stores the generation matrix in the memory of the first node device, and when the error code and the feedback request are received from the document information management device, , It is checked whether the hamming weight of the error code is t, and when it is determined that the hamming weight of the error code is t, the random code is randomly generated, and the random code is stored in the memory of the first node device.
  • the first codeword is generated by encoding the random code based on a generation matrix, and after generating the feedback code by inserting the error code into the first codeword as an error, the feedback code is transferred to the document information management device Can be transferred to.
  • the method of operating the document information management device is, after the registration of the first transaction to the blockchain network is completed, a second electronic terminal device among the plurality of electronic terminal devices is Upon recognizing the two-dimensional code inserted in the preset area of the first page of the first document and receiving a request to confirm the reliability of the first document from the second electronic terminal device, the second electronic terminal Requesting transmission of a document identifier, a hash value, and document version information for the first document to a device, wherein the second electronic terminal device provides the first document identifier, the first hash value, and the first document version information from the two-dimensional code.
  • a preset second among the plurality of node devices is After randomly selecting one number of node devices, they are included in the first transaction with the first number of node devices based on the first document identifier and the first document version information received from the second electronic terminal device.
  • the step of generating a confirmation message indicating that the first document is a reliable document and transmitting the message to the second electronic terminal device may be further included.
  • the method of operating a document information management apparatus based on a block chain for ensuring the reliability of a document according to an embodiment of the present invention is a document information management device based on a block chain to ensure the reliability of the document described with reference to FIG. 1 Since it may correspond to the configuration of the operation of 110, a more detailed description thereof will be omitted.
  • the method of operating a document information management apparatus based on a block chain for ensuring the reliability of a document may be implemented as a computer program stored in a storage medium for execution through a combination with a computer.
  • a method of operating a document information management device based on a block chain to ensure the reliability of a document is implemented in the form of program commands that can be executed through various computer means and recorded in a computer-readable medium.
  • the computer-readable medium may include program instructions, data files, data structures, and the like alone or in combination.
  • the program instructions recorded in the medium may be specially designed and configured for the present invention, or may be known and usable to those skilled in computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tapes, optical media such as CD-ROMs and DVDs, and magnetic media such as floptical disks.
  • program instructions such as magneto-optical media, and ROM, RAM, flash memory, and the like.
  • 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.

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Abstract

L'invention concerne un dispositif de gestion d'informations de document à base de chaîne de blocs pour garantir la fiabilité d'un document, et son procédé de fonctionnement. Selon la présente invention, le dispositif de gestion d'informations de document et le procédé de fonctionnement de celui-ci peuvent garantir l'intégrité d'un document dans un environnement de partage de document par les étapes consistant à, lors de la réception, depuis un premier dispositif de terminal électronique, d'une demande d'enregistrement à un réseau de chaîne de blocs pour un premier document créé par un premier dispositif de terminal électronique, distribuer et stocker un identifiant de document, d'une valeur de hachage, et d'informations de version de document pour le premier document dans une pluralité de dispositifs de nœud par l'intermédiaire du réseau de chaîne de blocs, et lors de la réception d'une demande pour confirmer la fiabilité du premier document à partir d'un second dispositif de terminal électronique qui a partagé le premier document avec le premier dispositif de terminal électronique, confirmer si une modification s'est produite dans le premier document par vérification de la valeur de hachage stockée dans la pluralité de dispositifs de nœud par l'intermédiaire du réseau de chaîne de blocs.
PCT/KR2020/005336 2019-06-04 2020-04-22 Dispositif de gestion d'informations de document à base de chaîne de blocs pour garantir la fiabilité d'un document et son procédé de fonctionnement WO2020246706A1 (fr)

Applications Claiming Priority (2)

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KR10-2019-0065950 2019-06-04
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