JP6557177B2 - Processing system and processing method - Google Patents

Description

  The present invention relates to a processing method and a processing system used in a processing system including a transaction issuing terminal that issues transaction data, and a block generation terminal that generates block data including transaction data and connects to block chain data.

  In recent years, a platform for a distributed system that implements a blockchain technology has been proposed (see, for example, Non-Patent Document 1), and has begun to be used not only for virtual currency but also for recording various information and distributing assets. The block chain technology is a technology that enables information synchronization between participants under a condition that malicious participants are within a certain ratio in a network constituted by a plurality of participants. The information held by the participants has a structure in which block data is connected in a chain, and is called a block chain. There is a dependency relationship between the block data, and furthermore, since it is necessary to satisfy a specific condition for the generation of the block data, the past block data becomes more difficult to falsify. In the block data, transaction data (including transaction information) issued to the block chain network is collected. The block chain functions as one huge ledger shared by participants in a P2P (Peer To Peer) network.

  In the blockchain mechanism, the generation of block data is not performed by a specific participant. Of the participants participating in the maintenance of the blockchain network, only those who satisfy certain conditions can generate block data. Participants participating in the maintenance of the blockchain network verify each transaction data issued to the blockchain network, and start generating block data by combining a plurality of transactions. There are predetermined conditions for generating block data, and participants compete to search for block data that satisfies the conditions. A participant who has been able to generate block data that satisfies the conditions transmits the found block data to other participants and adds the block data to his block chain. The received participant verifies the transaction data stored in the block data, verifies the generation condition of the block data, etc., confirms that there is no fraud, and connects it to the block chain of its own.

  Here, specific confidential information may be set as transaction data instead of virtual currency transaction information. The exchange of specific confidential information may be managed by a blockchain ledger and referred to by a specific partner. Even if this secret information is temporarily exchanged information, it is managed in the ledger for a long time according to the block chain mechanism.

DR. GAVIN WOOD, "ETHEREUM: A SECURE DECENTRALISED GENERALISED TRANSACTION LEDGER HOMESTEAD DRAFT", [online], [Search May 18, 2016], Internet <URL: http://gavwood.com/paper.pdf>

  However, when specific confidential information is set as transaction data, the confidential information is managed in the ledger for a long period of time. Therefore, even if the key used to encrypt the confidential information leaks, the data on the blockchain cannot be deleted or updated, and the confidential information may be referred to by an unexpected third party. .

  Therefore, development of a mechanism capable of temporarily holding transaction information in the blockchain mechanism is expected.

  Accordingly, an object of the present invention is to provide a processing method and a processing system capable of temporarily holding transaction information in a block chain mechanism.

  In order to solve the above problem, a first feature of the present invention is that a transaction issuing terminal that issues transaction data, a transaction based on the transaction data, block data including the transaction data, and block chain data are generated. The present invention relates to a processing system provided with a block generation terminal connected to. In the processing system according to the first aspect of the present invention, the transaction issuing terminal has registration means for transmitting registration transaction data including display data. When the block generation terminal receives the registration transaction data, the block generation terminal deletes the display data from the registration transaction data, generates long-term storage data corresponding to the display data, and sets the display data as store data, and the long-term storage data And a block generation unit that connects the generated block data to the block chain data and transmits the display data and the generated block data.

  The transaction issuing terminal may further include deletion means for transmitting deletion transaction data for deleting display data when requesting deletion of display data. In the block generation terminal, when the transaction processing means receives the deletion transaction data, the transaction processing means deletes the display data from the store data, and the block generation means generates block data including the deletion transaction data, and the generated block data is transferred to the block chain. The generated block data is transmitted together with the data.

  The transaction issuing terminal may further include key update means for transmitting key update transaction data including the identifier of the display data and the new encryption key when requesting the update of the encryption key of the display data. In the block generation terminal, when the transaction processing means receives the key update transaction data, it encrypts the display data with a new public key, generates updated display data, and updates updated long-term storage data corresponding to the updated display data. The display data of the store data is updated to the updated display data, and the block generation means generates block data including the updated long-term storage data, and connects the generated block data to the block chain data At the same time, the generated block data is transmitted.

  According to a second aspect of the present invention, there is provided a transaction issuing terminal that issues transaction data, a block generation terminal that processes a transaction based on the transaction data, generates block data including the transaction data, and connects the block data to the block chain data. The present invention relates to a processing method used in a processing system provided. According to a second aspect of the present invention, there is provided a processing method in which a transaction issuing terminal transmits registered transaction data including display data, a block generating terminal receives registered transaction data, and a block generating terminal , Deleting the display data from the registered transaction data, generating a long-term storage data corresponding to the display data, a block generation terminal setting the display data as store data, and a block generation terminal A block generating terminal including the step of generating the block data, and the block generating terminal connecting the generated block data to the block chain data and transmitting the display data and the generated block data.

  In the step of generating long-term storage data, the block generation terminal further generates verification data for confirming the correspondence between the display data and the long-term storage data, and in the step of setting the display data to store data, the block generation terminal Further, the verification data may be set as store data.

When the transaction issuing terminal requests deletion of the display data, the transaction issuing terminal transmits deletion transaction data for deleting the display data, and the block generation terminal receives the deletion transaction data; The block generation terminal deletes the display data from the store data, the block generation terminal generates block data including the deletion transaction data, and the block generation terminal concatenates the generated block data to the block chain data. In addition, a step of transmitting the generated block data may be further included.

  In the step of generating long-term storage data, the block generation terminal further generates verification data for confirming the correspondence between the display data and the long-term storage data, and in the step of setting the display data to store data, the block generation terminal Furthermore, the block generation terminal may further delete the verification data from the store data in the step of setting the verification data as the store data and deleting the display data from the store data.

  When the transaction issuing terminal requests to update the encryption key of the display data, the transaction issuing terminal transmits key update transaction data including the identifier of the display data and the new encryption key, and the block generation terminal Receiving the key update transaction data, the block generating terminal encrypting the display data with a new public key to generate updated display data, and the block generating terminal corresponding to the updated display data A step of generating post-update long-term storage data, a block generation terminal updating display data of the store data to post-update display data, and a block generation terminal generating block data including the post-update long-term storage data Block and the block generation terminal While connected to Ndeta it may further comprise the step of transmitting the generated block data.

  According to the present invention, it is possible to provide a processing method and a processing system capable of temporarily holding transaction information in a block chain mechanism.

It is a figure explaining the system configuration | structure of the processing system which concerns on embodiment of this invention. It is a figure explaining the hardware constitutions and functional block of the transaction issuing terminal which concern on embodiment of this invention. It is a figure explaining the hardware constitutions and functional block of the block generation terminal which concerns on embodiment of this invention. It is a figure explaining the hardware constitutions and functional block of the block verification terminal which concern on embodiment of this invention. It is a figure explaining the relationship between the display data which concern on embodiment of this invention, and long-term storage data. It is a sequence diagram explaining the registration process which concerns on embodiment of this invention. It is a figure explaining registration transaction data concerning an embodiment of the invention. It is a figure explaining block chain data concerning an embodiment of the invention. It is a figure explaining the data which the block generation terminal which concerns on embodiment of this invention transmits. It is a sequence diagram explaining the deletion process which concerns on embodiment of this invention. It is a sequence diagram explaining the key update process which concerns on embodiment of this invention.

  Next, embodiments of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals.

(Processing system)
As shown in FIG. 1, the processing system 10 according to the embodiment of the present invention includes a plurality of computers, and each computer is autonomously distributed via a communication control device and a P2P network N provided in each computer. It is connected to the. Note that the number of computers connected in the processing system 10 illustrated in FIG. 1 is an example, and is not limited thereto.

  A program for realizing a transaction in a digital virtual currency or the like is installed in each computer constituting the processing system 10. Each computer holds block chain data B and store data A, respectively. Each computer obtains block data D and store data A by acquiring transaction data T and block data D generated from transaction data T and linked to block chain data B via the P2P network N. Update. The entire terminal group participating in the P2P network N monitors fraud and shares only the block chain data B and the store data A. Here, the transaction issuing terminal 1 may also hold the block chain data B and the store data A.

  Each computer functions as the transaction issuing terminal 1, functions as the block generation terminal 2, or functions as the block verification terminal 3 according to the role in each scene in the processing system 10. Here, there may be a terminal that functions as the transaction issuing terminal 1 without functioning as the block generation terminal 2 and the block verification terminal 3, or the block generation terminal 2 and the block verification terminal 3 without functioning as the transaction issuing terminal 1. There may be terminals that only function as.

  The transaction issuing terminal 1, the block generating terminal 2, and the block verification terminal 3 are operated by an issuer, a generator, and a verifier, respectively. When the transaction issuing terminal 1, the block generation terminal 2, and the block verification terminal 3 sign, the signatures of the issuer, the generator, and the verifier are used, respectively.

  The transaction issuing terminal 1 is a terminal that issues a transaction. The transaction issuing terminal 1 transmits the transaction data T to the P2P network N. In the embodiment of the present invention, the transaction issuing terminal 1 issues a transaction relating to information to be temporarily stored.

  The block generation terminal 2 processes a transaction issued by the transaction issuing terminal 1 or the like, generates block data D, concatenates the generated block data D to the existing block chain data B, and updates the store data A. . The block generation terminal 2 transmits the transaction data T and the generated block data D to the P2P network N.

  Note that, in the processing system 10, generation of blocks is attempted in a plurality of terminals. In the embodiment of the present invention, a case will be described in which the block generation terminal 2 generates block data earlier than other terminals.

  The block verification terminal 3 verifies the block data D transmitted from the block generation terminal 2, and updates the block chain data B stored in its own storage device if it can be verified. In particular, the block verification terminal 3 according to the embodiment of the present invention verifies not only the block chain data B but also the store data A, and updates the store data stored in its own storage device when it can be verified. Further, the block verification terminal 3 requests the store data A from the block generation terminal 2 as necessary, and acquires the latest store data A.

(Configuration of each terminal)
The transaction issuing terminal 1, the block generation terminal 2, and the block verification terminal 3 will be described with reference to FIGS. The transaction issuing terminal 1, the block generation terminal 2, and the block verification terminal 3 are general computers including storage devices 110, 210, 310, processing devices 120, 220, 320, communication control devices 130, 230, 330, and the like. The transaction issuing terminal 1, the block generation terminal 2, and the block verification terminal 3 each implement the functions shown in FIGS. 2 to 4 by a general computer executing a program for executing a predetermined process. .

(Transaction issuing terminal)
The storage device 110 of the transaction issuing terminal 1 stores display data M and transaction data T. Although not shown, the storage device 110 may store block chain data B and store data A.

  The display data M is, for example, data in which confidential information (target data) is concealed, and only a specific person can understand the meaning of the confidential information. The transaction data T is data related to a transaction for executing registration, deletion or key update of the display data M. In the embodiment of the present invention, the transaction data T includes registration transaction data TR, deletion transaction data TD, and key update transaction data TK. The transaction data T may be deleted after the transaction is issued.

  The processing device 120 of the transaction issuing terminal 1 includes a registration unit 121, a deletion unit 122, and a key update unit 123.

  The registration unit 121 transmits registration transaction data TR including the display data M. For example, the registration unit 121 encrypts or hashes the target data, which is confidential information, to generate display data M whose meaning is not understood by a third party. The registration unit 121 generates registration transaction data TR including the display data M and transmits it to the P2P network N. The block generation terminal 2 that has received the registration transaction data TR registers data based on the display data M (long-term storage data L described later) in the block data D and registers the display data M in the store data A.

  Here, the display data M is data temporarily stored in the P2P network N. The display data M may be data obtained by concealing predetermined target data, may be metadata of the predetermined target data, and the display data M may be any data. The display data M may be deleted from the P2P network N by the deletion transaction data TD, or may be further concealed by the key update transaction data TK.

  The present invention can prevent the block chain data B from being enlarged by registering the display data M in the data store A outside the block chain data B. As a result, in the embodiment of the present invention, as the display data M, large volume data such as long text data and image or video data can be temporarily stored in the P2P network N. .

  When the deletion unit 122 requests deletion of the display data M, the deletion unit 122 transmits deletion transaction data TD for deleting the display data M. The deletion unit 122 generates deletion transaction data TD including the identifier of the display data M and transmits it to the P2P network N. The block generation terminal 2 that has received the deletion transaction data TD deletes the display data M from the store data A. The issuer deletes the deletion transaction data TD in order to delete the display data M when the key used to generate the display data M is leaked or when the sharing of the display data M with the P2P network N is terminated. Is used.

  When the key update unit 123 requests to update the encryption key of the display data M, the key update unit 123 transmits key update transaction data TK including the identifier of the display data M and a new encryption key. If the display data M encrypted with the old key is included in the store data A, the key update unit 123 generates key update transaction data TK and transmits it to the P2P network N. The block generation terminal 2 that has received the key update transaction data TK further encrypts the display data M encrypted with the old key with the new public key to generate updated display data M ′, and updates the updated display data. M ′ is registered in the store data A.

  If the issuer has released the key used to generate the display data M, but wishes to continue sharing the display data M in the P2P network N, the issuer can use the key to further encrypt the display data M. Update transaction data TK is used. With the key update transaction data TK, the display data M of the store data A is updated to the updated display data M ′ encrypted with the new public key.

(Block generation terminal)
The storage device 210 of the block generation terminal 2 stores transaction data T, block chain data B, and store data A.

  The transaction data T is transaction data transmitted from the transaction issuing terminal 1 or the like. In the embodiment of the present invention, the transaction data T includes registration transaction data TR, deletion transaction data TD, and key update transaction data TK.

  The block chain data B and the store data A are data shared by the P2P network N. In the embodiment of the present invention, the block chain data B includes permanently stored data (long-term storage data L in the present invention). Here, the block chain data B does not include temporarily stored data (display data M in the present invention).

  Store data A includes temporarily stored data (display data M corresponding to long-term storage data L). Store data A may include a set in which display data M is associated with an identifier of display data M, and store data A may include a plurality of sets.

  The processing device 220 of the block generation terminal 2 includes a transaction processing unit 221, a block generation unit 222, and a synchronization unit 223.

  The transaction processing means 221 receives and processes the registration transaction data TR, the deletion transaction data TD, and the key update transaction data TK transmitted by the transaction issuing terminal 1.

  When receiving the registered transaction data TR, the transaction processing means 221 deletes the display data M from the registered transaction data, generates long-term storage data L corresponding to the display data M, and sets the display data M to the store data A. Here, the transaction processing unit 221 may generate the registered transaction data TR ′ by replacing the display data M of the registered transaction data TR with the long-term storage data L.

  When the transaction processing unit 221 receives the deletion transaction data TD, the transaction processing unit 221 deletes the display data M from the store data A.

  When the transaction processing means 221 receives the key update transaction data TK, the transaction processing means 221 encrypts the display data M with a new public key to generate updated display data M ′, and the updated long-term data corresponding to the updated display data M ′. Saved data L ′ is generated, and the display data M of the store data S is updated to the updated display data M ′. The transaction processing unit 221 may set the updated long-term storage data L ′ in the key update transaction data TK.

  The block generation unit 222 attempts to generate a block that satisfies a predetermined condition after the transaction processing unit 221 processes each transaction. This predetermined condition is Proof of Work (PoW), Proof of Stake (PoS), or the like. When the block generation unit 222 succeeds in generating the block, the generated block is transmitted to the P2P network N.

  When the transaction processing unit 221 processes the registration transaction data TR, the block generation unit 222 generates block data D including the long-term storage data L, and the block data D including the registration transaction data TR ′ is converted into the block chain data B. Connect to Further, the block generation unit 222 transmits the display data M and the block data D including the registration transaction data TR ′.

  In the embodiment of the present invention, the transaction processing unit 221 generates registration transaction data TR ′ in which the display data M is replaced with the long-term storage data L, and the block generation unit 222 includes the registration transaction data including the long-term storage data L. Although the case where TR ′ is transmitted will be described, the present invention is not limited to this. The block generation unit 222 may include the registration transaction data obtained by deleting the display data M from the registration transaction data TR in the block data D and may include the long-term storage data L in the header of the block data D. As another example, when the block data D includes a header part, a transaction holding part that holds each transaction data, and a data holding part that holds data other than the transaction data, the long-term storage data L is stored in the data holding part. And data indicating that the long-term storage data L is held in the data holding unit may be stored in the header part.

  When the transaction processing unit 221 processes the deletion transaction data TD, the block generation unit 222 generates block data D including the deletion transaction data TD, and converts the block data D including the deletion transaction data TD into the block chain data B. Link. Further, the block generation unit 222 transmits block data D including the deletion transaction data TD.

  When the transaction processing unit 221 processes the key update transaction data TK, the block generation unit 222 generates block data including the updated long-term storage data L ′ and generates block data D including the updated long-term storage data L ′. The block data D is linked to the block chain data B, and the block data D including the updated long-term storage data L ′ is transmitted.

  In the embodiment of the present invention, the transaction processing unit 221 generates key update transaction data TK ′ including the updated long-term storage data L ′, and the block generation unit 222 includes block data including the key update transaction data TK ′. Although the case where D is transmitted will be described, the present invention is not limited to this. The block generation unit 222 may include the key update transaction data not including the updated long-term storage data L ′ in the block data D, and may include the updated long-term storage data L ′ in the header of the block data D. . As another example, when the block data D includes a header part, a transaction holding part that holds each transaction data, and a data holding part that holds data other than transaction data, the updated long-term storage data L ′ is While storing in the data holding unit, data indicating that the updated long-term storage data L ′ is held in the data holding unit may be stored in the header part.

  The synchronization means 223 acquires the block chain data B and the store data A from the P2P network N, and holds the latest block chain data B and store data A in the block generation terminal 2.

(Block verification terminal)
The storage device 310 of the block verification terminal 3 stores block chain data B and store data A.

  The block chain data B and the store data A are data shared by the P2P network N as described in the block generation terminal 2. In the embodiment of the present invention, the block chain data B includes permanently stored data (long-term storage data L in the present invention), and the store data A includes display data M corresponding to the long-term storage data L. .

  The processing device 320 of the block verification terminal 3 includes verification means 321 and synchronization means 322.

  The verification unit 321 receives the block data D from the block generation terminal 2 and verifies the validity of the block data D. Furthermore, when the block data D is verified, the verification unit 321 connects the block data D to the block chain data B. The verification unit 321 further receives the display data M and verifies the validity of the store data A.

  The synchronization unit 322 acquires the block chain data B and the store data A from the P2P network N as described in the block generation terminal 2, and holds the latest block chain data B and store data A in the block verification terminal 3.

(Display data and long-term storage data)
In the embodiment of the present invention, the display data M is, for example, data obtained by concealing confidential information (target data), registered in the store data A by the registered transaction data TR, and stored data A by the deleted transaction data TD. Deleted from. On the other hand, the long-term storage data L corresponds to the display data M, is data that further secures the display data M, and is permanently stored in the block chain data B.

  As shown in pattern 1 and pattern 2 in FIG. 5, the display data M and the long-term storage data L are data that are paired with each other via the verification data K. In the pattern 1, the display data M is data obtained by encrypting or hashing confidential information, whereas the verification data K is a random number having a large digit, and the long-term storage data L is obtained by adding the verification data K to the display data M. This is the hash value of the added data. In the pattern 2, the display data M is data obtained by encrypting or hashing the confidential information, while the long-term storage data L and the verification data K are each a fragment of the display data M that is secretly distributed.

  Further, as shown in pattern 3 in FIG. 5, the display data M and the long-term storage data L may be paired data without using the verification data K. In pattern 3, the display data M is metadata or encrypted confidential information, and the long-term storage data L is a hash value of the display data M.

  As shown in FIG. 5, the verification data K is data that associates the display data M with the long-term storage data L, and is arbitrarily generated. For example, when the registration transaction data TR is processed, if the display data M and the long-term storage data L have a correspondence relationship of the pattern 1 or the pattern 2, the verification data K is also generated when the long-term storage data L is generated. . When the display data M and the long-term storage data L have the correspondence relationship of the pattern 3, the verification data K is not generated. The same applies to the case of processing the key update transaction data TK.

  The pattern shown in FIG. 5 is an example, and the present invention is not limited to this.

(Registration method)
With reference to FIG. 6, a process when the transaction issuing terminal 1 transmits the registered transaction data TR will be described.

  First, in step S101, the transaction issuing terminal 1 generates registration transaction data TR. As shown in FIG. 7A, the registration transaction data TR includes data obtained by giving the issuer's electronic signature to the display data M, and data obtained by giving the issuer's electronic signature to other data. Here, the display data M is data obtained by encrypting or hashing confidential information. The other data is the registration transaction data TR, such as confidential instruction data indicating temporary storage of confidential information, and public key data. As shown in FIG. 7C, in a general transaction, an electronic signature of an issuer is assigned to all data. The registration transaction according to the embodiment of the present invention includes display data M, The difference is that an electronic signature is assigned to data other than the above.

  When the registration transaction data TR is generated in step S101, the transaction issuing terminal 1 transmits the registration transaction data TR to the P2P network N, and the block generation terminal 2 receives the registration transaction data TR.

  When receiving the registration transaction data TR, the block generation terminal 2 verifies the validity of the registration transaction data TR in step S111. In addition to the normal transaction verification, the block generation terminal 2 confirms that the display data M of the registered transaction data TR and other data are signed by the same issuer.

  When the validity of the registered transaction data TR is confirmed, the block generation terminal 2 generates long-term storage data L from the display data M in step S112. At this time, the block generation terminal 2 also generates verification data K as necessary. The long-term storage data L and the verification data K are generated based on the pattern described with reference to FIG.

  In step S113, the block generation terminal 2 gives the creator's signature to the long-term storage data L generated in step S112. Further, as shown in FIG. 7B, the block generation terminal 2 deletes the display data M and the issuer's signature from the registration transaction data TR acquired in step S102, and replaces them with the long-term storage data L and the generator's signature. Then, registration transaction data TR ′ is generated.

  In step S114, the block generation terminal 2 inserts the display data M into the store data A. At this time, the block generation terminal 2 may be inserted into the store data A in association with the identifier of the display data M. The display data M is data generated by the transaction issuing terminal 1 and is set in the registered transaction data TR. When the verification data K is also generated in step S112, the block generation terminal 2 inserts the verification data K into the store data A.

  In step S115, the block generation terminal 2 generates a digest of the store data A, and generates a header of the block data D of the Nth block to be newly generated. As shown in FIG. 8, the header of the block data D of the Nth block includes (1) a hash value of the previous block (N−1), (2) a digest of the transaction stored in the block, and (3) store data A. Including a digest of (2) The digest of the transaction stored in the block includes the digest of the registered transaction data TR ′ generated in step S113.

  In step S116, the block generation terminal 2 tries to generate block data D including registration transaction data TR '. When the block generation terminal 2 succeeds in generating the block data D here, the block generation terminal 2 updates the block chain data B by connecting the block data D generated in step S116 to the block chain data B in step S117. .

  In step S118, the block generation terminal 2 transmits the block data D generated in step S116 and the display data M with the signature of the issuer to the P2P network N as shown in FIG. When the verification data K is also generated in step S112, the block generation terminal 2 also transmits the verification data K.

  When the block verification terminal 3 receives the block data D and the display data M with the signature of the issuer, the block verification terminal 3 verifies the block chain data B and the store data A held by the block verification terminal 3 in steps S121 and S122. The block verification terminal 3 confirms that the long-term storage data L included in the registration transaction data TR ′ included in the block data D is associated with the display data M. When verification data is also generated in step S112, the block verification terminal 3 also refers to the verification data K and confirms that it is associated. The block verification terminal 3 updates the store data A of the block generation terminal 2 based on the received display data M, the digest of the store data A after the update, and the digest of the store data in the header of the received block data D It is determined whether or not. Further, the block verification terminal 3 confirms that the issuer of the registration transaction data TR ′ has given the electronic signature of the display data.

  When the block verification terminal 3 determines that the block chain data B and the store data A stored therein are not the latest data as a result of the verification, in step S123, the block verification terminal 3 inquires the P2P network N, The latest block chain data B and store data A are acquired.

(How to delete)
With reference to FIG. 10, a process when the transaction issuing terminal 1 transmits the deletion transaction data TD will be described.

  First, in step S201, the transaction issuing terminal 1 generates deletion transaction data TD. The deletion transaction data TD includes an identifier of display data M to be deleted.

  When the deletion transaction data TD is generated in step S201, the transaction issuing terminal 1 transmits the deletion transaction data TD to the P2P network N in step S202, and the block generation terminal 2 receives the deletion transaction data TD.

  When receiving the deletion transaction data TD, the block generation terminal 2 verifies the validity of the deletion transaction data TD. When the validity can be verified, the block generation terminal 2 deletes the display data M specified by the identifier included in the deletion transaction data TD from the store data A in step S211. If there is verification data K corresponding to the display data M, the block generation terminal 2 also deletes the verification data K.

  Step S212 The block generation terminal 2 generates a digest of the store data A, and generates a header of the block data D of the Nth block to be newly generated. As shown in FIG. 8, the header of the block data D of the Nth block includes (1) the hash value of the previous block (N−1), (2) the digest of the transaction stored in the block, and (3) store data. Includes the digest of A. In the deletion method, (2) the digest of the transaction stored in the block includes the digest of the deletion transaction data TD received in step S202.

  In step S213, the block generation terminal 2 tries to generate block data D including the deletion transaction data TD. When the block generation terminal 2 succeeds in generating the block data D, the block generation terminal 2 updates the block chain data B by connecting the block data D generated in step S213 to the block chain data B in step S214. .

  In step S215, the block generation terminal 2 transmits the block data D generated in step S213 to the P2P network N.

  When receiving the block data D and the like, the block verification terminal 3 verifies the block chain data B and the store data A held by the block verification terminal 3 in steps S221 and S222. The block verification terminal 3 deletes the display data M specified by the identifier of the deletion transaction data TD from the store data A, updates the store data A, the digest of the store data A after the update, and the received block data It is determined whether or not the digests of the store data in the header of D match.

  If the block verification terminal 3 determines that the block chain data B and the store data A stored therein are not the latest data as a result of the verification, in step S223, the block verification terminal 3 inquires the P2P network N, The latest block chain data B and store data A are acquired.

(Key update method)
With reference to FIG. 10, a process when the transaction issuing terminal 1 transmits the key update transaction data TK will be described.

  First, in step S301, the transaction issuing terminal 1 generates key update transaction data TK. The key update transaction data TK includes the identifier of the display data M that is the key update target and the updated public key of the issuer.

  When the key update transaction data TK is generated in step S301, the transaction issuing terminal 1 transmits the key update transaction data TK to the P2P network N in step S302, and the block generation terminal 2 receives the key update transaction data TK.

  When receiving the key update transaction data TK, the block generation terminal 2 verifies the validity of the key update transaction data TK. If the validity can be verified, in step S311, the display data M identified by the identifier included in the key update transaction data TK is extracted from the store data A, and the extracted display data M is updated with the updated public key. The updated display data M ′ is generated by encryption.

  In step S312, the block generation terminal 2 generates updated long-term storage data L 'from the updated display data M'. At this time, the block generation terminal 2 also generates post-update verification data K ′ as necessary.

  In step S313, the block generation terminal 2 sets the updated long-term storage data L ′ generated in step S312 to the key update transaction data TK acquired in step S302, and generates key update transaction data TK ′.

  In step S314, the block generation terminal 2 inserts the updated display data M ′ into the store data A. When the updated verification data K ′ is also generated in step S <b> 312, the block generation terminal 2 also inserts the updated verification data K ′ into the store data A.

  In step S315, the block generation terminal 2 generates a digest of the store data A, and generates a header of the block data D of the Nth block to be newly generated. As shown in FIG. 8, the header of the block data D of the Nth block includes (1) the hash value of the previous block (N−1), (2) the digest of the transaction stored in the block, and (3) store data. Includes the digest of A. In the key update method, (2) the digest of the transaction stored in the block includes the digest of the key update transaction data TK ′ generated in step S313.

  In step S316, the block generation terminal 2 tries to generate a block including the key update transaction data TK ′. When the block generation terminal 2 succeeds in generating the block, that is, when the block data D is generated, the block generation terminal 2 concatenates the block data D generated in step S316 to the block chain data B in step S317, and Update blockchain data B.

  In step S318, the block generation terminal 2 transmits the block data D generated in step S316 to the P2P network N. When the updated verification data K ′ is also generated in step S312, the block generation terminal 2 also transmits the updated verification data K ′.

  When receiving the block data D and the like, the block verification terminal 3 verifies the block chain data B and the store data A held by the block verification terminal 3 in steps S321 and S322. The block verification terminal 3 reads the key update transaction data TK ′ of the block data D received from the block generation terminal 2, and acquires the identifier of the display data M and the updated public key. The block verification terminal 3 acquires the display data M from the store data 3 and encrypts it with the public key, generates updated display data M ′, and inserts it into the store data A. The block verification terminal 3 confirms that the updated long-term storage data L ′ included in the key update transaction data TK ′ included in the block data D and the updated display data M ′ of the store data A are linked. When the updated verification data K ′ is also generated in step S <b> 312, the block verification terminal 3 also refers to the updated verification data K ′ and confirms that it is linked. The block verification terminal 3 determines whether or not the digest of the updated store data A matches the digest of the store data in the received header of the block data D.

  If the block verification terminal 3 determines that the block chain data B and the store data A stored therein are not the latest data as a result of the verification, in step S323, the block verification terminal 3 inquires the P2P network N and The latest block chain data B and store data A are acquired.

  In the example shown in FIG. 11, the case where the updated long-term storage data L ′ is set as the key update transaction data TK ′ has been described. The updated long-term storage data L ′ may be shared by the P2P network N as the block chain data B and may be in any format.

  Thus, in the processing method according to the embodiment of the present invention, when the display data M in which the confidential information is concealed is registered in the block chain data B, the display data M is set in the store data A outside the block chain data B. At the same time, the long-term storage data L corresponding to the display data M is stored in the block chain data B. Further, by issuing a transaction for deleting the display data M, the display data M can be deleted from the store data A without changing the long-term storage data L stored in the block chain data B. Accordingly, it is possible to suppress the disadvantage caused by the outflow of the key at the time of creating the display data M, and to temporarily hold the display data M by utilizing the block chain mechanism.

  As described above, according to the embodiment of the present invention, transaction information can be temporarily held in a block chain mechanism.

(Other embodiments)
As described above, the embodiments of the present invention have been described. However, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples, and operational techniques will be apparent to those skilled in the art.

  For example, the transaction issuing terminal, block generation terminal, and block verification terminal described in the embodiment of the present invention may be configured on one piece of hardware as shown in FIGS. You may comprise on several hardware according to a number. Moreover, you may implement | achieve on the existing information processing apparatus.

  It goes without saying that the present invention includes various embodiments not described herein. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.

DESCRIPTION OF SYMBOLS 1 Transaction issuing terminal 2 Block generation terminal 3 Block verification terminal 10 Processing system 110, 210, 310 Storage device 120, 220, 320 Processing device 121 Registration means 122 Deletion means 123 Key update means 130, 230, 330 Communication control device 221 Transaction processing Means 222 Block generation means 223, 322 Synchronizing means 321 Verification means A Store data B Block chain data D Block data K Verification data K ′ Updated verification data L Long-term storage data L ′ Updated long-term storage data M Display data M ′ After update Display data N P2P network T Transaction data TD Delete transaction data TR Registration transaction data

Claims (8)

A processing system comprising: a transaction issuing terminal that issues transaction data; and a block generation terminal that processes a transaction based on the transaction data, generates block data including the transaction data, and connects to block chain data.
The transaction issuing terminal is
Having registration means for transmitting registration transaction data including display data;
The block generation terminal
When receiving the registration transaction data, transaction processing means for deleting the display data from the registration transaction data, generating long-term storage data corresponding to the display data, and setting the display data as store data;
A processing system comprising block generation means for generating block data including the long-term storage data, connecting the generated block data to block chain data, and transmitting the display data and the generated block data . The transaction issuing terminal is
A deletion means for transmitting deletion transaction data for deleting the display data when requesting deletion of the display data;
In the block generation terminal,
When the transaction processing means receives the deletion transaction data, the transaction processing means deletes the display data from the store data,
The block generation unit generates block data including the deletion transaction data, concatenates the generated block data to block chain data, and transmits the generated block data. Processing system. The transaction issuing terminal is
A key update means for transmitting key update transaction data including an identifier of the display data and a new encryption key when requesting an update of the encryption key of the display data;
In the block generation terminal,
When receiving the key update transaction data, the transaction processing means encrypts the display data with a new public key , generates updated display data, and stores updated long-term storage data corresponding to the updated display data. Generating, updating the display data of the store data to the updated display data,
The block generation unit generates block data including the updated long-term storage data, connects the generated block data to the block chain data, and transmits the generated block data. The processing system according to 1 or 2. Processing used in a processing system comprising a transaction issuing terminal that issues transaction data, and a block generation terminal that processes a transaction based on the transaction data, generates block data including the transaction data, and connects the block data to block chain data A method,
The transaction issuing terminal transmitting registration transaction data including display data;
The block generation terminal receiving the registration transaction data;
The block generation terminal deleting the display data from the registration transaction data, and generating long-term storage data corresponding to the display data;
The block generation terminal sets the display data to store data;
The block generation terminal generating block data including the long-term storage data;
The block generation terminal includes a step of connecting the generated block data to block chain data and transmitting the display data and the generated block data. In the step of generating the long-term storage data, the block generation terminal further generates verification data for confirming the correspondence between the display data and the long-term storage data,
The processing method according to claim 4, wherein in the step of setting the display data to the store data, the block generation terminal further sets the verification data to the store data. When the transaction issuing terminal requests deletion of the display data,
The transaction issuing terminal transmitting delete transaction data for deleting the display data; and
The block generating terminal receiving the delete transaction data;
The block generation terminal deleting the display data from the store data;
The block generation terminal generating block data including the deletion transaction data;
The processing method according to claim 4, further comprising: a step in which the block generation terminal connects the generated block data to block chain data and transmits the generated block data. In the step of generating the long-term storage data, the block generation terminal further generates verification data for confirming the correspondence between the display data and the long-term storage data,
In the step of setting the display data in the store data, the block generation terminal further sets the verification data in the store data,
The processing method according to claim 6, wherein in the step of deleting the display data from the store data, the block generation terminal further deletes the verification data from the store data. When the transaction issuing terminal requests an update of the encryption key of the display data,
The transaction issuing terminal transmitting key update transaction data including an identifier of the display data and a new encryption key;
The block generation terminal receiving the key update transaction data;
The block generation terminal encrypts the display data with a new public key and generates updated display data;
The block generation terminal generating updated long-term storage data corresponding to the updated display data;
The block generation terminal updates the display data of the store data to the updated display data;
The block generation terminal generating block data including the updated long-term storage data;
The processing method according to claim 4, further comprising: a step in which the block generation terminal concatenates the generated block data to the block chain data and transmits the generated block data.

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