CN107911216A - A kind of block chain transaction method for secret protection and system - Google Patents

A kind of block chain transaction method for secret protection and system Download PDF

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Publication number
CN107911216A
CN107911216A CN201711029282.8A CN201711029282A CN107911216A CN 107911216 A CN107911216 A CN 107911216A CN 201711029282 A CN201711029282 A CN 201711029282A CN 107911216 A CN107911216 A CN 107911216A
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China
Prior art keywords
node
transaction
group
account
accounting nodes
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CN201711029282.8A
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Chinese (zh)
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CN107911216B (en
Inventor
李升林
何德彪
谢翔
孙立林
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Juzix Technology Shenzhen Co ltd
Wuhan University WHU
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Matrix Technology (shenzhen) Co Ltd
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Priority to CN201711029282.8A priority Critical patent/CN107911216B/en
Publication of CN107911216A publication Critical patent/CN107911216A/en
Priority to PCT/CN2018/112154 priority patent/WO2019080933A1/en
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/32—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
    • H04L9/3247—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials involving digital signatures
    • H04L9/3255—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials involving digital signatures using group based signatures, e.g. ring or threshold signatures
    • 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
    • G06F21/602—Providing cryptographic facilities or services
    • 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
    • G06F21/62—Protecting access to data via a platform, e.g. using keys or access control rules
    • G06F21/6218—Protecting access to data via a platform, e.g. using keys or access control rules to a system of files or objects, e.g. local or distributed file system or database
    • G06F21/6245—Protecting personal data, e.g. for financial or medical purposes
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q40/00—Finance; Insurance; Tax strategies; Processing of corporate or income taxes
    • G06Q40/04—Trading; Exchange, e.g. stocks, commodities, derivatives or currency exchange
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
    • H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
    • H04L9/085—Secret sharing or secret splitting, e.g. threshold schemes

Abstract

The present invention, which provides a kind of block chain transaction method for secret protection and system, this method, to be included：Transaction group is created between the node of block catenary system, user creates an account on node, and group is added after node generation account public affairs private key information；Transaction request node uses broadcast enciphering algorithm for encryption Transaction Information, and carries out group ranking to encrypted Transaction Information, afterwards the Transaction Information after broadcast enciphering and group ranking；Common non-accounting nodes are verified and broadcast Transaction Information, accounting nodes decrypted transaction information simultaneously performs intelligent contract and carries out book keeping operation processing, public account book is charged to after carrying out broadcast enciphering, the data of preservation only allow accounting nodes, transaction request node and management node to open.Present invention uses broadcast enciphering algorithm and the method for group ranking technology, to solve the Privacy Protection in block catenary system, while ensures the trackability of transaction.

Description

A kind of block chain transaction method for secret protection and system
Technical field
The present invention relates to block chain field, more particularly to the security of block chain transaction privacy and the technology are in block chain The application in the fields such as finance.
Background technology
Block chain technology is initiated by the decentralization distribution account book technology of bit coin, its by technology endorse rather than in Xin Hua credit institutions facilitate transaction, have the characteristics that decentralization, without center trust, can not distort and encryption safe.Section Participant of the point as block catenary system, safeguards a data copy respectively.Node keeps backup database by algorithm of knowing together The uniformity of data.Confidence of the participant to data reliability is improved on the premise of trusting among the participants without foundation.Pass In the block chain or bit coin technology of system, all data be all it is transparent, include the content of transaction, sender, recipient Address (sender in bit coin, recipient address provide certain secret protection, but can still reveal some privacy informations).
In financial industry, because data, sender and recipient's information are related to substantial amounts of trade secret and interests, Data full disclosure is infeasible, and the protection of privacy information is even more important.On the one hand, authoritative institution wish to block chain into Row supervision, investigates illegal transaction activity, and on the other hand, user worries that the details of its transaction is exposed so as to cause a number Unauthorized party may be exposed to according to the details with life style.User protects the demand of privacy and right to know and the supervision of authorities Challenge can't neglect caused by conflict between power.Therefore, the key problem that block chain needs to solve is：How to provide On the premise of privacy, data protection, data are carried out with distributed power really and is stored, while to have management node intervention, to handing over Easily supervised, make transaction traceable, can be audited.
In block catenary system, what is maintained between each node is consistent public account book, this account book have recorded each in system The relevant information of node, operates public account book by certain common recognition mechanism between node.In this case institute in account book There is the other information recorded on the Transaction Information of user, including block chain to be all exposed, the Privacy Protection of user produces therewith It is raw.System is needed in the case where ensureing privacy of user, realizes that the transaction of block chain can verify that, the characteristics such as history can be looked into, ensure to hand over Easy validity and can be supervisory.The method for secret protection of block chain is mainly the following at present：
The first：The secret protection technology used in existing block catenary system such as bit coin and ether mill, it is only to handing over Easy node has used " pseudo- anonymous " technology, and counterparty can create multiple addresses and be traded, and each address correspond to non-right Claim a public key in encryption, and there is no binding relationship with the true identity of counterparty, i.e., it is address of node is anonymous, and merchandise Detail is open and clear, directly the remaining sum of two transaction nodes is operated during transaction.But the method can not really ensure node It is " anonymity ", such as in the transaction of bit coin system, user uses public key cryptographic Hash conduct without using true name Transaction ID.But by the way that Transaction Information is associated with personal information in actual life, believe in conjunction with the address of service provider etc. Breath and open account book, address, which just can correspond to personal user, its all consumer record etc. and will leak, to be stayed, this will bring serious Privacy of user problem.
Second：Remaining sum on public account book is directly encrypted, only node in itself or entitle correlation Can to Transaction Information as it can be seen that remaining node can not operation data, account book information is difficult to being consistent property.Such as Chinaledger proposes the scheme based on central analogue (CCP), and transaction initiator is merchandised using the public key encryption of CCP, label CCP is submitted to after name, decryption, inspection signature are realized by CCP, examine remaining sum, if effectively realizing that transfer amounts transfer ownership again.This In method, remaining node can only endorse transaction, and although the remaining sum that cannot endorse, this scheme protect node users privacy, but mistake In centralization, whole system is merchandised dependent on the prestige of CCP.What also ether mill community proposed bypasses (State based on state Channel secret protection scheme), in this scheme process of exchange, transaction is submitted in intelligent contract by block chain interior joint, intelligence Energy contract realizes the encryption of middle flow detail, remaining node is invisible；When being completed to transaction, then final value allocative decision Decryption, back to block chain remaining node on.But the method only protects the privacy of pilot process part, the total value of transaction changes It is and transparent to all nodes.
3rd：Ensure privacy using encryption methods such as additive homomorphism encryption technology or zero-knowledge proofs.Additive homomorphism Encryption is a kind of asymmetric encryption for numerical value, and ciphertext is respectively Enc (A), Enc (B), Enc after being encrypted for numerical value A, B, C (C), there is characteristic：A+B=C, Enc if (A)+Enc (B)=Enc (C).Such as the hair in Patent No. " CN106549749A " In bright patent " one kind is based on the encrypted block chain method for secret protection of additive homomorphism ", following scheme is disclosed：In a block In chain network, transaction request node initiates transaction, and through the whole network node verification, last trade recipient receives transaction amount and completes Transaction, the step of transaction encryption method be specially：Homomorphism key generates；The visible remaining sum of the account of sender is split as trade gold Volume and remaining remaining sum；With the whole network homomorphism public key encryption transaction amount and remaining remaining sum, ciphertext X1 and X2 are denoted as；With the public affairs of recipient Key encrypts transaction amount, obtains ciphertext Y1；Sender initiates transaction, and transaction content includes tri- fields of X1, X2 and Y1；The whole network section Point verification Transaction Information, safeguards public account book；Update the visible remaining sum of recipient.Such scheme is realized to be added using additive homomorphism The function of transaction amount and user balance on secret skill art hidden blocks chain, it is desirable to solve exposure in traditional block chain transaction The problem of real transfer amounts, realizes the privacy protection function on block chain.But this scheme can not confirm the one of transaction Cause property, lacks the verification link to validity of merchandising.In addition, ZCash on the basis of bit coin, utilizes the skill of zero-knowledge proof Art provides complete privacy of identities protection and transaction content secret protection.In ZCash systems, transaction has " Zero Knowledge " property, Both both parties address will not be exposed, transaction amount will not be exposed.Since zero-knowledge proof belongs to complicated cryptography agreement, Its introducing can significantly influence performance, and lack the supervision of relevant authority.
In conclusion in existing block chain secret protection scheme, private data guard is being provided without a kind of scheme Meanwhile and data can be carried out with distributed really power and managed, moreover it is possible to the effect of meeting to supervise transaction.
The content of the invention
It is an object of the invention to provide a kind of block chain transaction method for secret protection, to solve in the prior art without one Kind scheme can carry out data distributed really power and manage while private data guard is provided, moreover it is possible to meet to handing over The technical problem easily supervised.
That is, in existing block catenary system, the identical public account book of all node maintenances one.If account book information There is variation, then its consistency is kept by certain common recognition mechanism.During this, if the privacy information recorded in account book is public Open transparent, then can cause serious harm to the privacy of node users.In some scenes, particularly in financial industry, Because it is related to substantial amounts of trade secret and interests, it is necessary to carry out stringent privacy to the privacy information between block catenary system node Protection.While secret protection, also to ensure third-party monitoring and audit, to prevent the generation of illegal activities.
The present invention provides a kind of block chain transaction method for secret protection, it is characterised in that comprises the following steps：
Transaction group is created between the node of block catenary system, user can create an account on block chain node, node generation The transaction group is added after account public affairs private key information；Management node issues group public key and group's certificate for each node, and manages section Point holds group private key；
Transaction request node uses broadcast enciphering algorithm for encryption Transaction Information, and the broadcast enciphering algorithm specifies book keeping operation to save Point, management node allow to check encrypted content；And group ranking is carried out to encrypted Transaction Information using group ranking algorithm, make Transaction Information is obtained anonymous to propagate；The Transaction Information after the broadcast enciphering and group ranking is broadcasted afterwards；
Common non-accounting nodes after group's public key verifications using broadcasting Transaction Information；Accounting nodes decrypt the Transaction Information simultaneously Perform intelligent contract and carry out book keeping operation processing, while intelligent contract preserves handling result, with transaction request node, accounting nodes and The account public key of management node charges to public account book after carrying out broadcast enciphering, and the data of preservation only allow accounting nodes, transaction please Node and management node is asked to open.
Management node solves real account address using group's private key, and the group ranking of group user is tracked, and exposure Signatory's identity, to realize supervision.
In brief, it is hidden in block catenary system to solve present invention uses broadcast enciphering algorithm and group ranking algorithm Private protection problem.Transaction request node will merchandise after packing, using broadcast enciphering algorithm multiple recipients can be specified to check and be added Close content, and group ranking allows node member to send transaction request in a manner of anonymous, while support third-party supervision and examine Meter.
First, the present invention uses broadcast enciphering algorithm, and transaction Global Information chooses transaction initiator, accounting nodes, management Node public key carries out broadcast enciphering, and accounting nodes are performed intelligent contract and carry out book keeping operation processing after being decrypted using own private key, intelligence When contract preserves handling result, broadcast enciphering is carried out with the account public key of transaction initiator, accounting nodes and management node After charge to public account book.The data of preservation only have accounting nodes, transaction initiator and management node to untie and check.
Secondly, the present invention uses group ranking algorithm, and initiator substitutes its digital signature using group ranking in transaction, common non- Accounting nodes can be signed using group's public key verifications, and management node can solve real account address using group's private key, to group The group ranking of user is tracked, and exposure signatory's identity, so as to fulfill supervision.
Brief description of the drawings
Fig. 1 is a kind of principle flow chart of block chain transaction method for secret protection of the present invention；
Fig. 2 is a kind of example flow chart of block chain transaction of the present invention.
Embodiment
Below in conjunction with attached drawing, the present invention is illustrated.Technical scheme has used broadcast enciphering and group ranking to calculate The private data in block chain is encrypted in method, four class nodes involved in block catenary system, be respectively transaction request node, Non- accounting nodes (also referred to as common non-accounting nodes), accounting nodes and management node, wherein being acted in systems per class node It is as follows respectively：
First, transaction request node definition is：The node that transaction is initiated
In systems, a transaction includes transaction request node and the account address of recipient and transaction content, wherein, The account address of transaction acceptance side is intelligent contract address, and transaction content is including transaction amount etc..
Transaction request node needs that Transaction Information is encrypted, and encrypted structure is as shown in table 1：
Table 1
Transaction Information carries out broadcast enciphering first, and along with group ranking, specific processing is as follows：
● the private key that accesses to your account signs whole Transaction Information
● Transaction Information carries out broadcast enciphering (using transaction initiator, all accounting nodes, management node public key)
● group ranking is carried out to the Transaction Information ciphertext after broadcast enciphering.
2nd, common non-accounting nodes：Or non-accounting nodes, its complete major function be transaction verification after again Broadcast.
Common non-accounting nodes need to import group's public key, after common non-accounting nodes receive transaction, need to use group's public key The group ranking of transaction is verified, if being proved to be successful, is broadcasted, otherwise its data is no longer propagated.
3rd, accounting nodes：Book keeping operation processing is carried out to transaction
Accounting nodes need to import group's public key, and accounting nodes processing is as follows：
● using group's public key verifications group ranking, it is further processed if being proved to be successful, otherwise abandons the transaction
● the transaction ciphertext of broadcast enciphering is untied using accounting nodes private key, it was demonstrated that insider transaction is signed
● transaction request node account status is checked from built-in intelligence contract, if account is not present or abnormal state, Directly lose transaction；Check intelligent contract state, if contract is deleted, directly lose transaction, return abnormal
● intelligent contract is performed, and is modified according to transaction data, reuses account public key and accounting nodes, management section Renewal is into public account book after point public key encryption.
4th, management node：Transaction supervision
Management node possesses group private key, can from group ranking commutant member node account public key, so as to be traded Retrospect and audit.
In summary, a kind of block chain transaction intimacy protection system, including multiple block chain nodes, have in block catenary system There are one or more transaction groups, user can create an account on block chain node, add after its node generation account public affairs private key information Enter group allows node as group ranking, and the group ranking allows node to further comprise：Transaction request node, common non-book keeping operation section Point, accounting nodes and management node, wherein：
Transaction request node：For using broadcast enciphering algorithm for encryption Transaction Information, and using group ranking algorithm to encryption Transaction Information afterwards is signed, and broadcasts the Transaction Information after the encryption and group ranking afterwards；The broadcast enciphering algorithm refers to Determine accounting nodes, management node allows to check encrypted content；
Accounting nodes：Book keeping operation processing is carried out for decrypting the Transaction Information and performing intelligent contract, intelligent contract preserves While handling result, charged to after carrying out broadcast enciphering with the account public key of transaction request node, accounting nodes and management node Public account book；
Common non-accounting nodes：For using group's public key verifications and broadcast Transaction Information；
Management node：For solving real account address using group's private key, the group ranking of group user is tracked, and Exposure signatory's identity, to realize supervision.
A kind of referring to Fig. 1, flow chart of block chain transaction method for secret protection.It comprises the following steps：
S110：The transaction group that group ranking can be achieved is created between the node of block catenary system；
Group ranking (group signature) is a prior art, but group ranking technology is applied to by the applicant Block chain transaction field can solve the problems, such as secret protection.The implementation of group signature scheme is jointly complete by group members and group manager Into group's management is made of group members qualification authentication person and group members qualification revocation manager.Group members qualification authentication person, which is responsible for, is The foundation of system and the addition of group members.In a group signature scheme, any one member in a colony can be with anonymity Mode represent whole colony and sign to message, anyone can verify signature, and signature will not reveal the body of signer Part, and administrator has the ability to trace the identity of signer.As other digital signature, group ranking is can to disclose to verify , and can only be verified with single group's public key.
Also, the present invention is also added into broadcast enciphering to realize the security merchandised during transaction data communications, broadcast Encryption is a kind of cipher system on insecure channels to one group of user's transmission encrypting information, and it is any that it can choose sender User, which gathers, carries out broadcast enciphering, and only authorized user can decrypt ciphertext.Broadcast enciphering is added using the public key of one group of user Close, user can be decrypted with using the private key of oneself in group.
In the present invention, transaction group is created between the node of block catenary system：User can create an account on block chain node, Group is added after its node generation account public affairs private key information, examination ＆ verification can import group public key and group's certificate after passing through, become group ranking and permit Perhaps node, group ranking allow node to be respectively divided into common non-accounting nodes, transaction request node, accounting nodes and pipe in group Node is managed, equally, all group rankings in same group allow node to have identical group's certificate, can use group's public key pair The group ranking of transaction is verified, can be proved to be successful, then is the transaction data broadcasted of this group.Accounting nodes import group Public key and group's certificate, group's private key are only managed node preservation.
S120：Transaction request node uses broadcast enciphering algorithm for encryption Transaction Information, and using group ranking algorithm to encryption Transaction Information afterwards carries out group ranking, broadcasts the Transaction Information after the broadcast enciphering and group ranking afterwards.
Broadcast enciphering algorithm is specified to be allowed to check encrypted content including accounting nodes, management node.
S130：Group ranking allows the common non-accounting nodes in node using group's public key verifications and to broadcast Transaction Information.
S140：Accounting nodes, which decrypt the Transaction Information and perform intelligent contract, carries out book keeping operation processing, and intelligent contract preserves While handling result, charged to after carrying out broadcast enciphering with the account public key of transaction request node, accounting nodes and management node Public account book, the data of preservation only allow accounting nodes, transaction request node and management node to open.
S150：When necessary, management node solves real account address using group's private key, to the group ranking of group user into Row tracking, and exposure signatory's identity, to realize supervision.
Compared with the present method for secret protection of industry, the present invention has following advantage：
1) transaction request node can support the examination of management node while privacy of identities is protected in a manner of anonymous, Lifting transaction privacy and trackability.
2) transaction request node may specify that multiple recipients check encrypted content, lift flexibility.
3) combination of two kinds of technologies of broadcast enciphering and group ranking, can be protected on the premise of block catenary system privacy is protected Demonstrate,prove third-party supervision and audit.
Embodiment
In group ranking, each user in same a group needs public key, private key and group's certificate, and group administrator also possesses Group's private key, all related accounts are managed collectively in same group, and by group administrator.
(1) account is established：User can create an account on block chain node, and node automatically generates public and private key pair, and adds Enter group.A kind of specific example procedure is as follows：
A1：User creates an account on agency node；
A2：Node generates account public private key pair, and prompts user to input password；
A3：The public private key file of node generation is simultaneously saved in local, and with password encryption, (password encryption is only wherein to private key file A kind of Encryption Algorithm)；
A4：Node initiates account creation application transaction, and recipient is built-in intelligence contract, carries mechanism ID and account is public Key, intelligent contract preserve account status to be pending, and key values are account address, are account public key；
A5：For exempting to audit mechanism, directly arrive in next step, otherwise need to call intelligent contract examination ＆ verification account by group's management node Family adds the application of this group；
A6：Group certificate is signed and issued to account according to group's private key, intelligent contract preserves account status and passes through for examination ＆ verification, and preserve into Group's certificate after member's public key encryption.
(2) Account Closure
B1：Group administrator initiates Account Closure transaction, and recipient is built-in intelligence contract；
B2：Interdependent node performs intelligent contract, and modification account status is cancellation；
B3：Account status is reset, while asset account relevant information is cleared up；
(3) transaction flow management
In process of exchange, it is mainly concerned with three classes and participates in main body：Transaction node, common non-accounting nodes and book keeping operation save Point.The particular transactions flow of the present invention is illustrated in fig. 2 shown below：
S210：Transaction request node is locally generated transaction, and after carrying out broadcast enciphering and group ranking, transaction is sent to net In network, node can select the transaction (may also directly arrive accounting nodes) of adjacent common non-accounting nodes transmission route；
S220：After common non-accounting nodes receive transaction, transaction is verified first with group's public key.Verification Content may include the form of data, the authenticity in source etc..If verification is not by abandoning the data and no longer being passed Broadcast.
S230：Then continue to be transmitted to the node closed on if the verification passes and be traded synchronization.The node of forwarding can be Common non-accounting nodes can also be accounting nodes, if the action of common non-accounting nodes, repeatedly S220；If book keeping operation Node then triggers S240.
S240：Accounting nodes first verify that transaction, if verification is not by abandoning the transaction.If being proved to be successful Carry out S250.
S250：Accounting nodes untie transaction ciphertext using node account private key, read transaction content and are calculated, and according to As a result modification is read out to the data of database.
S260：Accounting nodes are packaged into state after renewal and transaction block, and a block includes one or more hand over Easy information；
S270：Block is synchronized to adjacent node by accounting nodes.
S280：Common non-accounting nodes verification block, by rear, local is saved in by block.
S290：When transaction request node needs to inquire about data, do information to adjacent (non-book keeping operation or book keeping operation) node and look into Ask.
S300：It is queried node and corresponding data is returned into transaction request node.
The present invention be with reference to according to the method for the embodiment of the present invention, the flow chart of equipment and computer program product and/or Block diagram describes.It should be understood that each flow in flow chart and/or square bearer figure can be realized by computer program instructions And/or square frame and the flow in string routine figure and/or block diagram and/or the combination of square frame.These computer programs can be provided Instruct the processor of general-purpose calculator, special purpose computer, Embedded Processor or other programmable data processing equipments with Produce a machine so that the instruction performed by computer or the processor of other programmable data processing equipments produces use In the function of realizing above-mentioned one flow of flow chart or the instruction of multiple string routines.
Although the present invention is disclosed as above with preferred embodiment, it is not for limiting claim, any this area Technical staff without departing from the spirit and scope of the present invention, can make possible variation and modification, therefore the present invention Protection domain should be subject to the scope that the claims in the present invention are defined.

Claims (9)

  1. The method for secret protection 1. a kind of block chain is merchandised, it is characterised in that comprise the following steps：
    Transaction group is created between the node of block catenary system, user can create an account on block chain node, node generation account The transaction group is added after public private key information；Management node issues group public key and group's certificate for each node, and management node is held There is group private key；
    Transaction request node uses broadcast enciphering algorithm for encryption Transaction Information, and the broadcast enciphering algorithm specifies accounting nodes, pipe Reason node allows to check encrypted content；And group ranking is carried out to encrypted Transaction Information using group ranking algorithm so that hand over Easy information anonymous can be propagated；The Transaction Information after the broadcast enciphering and group ranking is broadcasted afterwards；
    Common non-accounting nodes after group's public key verifications using broadcasting Transaction Information；Accounting nodes are decrypted the Transaction Information and are performed Intelligent contract carries out book keeping operation processing, while intelligent contract preserves handling result, with transaction request node, accounting nodes and management The account public key of node charges to public account book after carrying out broadcast enciphering, and the data of preservation only allow accounting nodes, transaction request section Point and management node are opened.
  2. 2. the method as described in claim 1, it is characterised in that further include：
    Management node solves real account address using group's private key, and the group ranking of group user is tracked, and exposure signature Person's identity, to realize supervision.
  3. 3. method as claimed in claim 1 or 2, it is characterised in that transaction request node is signed using broadcast enciphering algorithm and group Name algorithm is traded information encryption and group ranking, processing further comprise：
    The transaction request node private key that accesses to your account signs whole Transaction Information；
    Transaction request node carries out broadcast enciphering using the account public key of transaction request node, all accounting nodes, management node；
    Group ranking is carried out to the Transaction Information ciphertext after broadcast enciphering.
  4. 4. method as claimed in claim 1 or 2, it is characterised in that common non-accounting nodes after group's public key verifications using broadcasting Transaction Information, further comprises：
    Common non-accounting nodes receive the Transaction Information, and the group ranking of the Transaction Information is tested using group's public key Card, if being proved to be successful, further broadcast, otherwise does discard processing.
  5. 5. method as claimed in claim 1 or 2, it is characterised in that accounting nodes decrypt the Transaction Information and perform intelligence Contract, which carries out book keeping operation processing, includes following operation：
    Use group's public key verifications group ranking；
    The Transaction Information ciphertext of broadcast enciphering, verification insider transaction signature are untied using the account private key of accounting nodes；
    Transaction request node account status is checked from built-in intelligence contract, if account is not present or abnormal state, is directly lost Fall transaction；Check intelligent contract state, if contract is deleted, directly lose transaction, return abnormal；
    Intelligent contract is performed, is modified according to transaction data, reuses transaction request node, accounting nodes and management node Renewal is into public account book after the encryption of account public key broadcasts.
  6. 6. method as claimed in claim 1 or 2, it is characterised in that further include：
    Accounting nodes are packaged into state after renewal and transaction block, and a block includes one or more Transaction Informations；
    Block is synchronized to adjacent node by accounting nodes；
    Common non-accounting nodes verify the block, preserve the block to local after being verified.
  7. 7. method as claimed in claim 6, it is characterised in that further include：
    Transaction request node carries out information inquiry by adjacent node；
    It is queried node and corresponding data is back to the transaction request node.
  8. 8. method as claimed in claim 1 or 2, user can create an account on block chain node, its node generation account is public Transaction group is added after private key information to further comprise：
    User creates an account on node；
    Node generates account public private key pair；
    The public private key file of node generation is simultaneously saved in local, and private key file is encrypted；
    Node initiates account creation application transaction, and recipient is built-in intelligence contract, carries mechanism ID and account public key, and intelligence is closed Account status is about preserved to be pending, key values are account public key；Intelligent contract examination ＆ verification account is called by the management node for the group that merchandises The application of this group is added, or is directly carried out in next step；
    Group certificate is signed and issued to account according to group's private key, intelligent contract preserves account status and passes through for examination ＆ verification, and preserves account public key Encrypted group's certificate.
  9. The intimacy protection system 9. a kind of block chain is merchandised, including multiple block chain nodes, it is characterised in that：Have in block catenary system There are one or more transaction groups, user can create an account on block chain node, add after node generation account public affairs private key information The group that enters to merchandise, which becomes group ranking, allows node, and the group ranking allows node to include：Transaction request node, common non-book keeping operation section Point, accounting nodes and management node, wherein：
    Transaction request node：For using broadcast enciphering algorithm for encryption Transaction Information, and using group ranking algorithm to encrypted Transaction Information is signed, and broadcasts the Transaction Information after the broadcast enciphering and group ranking afterwards；The broadcast enciphering algorithm is specified Accounting nodes, management node allow to check encrypted content；
    Accounting nodes：Book keeping operation processing, intelligent contract preservation processing are carried out for decrypting the Transaction Information and performing intelligent contract As a result while, charged to after carrying out broadcast enciphering with the account public key of transaction request node, accounting nodes and management node public Account book；
    Common non-accounting nodes：For using group's public key verifications and broadcasting Transaction Information；
    Management node：For solving real account address using group's private key, the group ranking of group user is tracked, and exposure Signatory's identity, to realize supervision.
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