CN110034917A - A kind of alliance's chain data processing method and device based on homomorphic encryption algorithm - Google Patents
A kind of alliance's chain data processing method and device based on homomorphic encryption algorithm Download PDFInfo
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- CN110034917A CN110034917A CN201910288486.6A CN201910288486A CN110034917A CN 110034917 A CN110034917 A CN 110034917A CN 201910288486 A CN201910288486 A CN 201910288486A CN 110034917 A CN110034917 A CN 110034917A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
- H04L63/0428—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/08—Network architectures or network communication protocols for network security for authentication of entities
- H04L63/083—Network architectures or network communication protocols for network security for authentication of entities using passwords
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/16—Implementing security features at a particular protocol layer
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- 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
- H04L9/008—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols involving homomorphic encryption
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Abstract
The invention belongs to cryptography and alliance's chain technical fields; in particular a kind of alliance's chain data processing method and device based on homomorphic encryption algorithm; the following steps are included: S1, providing and homomorphic cryptography library and generating homomorphism key; the data provided user are encrypted with its public key; it is all ciphertext operation, the encrypting storing in final account book when data processing；S2, the numerical value that each other nodes generate is encrypted and generates secret value；According to the characteristic of homomorphic cryptography, so that data enhance the safety of data processing, realize whole encryption from the beginning to the end all in encrypted state；It ensure that even if trusting degree in the case where multinode, between allied member and member；Using the full homomorphic encryption algorithm of integer item, it is substantially carried out multinomial operation, does not need to reselect multinomial in ciphering process, continuity is good.
Description
Technical field
The invention belongs to cryptography and alliance's chain technical field, in particular a kind of alliance's chain based on homomorphic encryption algorithm
Data processing method and device.
Background technique
With the development of the times, each field is increasing by data processing, sharing value obtained, so to data
Processing has higher demand, not only to accelerate the transmission speed of data, also to guarantee the secure and trusted of data.How number is guaranteed
According to when opening and shares, and the information that data include during the treatment is not leaked, and can effectively solve the problem that
Trust problem is the theme that we pay close attention to.
The method of data processing at present, the usually data processing scheme of centralization.So being the presence of safety in third party
Hidden danger, once not can guarantee absolute data safety, serious loss will be caused in case of leaking data.
The appearance of block chain makes us no longer need third party, and is therefore widely applied in present and following suffer from.
The decentralization of block chain technology and can not tamper make have a significant development on the framework of processing data, but it is complete
Decentralization consumes a large amount of calculating again, and the efficiency for handling data is not high, therefore alliance's chain technology is also come into being.Its phase
There is higher processing speed than block chain, but it is same, and the allied cheating in those such as allied members has uncooperative user
Data or altered data are stolen by alliance's chain, this all realizes the safe handling of data to us and stablize transmission and causes very greatly
Threat.It is also easy simultaneously by Sybil attack, Sybil attack, i.e., in a peer-to-peer network, each node has multiple identity
Mark, same part data usually require to backup on multiple distributed nodes, and here it is data redundancy mechanism.Malicious node passes through
Most of node of control system weakens the effect of redundancy backup.
However, homomorphic cryptography is a form of encryption.Its significance lies in that really fundamentally solving data and its behaviour
Entrust to privacy problem when third party, especially complete homomorphic cryptography.
In conclusion this patent will provide a kind of data processing system that complete homomorphic cryptography technology is applied to alliance's chain
Method and device to ensure the absolute safety of data be every profession and trade urgent problem to be solved.
Summary of the invention
To solve the problems mentioned above in the background art.The present invention provides a kind of alliances based on homomorphic encryption algorithm
Chain data processing method and device, with high security the characteristics of.
To achieve the above object, the invention provides the following technical scheme: a kind of alliance's chain number based on homomorphic encryption algorithm
According to processing method, comprising the following steps:
S1, homomorphic cryptography library being provided and generates homomorphism key, the data provided user are encrypted with its public key,
It is all ciphertext operation, the encrypting storing in final account book when data processing；
S2, the numerical value that each other nodes generate is encrypted and generates secret value；
S3, the Order node for secret value being transmitted to operation alliance's chain, and child node is controlled, according to the demand of user,
Operation is carried out to each secret value, finally obtains encrypted data；
S4, range proof verification is provided, common recognition node can verify ciphertext；
S5, user are decrypted with its homomorphism private key, are obtained through alliance's chain treated information.
Preferably, the executing subject that logarithm is encrypted in S2 can be each other nodes itself, be also possible to other
Node other than node.
A kind of alliance's chain data processing equipment based on homomorphic encryption algorithm, adds including the homomorphism for generating homomorphism key
The block chain firing floor of Mi Ku, the information encrypting module based on function, function encrypting module and offer operation.
Preferably, the block chain firing floor is divided into 6 layers, is accumulation layer respectively from bottom to up, data Layer, network layer, is total to
Know layer, excitation layer and application layer.
Preferably, the main store transaction log of the accumulation layer and relevant content of trading.
Preferably, the data Layer is made of the chain structure of block and block.
Preferably, the network layer mainly provides common recognition and reaches and the basic-level support of data communication.
Preferably, the common recognition layer is using PBFT common recognition algorithm.
Compared with prior art, the beneficial effects of the present invention are:
1, according to the characteristic of homomorphic cryptography, so that data enhance data processing from the beginning to the end all in encrypted state
Safety realizes whole encryption.
2, it ensure that even if trusting degree in the case where multinode, between allied member and member.
3, using the full homomorphic encryption algorithm of integer item, it is substantially carried out multinomial operation, does not need to select again in ciphering process
Multinomial is selected, continuity is good.
Detailed description of the invention
Attached drawing is used to provide further understanding of the present invention, and constitutes part of specification, with reality of the invention
It applies example to be used to explain the present invention together, not be construed as limiting the invention.In the accompanying drawings:
Fig. 1 is information encryption and decryption schematic diagram of the invention；
Fig. 2 is that the encryption information in the present invention handles figure；
Fig. 3 is that the encryption function in the present invention handles figure；
Fig. 4 is the block chain firing floor architecture diagram in the present invention；
Fig. 5 is the internal data process figure in the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Embodiment 1
Fig. 1-5 is please referred to, the present invention is the following technical schemes are provided: at a kind of alliance's chain data based on homomorphic encryption algorithm
Manage method and device, comprising the following steps:
S1, homomorphic cryptography library being provided and generates homomorphism key, the data provided user are encrypted with its public key,
It is all ciphertext operation, the encrypting storing in final account book when data processing；
S2, the numerical value that each other nodes generate is encrypted and generates secret value；
S3, the Order node for secret value being transmitted to operation alliance's chain, and child node is controlled, according to the demand of user,
Operation is carried out to each secret value, finally obtains encrypted data；
S4, range proof verification is provided, common recognition node can verify ciphertext；
S5, user are decrypted with its homomorphism private key, are obtained through alliance's chain treated information.
In the present embodiment: referring to Fig. 1, homomorphic cryptography has overturned traditional encryption mode, it can realize
Calculating in ciphertext, after generating decryption, seemingly they are in the bright of the matched encrypted result of result of the operation of execution
Text, in other words, this technology make us to upload in cloud private information by encryption, are such as retrieved, are compared
Deng operation, obtain correctly as a result, and cloud can not obtain the information of user in entire treatment process.Therefore full homomorphism adds
The state that encryption is remained during entire data processing may be implemented in close algorithm, so that the demand of user is met,
Encryption information and encryption function are protected.
In the present embodiment: homomorphic cryptography is carried out to the information for needing encrypted transmission to calculate, referring to Fig. 2, wherein receiving
Square A has privately owned function fAWith privately owned information xA, sender is private information yBWith privately owned public key pkBEncryption obtains E (y) hair
A is given, oneself private function f of recipient AAEncrypt private information xAWith E (yB), due to homomorphism property, function fAxBQuilt
It hides, and B obtains E (fA(xA, yB)).Sender passes through privately owned private key encryption D (E (fA(xA, yB)))=fA(xA, yB)。
Function can also be encrypted, the processing of encryption function is as shown in figure 3, mainly to privately owned operation letter
Number is protected.Alice has privately owned function fA, and with privately owned public key pkAEncryption function fAIt is sent to B, B is according to private information
xBCalculate E (fA)(xB), due to homomorphism property, conceal the information x of BB, obtain E (fA(xB)), and it is sent to A, A is private
Key decryption obtains fA(xB)。
Wherein, homomorphic algorithm is specific as follows:
KeyGen: to f (x) ∈ Fp [x], random integer a is selectedi, ri∈ Z, therefore public key pk=<b0, b1..., bn>,
To each bi, meet bi=a*f (x)+ri, b0It is maximum.
Encryption: one integer subset S ∈ { 1,2 ..., n } of random selection, m ∈ { O, 1 }, random selection r ∈ (-
22p, 22p), ciphertext
Decryption:m=[c mod x] mod 2
Isomorphism property:
(1) addition: given public key pk, ciphertext c1、c2, then:
C=[c1+c2]mod b0
(2) multiplication: given public key pk, ciphertext c1、c2, then:
C=[c1*c2]mod b0
Wherein,Indicate that x is rounded downwards；Indicate that x rounds up.
Encryption and decryption correctness proof:
(1) it sets and needs the cleartext information encrypted as m=1 or m=0, the function selected is fi(x), n+1 a and n+1 is selected
A ri, S={ 1,2 ..., n }.
(2) n+1 b is calculatedi, so that b0Number highest.
(3) encrypting plaintext information m, obtains
(4) the preceding k b in i acquirement S set might as well be seti。
(5) ciphertext c can be write as: c=[m+2r+2 (b1+b2+...+bk)]mod b0
(6) c is the data for meeting polynomial form, i.e. c=g (x) x+r '.
(7) when decrypting, c mod x obtains h first, wherein h=r'=m+2 (r+r1+r2+...+rk)。
(8) last h mod 2 obtains ciphertext m.
Homomorphic algorithm correctness proof:
(1) C={ c is set1,c2,...,cn,
(2) H (pk, C)=(c1*c2*...*cn)mod b0, wherein * indicates homomorphism addition or homomorphism multiplication.
(3) D (sk, H (pk, C))=(((c1*c2*...*cn)mod b0)mod x)mod 2。
(4) restore to obtain plaintext m=(m1*m2*…*mn)。
In the present embodiment: homomorphic cryptography is carried out using to the information of calculating, first with the public key pk encrypting plaintext letter generated
M is ceased, is obtainedRestore in plain text passing through private key sk after the processing of alliance's chain, obtaining user needs
The data m ' wanted.Encrypted data can be handled using this kind of encryption method, be simplified process, it can be
Information encryption and the unified combination of data processing, and the safety for being stored in each node can be enhanced well, thus very well
Resist Sybil attack in ground.
In the present embodiment: referring to Fig. 4, the main store transaction log of accumulation layer and relevant content of trading.Wherein, it hands over
Easy log is realized based on LogBack.For the content of transaction by built-in SQLite database purchase, reading and writing SQLite database can be with
It is realized based on JPA；The cochain metadata information of transaction is stored by RocksDB or LevelDB.
Data Layer is made of block and block " chain " (chain structure of block).Wherein, transaction column can be also related in block
The calculating of storage and root node cryptographic Hash of the table in Merkle tree.The content of transaction is also required to encryption.Due in alliance
There are multiple nodes in chain, is effective management node data and guarantee data safety, it is proposed that distribute different public affairs, private for different nodes
Key uses to encrypt.
Network layer mainly provides common recognition and reaches and the basic-level support of data communication.In block chain, each node is both number
According to sender, and be the recipient of data.It may be said that each node is both client and server-side, it is therefore desirable to be based on
Long connection is to realize.We can establish long connection with primary mode based on WebSocket, can also be based on long connection third party
Kit is realized.
Layer know together using PBFT (Practical Byzantine Fault Tolerance) common recognition algorithm.Different from public affairs
The digging mine mechanism of chain more focuses on the unification of each nodal information in alliance's chain, therefore can save digging mine, heads direct for the mesh that common recognition is reached
Mark.
Excitation layer is mainly issuing and circulating for coin (Coin) and Token.In public chain, excitation is the soul of public chain；But
It is not required in alliance's chain.
Application layer is mainly the landing of each product in alliance's chain.The application layer of general alliance chain is all Industry-oriented,
It solves the problems, such as in industry.
In the present embodiment: referring to Fig. 5, alliance's chain framework marks off Order node and non-two class section of Order node
Point, wherein Order node participates in common recognition, and non-Order node provides the service of data operation.Since there are Bucket Principles, that is, it is
The worst Byzantium's node of performance will affect the performance of whole system in system, therefore after using homomorphic cryptography non-Order be saved
The operand of point is balanced, with the stability, high efficiency, availability etc. for guaranteeing whole system.
1, before alliance's chain node obtains data, homomorphic cryptography library is provided and generates homomorphism key (including public key and private
Key), the data provided user are encrypted with its public key, and data processing when is all ciphertext operation, in final account
Encrypting storing in this, even if node is broken, getting data record can not also be decrypted；
2, the numerical value then generated to each other nodes is encrypted and generates secret value, the execution that logarithm is encrypted
Main body can be each other nodes itself, the node being also possible to other than other nodes, and node of such as knowing together does not do specific limit herein
It is fixed.
3, then secret value is transmitted to the Order node of operation alliance's chain, and controls child node, according to the need of user
It asks, operation is carried out to each secret value, finally obtains encrypted data.
4, offer range proves verification, and common recognition node can verify ciphertext, without decrypting energy checkout transaction
Correctness, thus identify malice transaction risk,
5, it ensure that the correct execution of intelligent contract.Final output treated data, finally by user's its homomorphism private
Key is decrypted, and obtains through alliance's chain treated information.
The working principle of the invention and process for using: for example national health department can generate according to homomorphic encryption algorithm
Public key and private key first use public key encryption account book, are then passed in alliance's chain, to the various big hospital in alliance as federation node,
Processed data are finally returned to hygiene department, then use private key by the acquisition and processing that medical data is carried out in alliance's chain
Decryption obtains the data finally counted, and steps are as follows:
Step 1. homomorphic cryptography first is the cryptological technique of the computational complexity theory based on difficult math question, can be to warp
The data for crossing homomorphic cryptography carry out data processing and obtain an output, this output is decrypted, can also be to processing data
Function encrypted,
Its result is consistent with the output result obtained with the initial data of Same Way processing unencryption, and this example uses
Initial data is encrypted:
Wherein, M indicates the set of plaintext, and C indicates the set of ciphertext, ← indicate levoform can be calculated from right formula.
Particularly, have:
,E(m1×m2)←E(m1)×E(m2)
Respectively additive homomorphism, multiplicative homomorphic.
Code demo is as follows:
In addition, the premise for executing this step is to be generated together before Order node obtains data according to homomorphic encryption algorithm
State key (including public key and private key), and then Order node needs open homomorphism public key so that the node other than other nodes makes
With, and user itself retains homomorphism private key.
This step of step 2. is added by the numerical value that homomorphism public key disclosed in Order node generates each other nodes
It is close and generate secret value, and then subsequent execution step is participated in by using secret value can guarantee the specific data of other nodes
Content is not leaked, and improves the crypticity of data processing.In addition, the executing subject that logarithm is encrypted can be it is each other
Node itself, the node being also possible to other than other nodes, node of such as knowing together are not specifically limited herein.Alliance's chain is to use
PBFT is exactly to solve to know together with algorithm model, and token distribution mechanisms are not present in it, and energy consumption is lower.It is big that process, which can be sketched,
Family first votes in leader, other people vote through after leader's book keeping operation.In PBFT algorithm, as long as can prove malfunction
Byzantium's node be less than system total amount of 1/3, then whole system can work normally.Alliance's chain is by being based on
The member identities of PKI manage, and alliance's chain network can limit the node of access and the various abilities of user.For example,
The certificate of three types: the certificate of registration (Enrollment Certificate), certificate of fair is considered in Fabric design
(Transaction Certificate), and ensure the TLS certificate of communication link safety.The node for only allowing to authorize is added
Network, and information can be checked according to permission, its maintenance is generally carried out by allied member, is easy to carry out the control of permission, be administered
There are rule that can follow.Maintenance is simple, and transaction cost is also lower.
In addition, homomorphic encryption algorithm signified in this step, is that additive homomorphism Encryption Algorithm and multiplicative homomorphic are added
The general designation of close algorithm, and it is above-mentioned since there are transformational relations between multiplication and addition, it is above two to calculate the same of type
State Encryption Algorithm can be realized in this step in the encryption of data and subsequent step to the summation quadrature operation of secret value.
Then step 3. is transmitted to secret value the Order node of operation alliance's chain, and control child node, according to user
Demand, to each secret value carry out operation, finally obtain encrypted data.
The each node of step 4. all following the intelligent contract below alliance's chain between each other, then by each node
Block is connected, and transmits and handles data in each node.It should be pointed out that node vacation is set with n, Ge Gejie
Point is all the federation node in alliance's chain, and the permission possessed is higher, the relevant operation being able to carry out under alliance's chain mechanism.
Step 5. final output treated data, are finally decrypted with its homomorphism private key by user, are obtained through alliance
Chain treated information.
It can be concluded that be either Order node or following node, be all unknowable to information, because carrying out
Homomorphic cryptography even the Order node in alliance, can obtain data can not also restore specific information, because,
Data are having already passed through encryption before.And it is based on homomorphic encryption algorithm, can be added and obscure in real information
Information, even even if can dramatically ensure that alliance's chain of weak center in this way it can be seen that data, also do not do
Method is stolen its information or is distorted.
Finally, it should be noted that the foregoing is only a preferred embodiment of the present invention, it is not intended to restrict the invention,
Although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art, still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features.
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (8)
1. a kind of alliance's chain data processing method based on homomorphic encryption algorithm, it is characterised in that: the following steps are included:
S1, homomorphic cryptography library is provided and generates homomorphism key, the data provided user are encrypted with its public key, data
It is all ciphertext operation, the encrypting storing in final account book when processing；
S2, the numerical value that each other nodes generate is encrypted and generates secret value；
S3, the Order node for secret value being transmitted to operation alliance's chain, and child node is controlled, according to the demand of user, to each
A secret value carries out operation, finally obtains encrypted data；
S4, range proof verification is provided, common recognition node can verify ciphertext；
S5, user are decrypted with its homomorphism private key, are obtained through alliance's chain treated information.
2. a kind of alliance's chain data processing method based on homomorphic encryption algorithm according to claim 1, it is characterised in that:
The executing subject that logarithm is encrypted in S2 can be each other nodes itself, the node being also possible to other than other nodes.
3. a kind of alliance's chain data processing equipment based on homomorphic encryption algorithm, it is characterised in that: including close for generating homomorphism
The homomorphic cryptography library of key, the information encrypting module based on function, function encrypting module and provide the block chain firing floor of operation.
4. a kind of alliance's chain data processing equipment based on homomorphic encryption algorithm according to claim 3, it is characterised in that:
The block chain firing floor is divided into 6 layers, is that accumulation layer, data Layer, network layer, common recognition and are answered at layer, excitation layer respectively from bottom to up
With layer.
5. a kind of alliance's chain data processing equipment based on homomorphic encryption algorithm according to claim 4, it is characterised in that:
The main store transaction log of accumulation layer and relevant content of trading.
6. a kind of alliance's chain data processing equipment based on homomorphic encryption algorithm according to claim 4, it is characterised in that:
The data Layer is made of the chain structure of block and block.
7. a kind of alliance's chain data processing equipment based on homomorphic encryption algorithm according to claim 4, it is characterised in that:
The network layer mainly provides common recognition and reaches and the basic-level support of data communication.
8. a kind of alliance's chain data processing equipment based on homomorphic encryption algorithm according to claim 4, it is characterised in that:
The common recognition layer is using PBFT common recognition algorithm.
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| CN110505062A (en) * | 2019-08-27 | 2019-11-26 | 杭州云象网络技术有限公司 | A kind of Dynamic Oval curve cryptographic methods applied to alliance's chain |
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| CN110784300A (en) * | 2019-11-08 | 2020-02-11 | 中国电子科技网络信息安全有限公司 | Secret key synthesis method based on multiplication homomorphic encryption |
| CN110968884A (en) * | 2019-12-06 | 2020-04-07 | 上海中信信息发展股份有限公司 | Block chain and homomorphic encryption-based price statistical method |
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