CN109189727A - A kind of block chain ciphertext cloud storage sharing method based on property broker re-encryption - Google Patents
A kind of block chain ciphertext cloud storage sharing method based on property broker re-encryption Download PDFInfo
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Abstract
A kind of block chain ciphertext cloud storage sharing method based on property broker re-encryption, the present invention is on the basis of proxy re-encryption and attribute base encryption technology, propose a kind of block chain ciphertext storage sharing concept of property broker re-encryption for supporting keyword retrieval, metadata ciphertext is separated into storage with prime information ciphertext by property broker re-encryption algorithm, the book keeping operation power of node is determined using the Pool verifying pond mechanism in block chain technology, it introduces information exchange contract to audit user identity, and tranaction costs is cleared automatically.Safety and experimental analysis show: present invention reduces encryptions, decryption duration, alleviate cloud storage high frequency access pressure.When attribute number is 100, consumption is 1.69s when the decryption again of system, and the execution efficiency of system improves 19.04%~49.68%.The present invention has stronger resistance against colluders, has a good application prospect in current internet of things field.
Description
Technical field
The invention belongs to the cryptological techniques and intelligence contract technology in block chain technical field, are related to solving cloud system
The method of middle information security storage sharing problem.
Background technique
With cloud computing, the rapid development of Internet of Things (Internet Of Things, IOT) technology, cloud storage becomes
A kind of most common network storage service.Currently, cloud storage shared system is centralization mostly, provided in third party cloud service
Managing personal information with the help of quotient (Cloud Service Provider, CSP), but this method not only needs largely to lead to
Believe expense, the calculating cost of great number, and open and clearization of Internet of Things faces the integrality, accuracy, confidentiality of information
Seriously threaten.
In order to better ensure that information security and integrality, Hong et al. is from the angle for reducing information owner management complexity
Degree sets out, and devises a kind of privacy sharing model of mixed cloud re-encryption based on encryption attribute, realizes highly efficient move
State ciphertext access control.Seo et al. devises a kind of proxy re-encryption method based on attribute, by traditional proxy re-encryption with
The encryption of attribute base combines, and so that information owner is authorized specified user and decrypts the close of re-encrypted according to the attribute of user
Text.All of above research realizes that the secure interactive of information plays positive effect, but do not support to the confidentiality for guaranteeing information
Keyword retrieval function causes certain obstruction for efficient information sharing.Shi et al. is proposed one kind and can be examined based on public key
The property broker re-encryption model of rope keyword does not support the decryption of original cipher text and re-encryption ciphertext.Liang et al. with
The property broker re-encryption model of the support keyword retrieval based on key strategy of its design is demonstrated under machine oracle model,
But the calculating cost of the invention is larger.All researchs set forth above are to use centralized management mode, all users'
Information concentrates in resource pool, is managed collectively using specific software to information pressure by third party CSP, CSP's is soft or hard
Once part is likely to result in information loss, leakage or even service disruption failure or under attack.
The appearance of block chain (Blockchain, BC) technology for people provide a kind of decentralization, can not distort, can not
It forges, the distribution management method of collective's maintenance.This acute hearing has been put forward for the first time one and can be used as in American foreign citizen of Japanese origin scholars in 2008
The block chain concept of public account book, it is the technologies phases such as Distributed Storage, point-to-point transmission, common recognition mechanism, Encryption Algorithm
The new application mode of fusion.Block chain technology is verified using block linked data structure and storing data, is saved using distribution
Point common recognition algorithm guarantees the safety of data transmission and access with more new data, the mode of combining cipher to generate, and by automatic
Change the intelligent contract of scripted code composition to program the distributed basis framework and calculation paradigm completely new with one kind of operation data.
It is a kind of shared opening for meeting the internet of things era, fair competition, the true fundamental characteristics such as complete, safe and reliable bit coin
Floor layer Technology.
Summary of the invention
The present invention assuming that all information owners be all it is trusty, sharing request person be it is non-believable, i.e., it is shared to ask
It can be proposed a kind of based on property broker weight with collusion, under the premise of the user information of unauthorized access unauthorized between the person of asking
The block chain cloud storage sharing method of encryption, it has merged block chain technology and cryptological technique is a kind of shared with existing information
The technology that system is mutually compatible with.Simulation result shows that the present invention has lower be calculated as than existing information storage technology of sharing
Sheet and communication overhead, and user is more able to satisfy to the safety of information and the demand of confidentiality.
The present invention is achieved by the following technical solutions.
A kind of block chain ciphertext cloud storage sharing method based on property broker re-encryption of the present invention, by following step
It is rapid:
(S01): before carrying out information storage, system formulates intelligent contract first, and is signed jointly by information user.
(S02): information owner Alan sends storage request, verifies the transmission that pond common recognition mechanism is chosen by Pool and leads section
Masses node T of the point T into oneself clusternThe validity of verifying broadcasts information and user identity.
If 1) be temporarily stored in the log of oneself after effectively, extracting data by transmission leader node T；
If 2) invalid, " illegal user " is fed back.
(S03): masses node T of the transmission leader node T into all clustersnCopy Info and wait-for-response, in determination
The node that at least cluster internal alreadys exceed half quantity has received after information again to information owner's Alan confirmation message
It is received, it indicates that information is at this time after information owner Alan receives confirmation message and has been filed on state, T is again to TnHair
Notice informs that the data mode has been filed on.In the process, information owner Alan need to submit information offer and it is customized with
Machine character string obtains information sharing remuneration in order to user, and provides certain credit as guarantee fund, to avoid falseness,
Phenomena such as plagiarism.
(S04): transmission node sends storage information to memory node, from being responsible for the leader node M of storage to oneself cluster
Interior MiBroadcast storage request.After determining more than the completion storage of half node, to information owner's Alan feedback information, this is deposited
Storage process terminates.
(S05): sharing request person Bill sends sharing request, before information sharing, storage leader node M in cluster to
Masses' node M in oneself clusteriVerifying broadcasts user identity, determines whether it meets Cryptograph Sharing permission.
If 1) meet, from node M of the leader node M into oneself clusteriBroadcasting share request；
2) if it is not, then feeding back " illegal user ".
(S06): the keyword w provided according to sharing request person Bill, calculating will after metadata ciphertext CT in block chain
It is converted into meeting the ciphertext CT of the Share Permissions of sharing request person Bill using proxy re-encryption technologyB。
1) system generates corresponding search password TK according to public key PK, keyword w and obtains search result information and each information
Corresponding quotation.
2) sharing request person Bill credit and user sharing information price are determined, if credit is more than or equal to information valence
Lattice then enter ciphertext and convert the stage；Otherwise, " Sorry, your ticket has not enough value " is fed back.
(S07): transmission leader node T T into all clustersnNode Copy Info and wait-for-response.At least collect in determination
After the internal node for alreading exceed half quantity of group has received information, to memory node confirmation message after indicate that at this time
Information is in transmission state.
(S08): transmission node sends the metadata ciphertext obtained by keyword searching ciphertext to sharing request person Bill
CT, and the storage location LC by obtaining information after decryption, thus in corresponding position download decryption prime information ciphertext CTA, obtain
Information plaintext m.
(S09): system makees corresponding adjust and according to the data of feedback according to information exchange situation, to the credit of user
Carry out credit clearing.
Steps are as follows for more specific realization of the invention:
The present invention is mainly around three roles: cloud storage, information owner, sharing request person are designed, and Fig. 1 is this hair
Bright proposition block chain ciphertext storage system illustraton of model, Fig. 2 are that the present invention proposes block chain cipher-text information shared system illustraton of model, tool
Body character design is as follows:
1) cloud storage: it is responsible for providing memory space, user can buy corresponding memory space to CSP, convenient for storage
Record information.
2) information owner: all users possess the permission of record storage information in system, to information can encrypt and pre-
Share Permissions are first set, and only sharing request person could decrypt under the premise of meeting shared information permission obtains key, to obtain
The original plaintext message that the breath owner that wins the confidence shares, it is assumed that information owner is Alan.
3) sharing request person: user can initiate shared information request to information owner or local node in system, it is assumed that
Sharing request person is Bill.Symbol used in the present invention is as shown in table 1:
1 denotational description of table
Step 1: creation contract.
1) contract founder converts binary system contract for the contract with user property aggregating characteristic using high-level language
Code, is recorded in local network；
2) manager convenes all local users to sign contract；
3) after node confirmation signature, through ether mill deploying virtual machine in the block chain of ether mill；
4) contract address and call instruction are fed back into contract user
Step 2: election leadership's node, and verify the legitimacy of user identity.
It in the block catenary system of decentralization, is independent from each other between node, by knowing together, mechanism algorithm reaches " letter
Appoint ", each node realizes the unification of internal system information under the premise of meeting self benefits.It is verified in the present invention according to Pool
All nodes are divided into two classes: memory node, transmission node by the working principle of pond common recognition mechanism, and actual needs.Each section
Point can be at three kinds of states: leader node, election contest node and masses' node.
1) before in the initial state, information owner sends storage request, all participation nodes are all masses' nodes.
2) before being not received by leader node order, all masses' nodes can select by way of democracy is voted
Leader node is taken, who gets the most votes within the time of 150-300ms, and person's election contest node is chosen as leader node.
3) once campaigning for successfully, leader node can be according to all masses' nodes of tissue cluster internal of Raft agreement to system
Internal newest Transaction Information is transmitted, is stored；Remaining node becomes masses' node again automatically, and the instruction for obeying leader node is complete
At assigned work.
Step 3: information owner Alan submits information and provides certain guarantee gold and the shared report of user information to system
Reward, node is after the validity of confirmation transaction, cluster internal node Copy Info, after most node completion tasks and to information
Owner's Alan feedback information.
Step 4: the information that node is provided according to information owner Alan generates cipher-text information CTA, metadata Data → LC,
W, IN }, ciphertext CT, and storage request is broadcasted in cluster internal, after the most nodes of determination have completed storage, to information category
Main Alan feeds back storage result, and storage is completed.
The present invention realizes encryption, the decrypting process of information, wherein information is encrypted by property broker Re-encryption Technology
Journey is as follows:
1) system initialization: Setup (λ, U) → (GP, MSK, PK)
Given system security parameter λ, system property set U, then constructing addition cyclic group G, g that order is p is the life of G
Cheng Yuan, and exist and meet bilinear map e:G × G → GT, randomly select an integer and meet g1∈ G, and following target is set
Hash hash function H1:(0,1)2k→Zp, H2:(0,1)2k→GT, H3:(0,1)*→ G, H4:(0,1)*→ G, H5:(0,1)k→Zp,
H6:(0,1)*→ G randomly selects different integer α, a ∈ Zp, Z=e (g, g) randomly selects integer hx∈ZpIt calculatesWherein x ∈ U.
Wherein, GP indicates system common parameter, and MSK indicates that system master key, PK indicate system public key.
Key generation phase: KeyGen (GP, PK, MSK, SA)→(SKA,PKA)
Input common parameter GP, system master key MSK, information owner's Alan attribute setRandomly choose integer
t∈Zp, and generate the corresponding private key SK of information owner AlanA、PKA。
Similarly, the private key SK of sharing request person Bill is generatedB、PKB。
2) re-encrypted private key generating algorithm: RekeyGen (GP, SKA,(M',ρ'),PKB)→rkA→B
Information owner Alan takes an integer θ ∈ Z at randomp, and calculate gθ、According to the attribute of sharing request person Bill
Set SBIt constructs shared structure (M', ρ '), in conjunction with common parameter GP, the corresponding private key SK of information owner AlanA, sharing request person
The private key PK of BillB, calculate re-encrypted private key rkA→B。
rkA→B=(SA,rk1,rk2,rk3,rk4,Rx)(4)
Wherein M' is the matrix of a l' × n', and the row of matrix M' is mapped to attribute by function ρ '.Integer s is randomly selected,
y2,...,yn∈ZpConstitute ZpOne column vectorIt calculatesWherein s indicates that information owner is total
The secret enjoyed, Mi' the i-th row of homography M' vector, { εiIt is Mi'Live part, I={ i: ρ ' (i) ∈ SA,1≤i
≤ l'} indicates the attribute used in shared structure (M', ρ ').
3) information encrypts:
First step prime information encryption: input public key PKA, information owner inputs information plaintext m, and pre-set setting reads
It lookes at, Share Permissions (M, ρ), calculates ciphertext CTA, and cipher-text information is stored in Cloud Server.
Second step metadata encryption: input system public key PK and pre-set reading, Share Permissions (M, ρ), member
Data Data → { LC, w, IN }, wherein LC indicates storage location of the raw information ciphertext in cloud, and w is the keyword of information,
IN is the project number of information, and raw information ciphertext decruption key k' exports ciphertext CT, and is stored in block chain.
Ciphertext re-encryption algorithm: ReEncrypt (rkA→B,CT,PKB, (M', ρ ')) and → CTB
Node first determines whether sharing request person Bill is system contract user, if so, random selection δ ∈ GTAnd it counts
It calculates:
Then according to re-encrypted private key rkA→B, ciphertext CT calculates the important component φ of ciphertext, after final output re-encryption
Ciphertext CTB。
Wherein, ωi∈ZpAnd meet
Step 5: sharing request person Bill sends sharing request, and after confirming identity validity, node is according to sharing request person
The keyword that Bill is provided generates index code, and search password.
Index generates and keyword retrieval:
Index generates: inputting common parameter GP, the keyword w of information m, node calculates keyword w in raw informationAIt is corresponding
Message authentication code kw and re-encryption information ciphertext CTBMiddle wB' corresponding authentication code kw', generate index code ID, ID'；
Keyword retrieval: according to the corresponding private key SK of input sharing request person BillB, keyword wBAnd its corresponding search
Key kw' exports keyword wACorresponding search password TK.
Step 6: metadata ciphertext CT being obtained according to index code and search password, then determines sharing request person Bill credit
The relationship of coin and user sharing information price uses proxy re-encryption under the premise of being more than or equal to user sharing information price
Technology is converted into meeting Share Permissions (M', ρ ') the ciphertext CT of sharing request person BillB。
Step 7: transmission node Copy Info in cluster, being in for confirmation message has transmitted shape after the response of most nodes
State.
Step 8: sending the metadata ciphertext CT that retrieval obtains to sharing request person Bill, and by obtaining information after decryption
Storage location LC, thus in corresponding position download decryption prime information ciphertext CTA, obtain information plaintext m.
Information decrypting process is divided into following two step:
1) proxy re-encryption decipherment algorithm: ReDecrypt (SKB,CTB)→CT
The attribute set S of system verification sharing request person BillBCiphertext CT after whether meeting re-encryptionBIn shared knot
Structure (M', ρ '), if satisfied, private key SK can be used in sharing request person BillBDecrypt the solution encrypted by ciphertext policy ABE base
Decryption method recovers the important component φ of ciphertext, obtains CT and recovers raw information ciphertext decruption key k', Data.If discontented
Foot is fed back " illegal user ".
User obtains prime information storage location LC and decruption key k' according to metadata Data, to CTADecryption restoration is in plain text
Information m.
2) prime information ciphertext is decrypted: Decrypt (CTA,k',GP)→m
In the present invention, decruption key k' is only grasped by block chain and information owner Alan, in the case where unauthorized, is only believed
Ceasing owner Alan can be to the raw information ciphertext CT on cloud storageA, utilize formula
Decryption obtains original plaintext message m.
Step 9: according to the actual conditions of information exchange, the credit of user being adjusted correspondingly.
1) guarantee fund of sharing request person Bill interactive not successfully is returned first.
2) Successful Transaction user information expense is then settled accounts according to transaction performance.
The present invention reduces user to the complexity of information management to improve the information security in existing information interactive process
The angle of degree is set out, and combines existing attribute base Encryption Algorithm and proxy re-encryption algorithm, has been merged block chain technology, has been mentioned
The shared mould of block chain cipher-text information storage a kind of shared compatible with conventional information storage, while supporting keyword retrieval is gone out
Type.By property broker Re-encryption Technology, make information sharing that there is more flexible Compliance control characteristic.When information, owner is offline
When, node can still complete information exchange work according to intelligent contract rule, realize the uninterrupted shared of information.Keyword is made
For metadata a part there are on block chain, be convenient for information retrieval, improve the efficiency of information sharing, save to a certain extent
About communications cost alleviates the pressure of cloud storage high frequency access.
Metadata ciphertext is separated storage with prime information ciphertext by the present invention, and resistance against colluders have been better achieved, ensure that
The safety of information；The intelligent contract of information exchange is devised on the basis of block chain technology so that information sharing both sides without
Need central authority participation that can spontaneously be communicated according to presetting agreement, it is ensured that the safety of ciphertext conversion and letter
The shared high efficiency of breath.When information owner is offline, node can still complete information exchange work according to contract rule, realize
The uninterrupted of information is shared.Resistance against colluders, execution efficiency and in terms of have more advantage, be more suitable for current
Internet of things field demand for development.
Detailed description of the invention
Fig. 1 is that the present invention proposes block chain ciphertext storage system illustraton of model.
Fig. 2 is that the present invention proposes block chain cipher-text information shared system illustraton of model.
Fig. 3 is that the present invention proposes property broker re-encryption process schematic.
Fig. 4 is information exchange both sides contract execution flow chart of the present invention.
Fig. 5 is influence comparison diagram of the attribute number of the present invention to the system encryption time.
Fig. 6 is influence comparison diagram of the attribute number of the present invention to system decryption time.
Fig. 7 is influence comparison diagram of the attribute number of the present invention to the system re-encryption time.
Fig. 8 is influence comparison diagram of the attribute number of the present invention to system weight decryption time.
Specific embodiment
Illustrate the present invention in order to more detailed, it below will the invention will be further described with specific example.
Embodiment 1.Contract user information interaction example procedure in the present invention.
1) information owner Alan send storage request, while submit information offer and customized random string in order to
User obtains information sharing remuneration.
2) masses node T of the transmission leader node T into oneself cluster in clusternVerifying broadcasts information and user identity
Validity.If being temporarily stored in the log of oneself after effectively, extracting data by transmission leader node T；If nothing
Effect, then feed back " illegal user ".
3) all masses node Ts of the transmission leader node T into clusternCopy Info and wait-for-response are determining at least
The node that cluster internal alreadys exceed half quantity received after information again to information owner Alan confirmation message
It receives, indicates that information is at this time after user receives confirmation message and have been filed on state, T is again to TnIt sends out public notice and informs the number
It is had been filed on according to state.In the process, information owner Alan need to submit information offer and customized random string so as to
Information sharing remuneration is obtained in user, and provides certain credit as guarantee fund, phenomena such as to avoid false, plagiarism.
4) transmission node sends storage information to memory node, from being responsible for M of the node M of storage into oneself clusteriExtensively
Broadcast storage request.After determining more than the completion storage of half node, metadata Data is stored according to the Share Permissions (M, ρ) of setting
→ { LC, w, IN } obtains ciphertext CT, and to information owner's Alan feedback information, this time stores work and completes.
5) sharing request person Bill sends sharing request and submits certain credit to system to guarantee the true of request
Validity.Masses node M of the storage leader node M into oneself cluster before information sharing, in clusteriVerifying broadcasts user
Identity, determines whether it meets Cryptograph Sharing permission (M, ρ).If meeting, from node M of the leader node M into oneself clusteri
Broadcasting share request.If it is not, then feeding back " illegal user ".
6) sharing request person Bill credit and user sharing information price are further determined that, if credit is more than or equal to letter
Price is ceased, then enters ciphertext and converts the stage, be converted into according with using proxy re-encryption technology by it after obtaining number metadata ciphertext CT
Amount to Share Permissions (M', ρ ') the ciphertext CT for enjoying requestor BillB.Otherwise, " Sorry, your ticket has not enough value " is fed back.
7) leader node T T into all clusters is transmittednNode Copy Info and wait-for-response.It is determining at least cluster
After the node that portion alreadys exceed half quantity has received information, to memory node confirmation message after indicate that information at this time
In transmission state.
8) transmission node sends the metadata ciphertext CT obtained by keyword searching ciphertext to sharing request person Bill, and
By obtaining the storage location LC of information after decryption, thus in corresponding position download decryption prime information ciphertext CTA, it is bright to obtain information
Literary m.
9) system is according to information exchange as a result, carrying out credit clearing to information exchange two parties according to the data of feedback
Credit make the update situation of change of corresponding adjustment and confirmation message.User guarantee fund interactive not successfully is returned first,
Then according to transaction performance, customer interaction information expense is settled accounts.
Embodiment 2.Information exchange intelligence contract implementation procedure.
It has been designed into a large amount of user and information in the present invention, in order to be more convenient trading processing, has been drawn sequentially in time
It is divided into following several stages: contract publication, publication transaction, authentication, Security Checking, settlement of transactions.It is specifically stated in conjunction with Fig. 4
It is as follows:
1) formulate contract: contract founder converts two for the contract with user property aggregating characteristic using high-level language
System contract code, is recorded in local network, while all local users being convened to sign contract, is confirmed by node and is signed
Afterwards, through ether mill deploying virtual machine in the block chain of ether mill, and to user feedback contract address and call instruction.
2) publication transaction: information owner Alan according to the Share Permissions (M, ρ) that pre-set store metadata Data →
{ LC, w, IN } obtains ciphertext CT, meanwhile, information owner Alan submit information quotation and customized random string in order to
Family obtains information sharing remuneration, and in the process, information owner Alan also needs to provide certain credit to contract address and makees
For guarantee fund, to avoid it is false, plagiarize phenomena such as.
3) authentication: in the authentication stage, system is according to the attribute set S of sharing request person BillBWith set in advance
The permission set (M, ρ) set carries out permission match, and result is submitted to intelligent contract.Intelligent contract is according to public key PK, pass
Keyword w generates corresponding search password TK and obtains search result information and the corresponding quotation of each information.
4) Security Checking: in the Security Checking stage, intelligent contract determines sharing request person Bill credit and user sharing
Information price enters ciphertext and converts the stage if credit is more than or equal to information price；Otherwise, " Sorry, your ticket has not enough value " is fed back.
5) settlement of transactions: system is according to information exchange as a result, making corresponding adjustment and confirmation message to the credit of user
Update situation of change, then according to the data of feedback carry out credit clearing.User interactive not successfully is returned first to guarantee
Gold settles accounts customer interaction information expense then according to transaction performance.
Embodiment 3.Safety analysis of the invention.
A) Security Proof of information exchange:
The present invention is to carry out Security Proof based on q-parallel BDHE difficulty problem, and judge bilinearity difficulty
Property problem, if it is assumed that setting up, i.e. the opponent under random oracle modelAdvantageIt ignores, i.e., explanation should
Invention is selection plaintext secure (CPA, Chosen Plaintext Attack).
If 1 present invention of theorem solve the problems, such as the advantage of q-parallel BDHE be it is negligible, claim q-
Parallel BDHE assumes in (G, GT) set up, which is CPA safety under random oracle model.
It proves to assume that there are an attackersIn CPA game, its advantageIt can not ignore, oppose
Hand wins safe game.Then construct a game challengerIf there is attackerIt is broken through under security model with the advantage of ξ
CPA, it is only necessary to prove challengerIt can be by attackerProbability of the ability can not ignoreSolve prejudgementing character q-
The problem of parallel BDHE.
Initial phase: game challengerIt will will receive from attackerShare Permissions structure (the M of transmission*,ρ*)。
System establishment stage: challengerRandomly choose value χ ' a ∈ Zp, calculate: e (g, g)α=e (g, g)χ′e(g,gα)
And GP and PK are sent to attacker
Inquiry phase 1: private key extracts the stage: attackerBy to challengerSubmit property setChallengerWith
Machine chooses τ ∈ ZpCalculate (i, SKi), and by SKAIt is sent to attacker
Re-encrypted private key extracts the stage: with a property set SiKey is carried out with a Share Permissions structure (M', ρ ') to mention
It takes, it is first determined whether meeting (M', ρ '), if satisfied, can then obtain private key SKA, then calculate rkA→B=(S, rk1,rk2,
rk3,rk4,Rx), otherwise, challengerIt arbitrarily selects one and feeds back to attacker
The challenge stage: attackerThe message m of two sections of equal lengths is sent at random0And m1To challengerChallengerWith
Machine extracts a bits attributes b ∈ (0,1), utilizes (M*,ρ*) to mbEncryption obtains ciphertext CT and is sent to
Inquiry phase 2: the operation of inquiry phase 1 is repeated.
The conjecture stage:A b' ∈ (0,1) is provided to guess the challenger in the challenge stageThe b=0 or b=of selection
1, if conjecture is correct, i.e. b'=b, then A wins this game.If attackerGuess result b' ≠ b, then guesses mistake.We
Define challengerAdvantage:
When output is 0, i.e.,It cannot get any about mbAny information, cannot restore in plain text, therefore guess correct
Probability beWhen output is 1, i.e.,It obtains any about mbRelated cipher-text information, and can restore in plain text, not by theorem 1
It is rare to go out to guess that the correct probability obtained is
Therefore, q-paralle BDHE conjecture in the present invention is accurate, i.e. the advantage of b'=b is
I.e. the present invention can achieve the purpose for challenging plaintext attack.
Resistance against colluders: the present invention uses property broker re-encryption algorithm (such as Fig. 1), user property collectionWith
Shared structure (M, ρ) passes through A2It is verified, rk1、rk3、RxWith rk4Pass through δ ∈ GTAssociation, rk1、rk2And rk4Pass through θ ∈ ZpTightly
It is close to be connected, rk4In θ ∈ ZpAnd to δ ∈ G under Share Permissions structure (M, ρ)TIt is encrypted, so working as rk1、rk2、rk3、RxValue
Distorting its corresponding re-encryption ciphertext by attacker, also it is invalid, if(M, ρ) and rk4It is tampered, then can be with
Pass through following formulaVerifying.
Due to the special tectonic of the system, transmission node and memory node are separated, refer to Pool verifying pond common recognition
Mechanism, memory node are to be generated by way of democratic election, therefore ensure that the randomness for executing node with transmission node
And the ambiguity of position.I.e. memory node neither knows next transmission node position, does not know about sharer's information more, node
Randomness determines the difficulty that three gangs up, therefore memory node, transmission node, a possibility that ganging up between sharer three
It is extremely low.
Embodiment 4.Efficiency analysis of the invention.
Communication overhead in the present invention mainly have communication between transmission node and memory node and node and system it
Between communication composition.Efficiency in system for further evaluation, in conjunction with the property broker re-encryption safety based on code key strategy
Cross-domain proxy re-encryption friend in the mobile social networking of shared Tiwari method, Luo Entao et al. has found that secret protection is ground
Study carefully and the Seo method of the matching operation based on property broker re-encrypted constant number has done comparative experiments.
By system public key PK, the MSK length with following three kinds of methods, private key for user SK length and CT length are carried out pair
Than the results are shown in Table 2.As seen from table, compared to Tiwari method, Luo method, system public key PK of the invention is with attribute
The increase of number, length gradually increase, and private key for user SK length growth rate is therefore of the invention close also much larger than other three kinds of methods
Key has higher anti-attack ability.Using the attribute of user as one of each private key for user SK foundation generated, while also can
The enough more flexible control for realizing Share Permissions, converts shared structure for user property in ciphertext, carries out to ciphertext
The more effective protection of orientation.
The comparison of 2 communication overhead of table
For in algorithm encryption, re-encryption, ciphertext decryption and re-encryption ciphertext decrypting process required for calculation amount, and
It is compared with existing three kinds of typical methods, the results are shown in Table 3, wherein E is for describing group G, GTThe duration of power operation,
And P indicates bilinear logarithm operation duration, n indicates attribute number.As shown in Table 3, the bilinearity in Seo method is accomplished that
The "AND" relational operation between attribute is only supported with door access structure, and any Share Permissions formula of support of the invention, more
It is flexible convenient.The present invention makes bilinearity logarithm required for reducing compared with Tiwari method, using multiplying is increased
Operation, therefore operation cost of the invention will be much smaller than the operand of both the above method, so that having reached reduces computing cost
Purpose.Compared to Luo method, algorithm complexity of the invention also be decreased significantly.
The comparison of 3 computing cost of table
The present invention efficiency in system for further evaluation, the present invention is to Seo method, Tiwari method, Luo method three
Kind method has done comparative experiments, and four methods are to use Tate Bilinear Pairing to be wanted according to the experimental result of Chen et al.
Reach the RSA security level of 1024bit, the Tate Bilinear Pairing operation of 512bit, and executes a Tate Bilinear Pairing
The operation used time is 20.04ms, executes first power exponent arithmetic 5.31ms.Experimentation of the invention is the category held according to user
Property number as variable, respectively to encryption, decryption, re-encryption, again decryption operation time carried out simulation comparison.
Fig. 5 explanation is incremented by with attribute number, and the calculating time of encryption is also increasing, in order to better ensure that the peace of information
Quan Xing, invention increases the numbers of attributes match in ciphering process, therefore consumption is slightly above Seo when operation.Fig. 6 is prime information solution
Close duration, the present invention have absolute advantage relative to Tiwari, Luo.The present invention is using block chain technology by different node point
Data center's calculating task is carried on a shoulder pole, the calculation times of the Bilinear Pairing of trusted party are reduced, therefore on computing cost more
It is advantageous.Fig. 7 is the situation of change for calculating the time in the re-encryption stage, and four kinds of methods are required to Share Permissions and match, in the present invention
Information for holding 100 characteristic attributes, which encrypts, only needs 1.70s or so, and compared to Seo method, Tiwari method wants small very
It is more.Fig. 8 shows with the increase of attribute number purpose solves confidential information again when consumption, with attribute number purpose increase, compared to other three kinds
The growth rate of method, decryption duration of the invention is minimum.
Claims (1)
1. a kind of block chain ciphertext cloud storage sharing method based on property broker re-encryption, it is characterized in that as follows:
(S01): before carrying out information storage, system formulates intelligent contract first, and is signed jointly by information user；
(S02): information owner Alan sends storage request, verifies the transmission leader node T that pond common recognition mechanism is chosen by Pool
Masses' node T into oneself clusternThe validity of verifying broadcasts information and user identity；
If 1) be temporarily stored in the log of oneself after effectively, extracting data by transmission leader node T；
If 2) invalid, " illegal user " is fed back；
(S03): masses node T of the transmission leader node T into all clustersnCopy Info and wait-for-response at least collect in determination
The internal node for alreading exceed half quantity of group has connect to information owner's Alan confirmation message again after having received information
It receives, indicates that information is at this time after information owner Alan receives confirmation message and have been filed on state, T is again to TnIt sends out public notice announcement
Know that the data mode has been filed on；In the process, information owner Alan needs to submit information quotation and customized random character
String obtains information sharing remuneration in order to user, and provides certain credit as guarantee fund, to avoid false, plagiarism is existing
As；
(S04): transmission node sends storage information to memory node, from being responsible for M of the leader node M of storage into oneself clusteri
Broadcast storage request；After determining more than the completion storage of half node, to information owner's Alan feedback information, this storing process
Terminate；
(S05): sharing request person Bill sends sharing request, before information sharing, storage leader node M in cluster to oneself
Masses' node M in clusteriVerifying broadcasts user identity, determines whether it meets Cryptograph Sharing permission；
If 1) meet, from node M of the leader node M into oneself clusteriBroadcasting share request；
2) if it is not, then feeding back " illegal user "；
(S06): the keyword w provided according to sharing request person Bill, calculating in block chain is made after metadata ciphertext CT
It is converted into meeting the ciphertext CT of the Share Permissions of sharing request person Bill with proxy re-encryption technologyB；
1) system generates corresponding search password TK acquisition search result information according to public key PK, keyword w and each information is corresponding
Quotation；
2) sharing request person Bill credit and user sharing information price are determined, if credit is more than or equal to information price,
The stage is converted into ciphertext；Otherwise, " Sorry, your ticket has not enough value " is fed back；
(S07): transmission leader node T T into all clustersnNode Copy Info and wait-for-response；Determining at least cluster internal
Already exceed half quantity node received information after, to memory node confirmation message after indicate that at information at this time
In transmission state；
(S08): transmission node sends the metadata ciphertext CT obtained by keyword searching ciphertext to sharing request person Bill, and
By obtaining the storage location LC of information after decryption, thus in corresponding position download decryption prime information ciphertext CTA, it is bright to obtain information
Literary m；
(S09): system is made corresponding adjustment to the credit of user and is carried out according to the data of feedback according to information exchange situation
Credit clearing.
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| CN113193953A (en) * | 2021-04-16 | 2021-07-30 | 南通大学 | Multi-authority attribute-based encryption method based on block chain |
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| CN113556363A (en) * | 2021-09-18 | 2021-10-26 | 中国人民解放军国防科技大学 | Data sharing method and system based on decentralized and distributed proxy re-encryption |
| CN114520747A (en) * | 2022-04-21 | 2022-05-20 | 山东省计算中心（国家超级计算济南中心） | Data security sharing system and method taking data as center |
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| CN115714669A (en) * | 2022-10-20 | 2023-02-24 | 云南师范大学 | Private data cross-domain sharing method based on PURH-CP-ABE under block chain |
| CN115714669B (en) * | 2022-10-20 | 2024-02-06 | 云南师范大学 | Private data cross-domain sharing method based on PURH-CP-ABE under blockchain |
| CN116455596A (en) * | 2023-02-16 | 2023-07-18 | 广东顺德电力设计院有限公司 | Virtual power plant data security protection method based on consensus mechanism |
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