CN109583893A - The traceable digital cash transaction system based on block chain - Google Patents
The traceable digital cash transaction system based on block chain Download PDFInfo
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- CN109583893A CN109583893A CN201811393040.1A CN201811393040A CN109583893A CN 109583893 A CN109583893 A CN 109583893A CN 201811393040 A CN201811393040 A CN 201811393040A CN 109583893 A CN109583893 A CN 109583893A
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- 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
- G06Q20/00—Payment architectures, schemes or protocols
- G06Q20/38—Payment protocols; Details thereof
- G06Q20/382—Payment protocols; Details thereof insuring higher security of transaction
- G06Q20/3829—Payment protocols; Details thereof insuring higher security of transaction involving key management
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- 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
- G06Q20/00—Payment architectures, schemes or protocols
- G06Q20/04—Payment circuits
- G06Q20/06—Private payment circuits, e.g. involving electronic currency used among participants of a common payment scheme
- G06Q20/065—Private payment circuits, e.g. involving electronic currency used among participants of a common payment scheme using e-cash
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Abstract
The invention discloses a kind of traceable digital cash transaction systems based on block chain, comprising: certificate request module generates corresponding parameter and public and private key for certificate authority and transaction sending node；Certificate release module is signed for public key of the certificate authority to transaction sending node, generates the certificate of transaction sending node；Certificate randomization module is randomized the certificate that terminal device obtains for sending node of trading, and the certificate after randomization is sent to remote verification terminal；Digital cash transaction modules carry out the digital cash transaction based on block chain for trading between sending node, miner's node and transaction acceptance node；User identity tracing module is tracked for identity of the certificate authority to transaction sending node.The system, which passes through, combines existing PKI system and digital money transaction system to enhance the scalability of system so that system has good cross-platform characteristic, and ensures the anonymity and traceability of terminal device.
Description
Technical field
The present invention relates to block chain and digital cash technical field, in particular to a kind of traceable number based on block chain
Word money transaction system.
Background technique
In recent years, the innovation and development of informationization technology, development of Mobile Internet technology and cloud computing technology, changes deeply
The means of payment of people.It is even more to indicate to believe by the birth of the digital cash based on block chain of representative and circulation of bit coin
Breath generates the internet being characterized with flowing and accelerates to march toward the value internet new era characterized by being worth and generate with transfer.
Have many characteristics, such as that center, the digital cash that can not be forged can eliminate conventional currency design printing and escort the cost of storage,
Cross-region, the flow of fund obstacle across mechanism are reduced, the convenience and transparency of transaction are promoted, is to adapt to modernization and net
The form of money of network demand.Block chain is one kind for becoming increasingly popular and gradually rising with the digital encryptions currency such as bit coin
Decentralization architecture, the unique job mechanism of all-web authentication make it have anti-take advantage of in distributed system and P2P node
It deceives, prevent the characteristics of dual payment, to guarantee the safety and stablization of digital coin systems.Through development and improvement in a few years, area
Block chain has been increasingly becoming a kind of novel distribution, decentralization, the technical solution for going trustization.
The generation of digital cash and the innovation and development of block chain while bringing change to social production, are also to transaction
More stringent requirements are proposed for information security and personal privacy protection in system.The digital coin systems such as bit coin are only capable of providing at present
The secret protection of weaker assumed name mode.In addition, the design of existing digital cash transaction system got around it is any it is existing tissue or
The supervision of mechanism.Due to the missing of oversight mechanism, so that doing credit endorsement without any mechanism or tissue for it, it is easy to cause out
Existing excessively high currency fluctuation, and breed using the tax evasion of the digital cash such as bit coin, extort money laundering etc. and break laws and commit crime.How to mention
For the secret protection of dealer, how to execute the efficient supervision of registration body, how the secret protection in hedge system with
The problem of security control etc. etc. all suffers from urgent need to resolve and challenge.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.
For this purpose, it is an object of the invention to propose a kind of traceable digital cash transaction system based on block chain.
In order to achieve the above objectives, the invention proposes the traceable digital cash transaction systems based on block chain, comprising:
Certificate request module generates card for creating the system parameter of digital cash transaction system, and according to the system parameter respectively
The public and private key of book certification authority and the public and private key of transaction sending node, and chased after according to the generation of the public and private key of the certificate authority
Track parameter；Certificate release module, for according to the private key of the certificate authority to the public key of the transaction sending node into
Row signature generates certificate, and the certificate and the trace parameters are added in certificate repository；Certificate is randomized module, is used for institute
It states transaction sending node and signature verification is carried out to the certificate, and after confirming that the certificate is effective, the transaction sending node
The public key of the certificate and the terminal device is randomized, and the certificate after randomization is sent to digital cash transaction
Module；Digital cash transaction modules initiate the transaction to transaction acceptance node for the transaction sending node, generate transaction
Single, miner's node collects the trading card, and is reached common understanding between miner's node based on POW common recognition mechanism and generate new district
Block completes transaction in the form of block chain；And user identity tracing module, for obtaining the tracking ginseng from the certificate repository
Number, and according to the public key of the terminal device after randomization to the terminal device be tracked with realize to user identity into
Row tracking.
The traceable digital cash transaction system based on block chain of the embodiment of the present invention, by combining existing public key base
The digital cash transaction system such as Infrastructure PKI architectural framework and bit coin, so that system has good cross-platform characteristic, enhancing
The scalability of system, and ensured the anonymity and traceability of terminal device.
In addition, the traceable digital cash transaction system based on block chain according to the above embodiment of the present invention can be with
With following additional technical characteristic:
Further, in one embodiment of the invention, the certificate request module and the certificate are randomized module
Operation completed by user terminal, the operation of the certificate release module and the user identity tracing module is by the certificate verification
Mechanism completes, and the operation of the digital cash transaction modules is by the transaction sending node, miner's node and the transaction
Receiving node is completed.
Further, in one embodiment of the invention, the transaction sending node is the initiation of digital cash transaction
Side, the transaction acceptance node are the recipient of digital cash transaction.
Further, in one embodiment of the invention, the certificate request module is specifically used for: handing in digital cash
The system parameter of the certificate authority and the transaction sending node is created in easy system；The certificate authority utilizes
The corresponding system parameter of the certificate authority generates public private key pair, saves private key, announces public key；The transaction sending node
Generate public private key pair using the corresponding system parameter of the transaction sending node, save private key, send public key and trace parameters to
The certificate authority.
Further, in one embodiment of the invention, the certificate release module is specifically used for: receiving the certificate
Apply for that the public key of the transaction sending node in module, the certificate authority are corresponding using the certificate authority
Private key signature carried out to the public key of the transaction sending node generate certificate, and the certificate is sent to transaction transmission
Node；The certificate authority registers the transaction sending node in certificate registration unit, and by the friendship
The certificate of easy sending node and the trace parameters are added in certificate repository.
Further, in one embodiment of the invention, the certificate randomization module is specifically used for: the transaction hair
After sending node to receive certificate, signature verification is carried out to the certificate；The transaction sending node to the certificate that is verified and
Public key is randomized；It proves that the validity of certificate will be randomized using zero-knowledge proof technology, and will be after the randomization
Certificate is sent to digital cash transaction modules.
Optionally, in one embodiment of the invention, if the certification authentication that the transaction sending node receives passes through,
The then transaction sending node output 1, receives certificate；If the certification authentication that the transaction sending node receives does not pass through,
The transaction sending node output 0, and warning message is returned to the certificate authority.
Further, in one embodiment of the invention, the digital cash transaction modules are specifically used for: the transaction
Sending node generates the trading card comprising the randomization certificate of the transaction acceptance node, and is sent to miner's section
Point；After miner's node receives the trading card, to the certificate and trading card progress validity after the randomization
Verifying；Reached common understanding between miner's node based on POW common recognition mechanism and generate new block, and to the friendship in the form of block chain
Yi Dan is recorded, and transaction is completed.
Further, in one embodiment of the invention, the user identity tracing module is specifically used for: the certificate
After certification authority receives user identity tracking request, the certificate authority transfers all terminal device registrations in certificate repository
When trace parameters；The certificate authority according to it is described randomization certificate after public key and relevant parameter to user identity into
Row tracking.
The additional aspect of the present invention and advantage will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Above-mentioned and/or additional aspect and advantage of the invention will become from the following description of the accompanying drawings of embodiments
Obviously and it is readily appreciated that, in which:
Fig. 1 is the traceable digital cash transaction system structural representation based on block chain of one embodiment of the invention
Figure；
Fig. 2 is the traceable digital cash transaction system frame diagram based on block chain of one embodiment of the invention；
Fig. 3 is the traceable digital cash transaction system general flow chart based on block chain of one embodiment of the invention；
Fig. 4 is the certificate request of the traceable digital cash transaction system based on block chain of one embodiment of the invention
Module, certificate release module and certificate are randomized module journey schematic diagram；
Fig. 5 is the digital cash of the traceable digital cash transaction system based on block chain of one embodiment of the invention
Transaction modules schematic diagram；
Fig. 6 is the user identity of the traceable digital cash transaction system based on block chain of one embodiment of the invention
Tracing module schematic diagram.
Specific embodiment
The embodiment of the present invention is described below in detail, the example of embodiment is shown in the accompanying drawings, wherein identical from beginning to end
Or similar label indicates same or similar element or element with the same or similar functions.It is retouched below with reference to attached drawing
The embodiment stated is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
The traceable digital cash based on block chain for describing to propose according to embodiments of the present invention with reference to the accompanying drawings is handed over
Easy system.
Fig. 1 is the traceable digital cash transaction system structural representation based on block chain of one embodiment of the invention
Figure.
As shown in Figure 1, the traceable digital cash transaction system 10 based on block chain includes: certificate request module
100, certificate release module 200, certificate randomization module 300, digital cash transaction modules 400 and user identity tracing module
500。
It should be noted that the digital cash transaction system of the embodiment of the present invention includes: certificate authority CA
(Certificate Authority), transaction sending node, miner's node and the big entity of transaction acceptance node four.Wherein, certificate
Certification authority CA (Certificate Authority) is that mechanism is signed and issued and tracked to certificate, it is the core of PKI system；It hands over
Easy sending node is the sender of digital cash transaction system and the user of PKI certificate；Transaction acceptance node is digital goods
The recipient of coin transaction system；Miner's node is the verifier for the randomization certificate that transaction sends user.
Wherein, certificate request module 100 is used to create the system parameter of digital cash transaction system, and according to system parameter
The public and private key of certificate authority and the public and private key of transaction sending node are generated respectively, and according to the public and private key of certificate authority
Generate trace parameters.
Further, in one embodiment of the invention, certificate request module 100 is specifically used for: handing in digital cash
The system parameter of creation certificate authority and sending node of trading in easy system；Certificate authority certificate of utility certification authority
Corresponding system parameter generates public private key pair, saves private key, announces public key；Sending node of trading is corresponding using transaction sending node
System parameter generate public private key pair, save private key, send public key and trace parameters to certificate authority.
In other words, the implementation procedure of certificate request module 100 are as follows:
Step 1:CA mechanism and transaction sending node create corresponding system parameter；
Step 2:CA mechanism generates the public private key pair of oneself using system parameter, saves private key, announces public key；
Step 3: transaction sending node generates oneself public private key pair using system parameter, saves private key, send public key and
Trace parameters give CA mechanism.
It should be noted that the operation of certificate request module 100 and certificate randomization module 300 is completed by user terminal, demonstrate,prove
The operation of book release module 200 and user identity tracing module 500 is completed by certificate authority, digital cash transaction modules
400 operation is completed by transaction sending node, miner's node and transaction acceptance node.
Certificate release module 200 is used to sign to the public key of transaction sending node according to the private key of certificate authority
Certificate is generated, and certificate and trace parameters are added in certificate repository.
Further, in one embodiment of the invention, certificate release module 200 is specifically used for: receiving certificate request
The public key of transaction sending node in module, the corresponding private key of certificate authority certificate of utility certification authority send transaction
The public key of node carries out signature and generates certificate, and sends the certificate to transaction sending node；Certificate authority is registered in certificate
Transaction sending node is registered by mechanism, and the certificate for sending node of trading and trace parameters are added to certificate repository
In.
Briefly, the implementation procedure of certificate release module 200 are as follows:
Step 1: after the public key for receiving transaction sending node, client public key is signed using the private key of oneself by CA mechanism
Name generates certificate, and sends the certificate to user；
Transaction sending node is simultaneously registered by step 2:CA mechanism, and user certificate and trace parameters are added
Into certificate repository.
Certificate randomization module 300 carries out signature verification to certificate for trading sending node, and effective in confirmation certificate
Afterwards, transaction sending node is randomized the public key of certificate and terminal device, and the certificate after randomization is sent to number
Moneytary operations module.
Further, in one embodiment of the invention, certificate randomization module 300 is specifically used for: transaction sends section
After point receives certificate, signature verification is carried out to certificate；Transaction sending node carries out the certificate and public key being verified random
Change；It will be randomized the validity of certificate using zero-knowledge proof technology proof, and the certificate after randomization is sent to digital goods
Coin transaction modules 400.
Wherein, if the certification authentication that transaction sending node receives passes through, sending node of trading output 1 receives certificate；
If the certification authentication that transaction sending node receives does not pass through, sending node of trading output 0, and warning message is returned to certificate
Certification authority.
In other words, the implementation procedure of certificate randomization module are as follows:
Step 1: after receiving certificate, transaction sending node carries out signature verification to certificate.If certificate passes through verifying, output
1, receive the certificate.Otherwise user's output 0, and return to information warning ⊥ and give CA mechanism；
Step 2: user is randomized the certificate and public key that are verified；
Step 3: user has carried out effective randomization (i.e. user holds and certificate master using zero-knowledge proof technology proof
The corresponding private key of the public key of body).
Digital cash transaction modules 400 initiate the transaction to transaction acceptance node for sending node of trading, and generate transaction
Single, miner's node collects trading card, and is reached common understanding between miner's node based on POW common recognition mechanism and generate new block, with area
Block chain form completes transaction.
Further, in one embodiment of the invention, digital cash transaction modules 400 are specifically used for: transaction is sent
Node generates the trading card comprising randomization certificate of transaction acceptance node, and is sent to miner's node；Miner's node receives
After trading card, to the certificate and trading card progress validation verification after randomization；It is reached between miner's node based on POW common recognition mechanism
New block is generated at common recognition, and trading card is recorded in the form of block chain, completes transaction.
Specifically, the implementation procedure of digital cash transaction modules 400 are as follows:
Step 1: transaction sending node generates the trading card comprising randomization certificate to transaction acceptance node；
Step 2: after miner is collected into trading card, validation verification being carried out to trading card and randomization certificate；
Step 3: being reached common understanding between miner based on POW common recognition mechanism and generate new block, and ultimately form block chain form
Trading card is recorded, transaction is completed.
User identity tracing module 500 is set for obtaining trace parameters from certificate repository according to the terminal after randomization
Standby public key is tracked to realize and be tracked to user identity terminal device.
That is, certificate authority transfers certificate repository after certificate authority receives user identity tracking request
In all terminal devices registration when trace parameters；Certificate authority is according to the public key and relevant parameter pair after randomization certificate
User identity is tracked.
It should be noted that in an embodiment of the present invention, the format of certificate meets X509.V3 specification and have can be random
Property, transaction sending node has identity traceability.
Below with reference to specific example as shown in figures 2-6 to the traceable number based on block chain of the embodiment of the present invention
Money transaction system is completely described.
As shown in Fig. 2, including: certificate authority CA, transaction transmission user, transaction acceptance in specific example of the invention
User and miner.It should be noted that the transaction referred in specific example sends user and user is the above-mentioned transaction referred to
Sending node, transaction acceptance user are the above-mentioned transaction acceptance node referred to, and miner is the above-mentioned miner's node referred to.
Wherein, in this specific example, the model of CA server and database server is Dell OptiPlex
3046Mini Tower, transaction sends user and the host model of transaction acceptance user terminal associates ThinkCentre E74S
Tower simultaneously installs bit coin wallet Bitcoin Core for digital cash transaction, and purchase F2Pool mine pond software is used for miner
Mine is dug, network environment is campus-level network environment.
As shown in Figures 3 and 4, CA mechanism and transaction transmission user need creation corresponding public in certificate request module 100
Parameter generates respective public private key pair, and user needs to fill in personal certificate application form, and wherein client public key is confirmation user identity
Primary fields, other identifier symbol be option.The address Email is to use when transmitting certificate after generating certificate, it is necessary to which input has
Otherwise the address of effect is applied unsuccessful.Specifically includes the following steps:
Step 1:CA mechanism and transaction send user and create corresponding system parameter.
Enable G1, G2And GTIt is three p rank cyclic groups (p is prime number), e:G1×G2→GTIt is the Bilinear map of the 3rd seed type,
That is G1≠G2, G1With G2Between be not present any effective Homomorphic Mapping.DefinitionOutput system parameter pp ← (p,
G1,G2,GT,e)。
Step 2:CA mechanism generates the public private key pair (cpk, csk) of oneself using system parameter pp, saves private key csk, public
Cloth public key cpk.
CA mechanism randomly selectsIt calculatesGeneration private key csk=(x,
Y), public keyCA mechanism saves private key csk, announces public key cpk.
Step 3: transaction sends the public private key pair (upk, usk) that user generates oneself using system parameter pp, saves private key
Usk sends public key upk and gives CA mechanism.Parameter needed for generating tracing module according to the public key cpk of CA mechanism simultaneously.
User randomly selects g ← G1, α ← Zp, generation private key is usk=α, and public key isIt calculates simultaneouslyUser saves private key usk, sends public key upk and trace parameters T
Give CA mechanism.
As shown in Figures 3 and 4, after client public key and relevant parameter being received in certificate release module 200, CA mechanism is utilized
The private key of oneself carries out signature generation certificate to client public key and is sent to transaction transmission user, while stepping on to certificate user
User certificate and trace parameters, are finally added in certificate repository by note registration.Specifically includes the following steps:
Step 1: after receiving client public key upk, CA mechanism carries out signature generation to client public key using the private key of oneself
Certificate Cert, and certificate Cert is sent to user.
After receiving client public key upk=(X, Y), CA mechanism randomly selects r ← Zp, calculate upkr=(X, Y)r=(gr,gαr), generate signature sigma=(gr,grX·gαr·Y)=(gr,gr(X+Yα))=(σ1,σ2).CA mechanism is by signature sigma=(σ1,σ2) as card
Book Cert is sent to user.
Certificate user is simultaneously registered by step 2:CA mechanism, and user certificate Cert and trace parameters T are added
It is added in certificate repository.
As shown in Figures 3 and 4, transaction sends the validity that user first verifies that certificate in certificate randomization module 300.If
Certificate is randomized the certificate and public key and proves to have carried out effective randomization operation by verifying, user.If certificate
It is unverified, then it returns to information warning ⊥ and gives CA mechanism.Specifically includes the following steps:
Step 1: after receiving certificate Cert, user carries out signature verification to certificate, verifies the validity of certificate.
Receive certificate Cert=σ=(σ1,σ2), whether first verify that hasSecondly verifying equationIt is whether true.If equation is set up, output 1 receives the certificate.Otherwise user's output 0, and return
It returns information warning ⊥ and gives CA mechanism.
Step 2: if certificate, by verifying, user is randomized the certificate and public key that are verified.
User randomly selects u ← Zp, calculate g1=gu,Public key upk ' after being randomized=
(g1,X1)。
User randomly selects v ← Zp, calculateCertificate Cert '=σ ' after being randomized=
(σ′1,σ′2)。
Step 3: user has carried out effective randomization (i.e. user holds and certificate master using zero-knowledge proof technology proof
The corresponding private key of the public key of body).
User has carried out effective randomization operation using correct private key really to prove oneself, calculates first
It is calculated later using non-interactive zero-knowledge proof agreement (Non.InteractiveZeroKnowledge, NIZK)End user by after randomization certificate and prove parameter Cert "=
(Cert′,σ3,σ4)=(σ '1,σ′2,σ3,σ4) it is used for digital cash transaction modules.
As shown in Figures 3 and 5, transaction sends user's generation to transaction acceptance user's in digital cash transaction modules 400
Trading card, the trading card not only include the I/O Address required in general transaction list and sender's signature, further include random
Certificate and proof parameter after change.Based on digital coin systems such as existing bit coin, the miner in mine pond collects trading card, to friendship
Yi Dan and randomization certificate carry out validation verification.Reached common understanding between miner based on POW common recognition mechanism and generate new block, and most
End form records trading card at block chain form, completes transaction.
Specifically includes the following steps:
Step 1: it includes the trading card for being randomized certificate that transaction, which sends user and generates to transaction acceptance user,.
Transaction sends transaction of user's initiation to transaction acceptance user, generates trading card.Trading card includes the label of sender
Name verification public key, recipient's public key, transaction amount, sender is to the signature of trading card and the randomization public key and card of sender
Book.Signature algorithm is signed using ECDSA herein, and specific ECDSA signature is as follows:
If ECDSA signature algorithm system parameter is (Fq, E, G, n, a, b, h), wherein FqIt is finite field, E is FqOn ellipse
Curve, G are a basic points on E, and the rank of G is n (n is prime number), and a, b are the coefficients of elliptic curve E, and h is one-way safety
Hash function.If transaction sends the signature key of user to for (upkt,uskt)=(Q, d), wherein Q=dG, transaction to be signed are believed
Breath is m.
A random number k is chosen, 1≤k≤n-1 calculates kG=(x1,y1), r=x1Modn, e=H (m), s=k-1(e+
Dr), generate transaction and send user to the signature sigma of trading card information mt=(r, s).
Step 2: after miner is collected into trading card, validation verification being carried out to trading card and randomization certificate.
(1) trading card signature-verification process: after miner is collected into trading card, signature sigma is obtainedt=(r, s) calculates e=H
(m), w=s-1modn；Calculate u1=ewmodn, u2=rwmodn, u1G+u2Q=(x0,y0)；Calculate v=x0modn；If v=r,
Then signature passes through verifying, otherwise authentication failed.
(2) it is randomized credentials verification process: receiving certificate Cert "=(Cert ', σ3,σ4)=(σ '1,σ′2,σ3,σ4),
Whether first verify that hasSecondly verifying equationIt is whether true.If equation is set up,
Then signature passes through verifying, otherwise authentication failed.
If signature and randomization certificate that transaction sends user receive the trading card by verifying.Otherwise not to this friendship
Yi Dan is recorded.
As can be seen that the certificate after the randomization is still effectively to demonstrate,prove if user has carried out correct randomization to original certificate
Book.Because ifThen equationIt is equivalent toTo haveCertificate after being randomized still meets original
The validity of beginning certificate.
Step 3: being reached common understanding between miner based on POW common recognition mechanism and generate new block, and ultimately form block chain form
Trading card is recorded, transaction is completed.
In the POW common recognition mechanism of block chain, there are critical data items in data block --- random number N once.Miner passes through
It collects and verifies each and every one trading card to continuously attempt to find this random number, that is, digging mine=hash puzzles:H (Nonce | |
prev_block||tx||tx||...||tx)<Bits.In every 10 minutes, the miner only successfully dug to mine obtains primary book keeping operation
Right generates new block and synchronizes newly-increased account book information to other nodes.After 6 new blocks generate, original transaction is just identified
To complete.
As shown in figs. 3 and 6, after user identity tracing module 500 receives user identity tracking request, CA mechanism is transferred
Trace parameters when All Activity sends user's registration in certificate repository, and public key and relevant parameter pair after being randomized according to user
User identity is tracked.Specifically includes the following steps:
Step 1: after receiving user identity tracking request, CA mechanism transfers the All Activity in certificate repository and sends user's note
Trace parameters when volumeWhereinαiFor the private key cc of i-th of user；
Step 2:CA mechanism be randomized according to user after public key upk '=(g1,X1) and trace parameters listUser identity is tracked.CA mechanism verifies equation using trace parameters one by oneSome T if it existsiSo that equation is set up, then the TiCorresponding registration user is to chase after
The user of track.
As can be seen that CA mechanism certainly being capable of trace parameters flow table in certificate of utility libraryTrack corresponding user.Because
For a certain user i,As long as so having submitted tracking when user's registration
Parameter just can centainly be checked one by one according to above-mentioned equation by CA mechanism and be tracked.
The traceable digital cash transaction system based on block chain proposed according to embodiments of the present invention, it is existing by combining
Have the digital cash transaction system such as Public Key Infrastructure PKI architectural framework and bit coin so that system have it is good cross-platform
Characteristic enhances the scalability of system, and has ensured the anonymity and traceability of terminal device.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (9)
1. a kind of traceable digital cash transaction system based on block chain characterized by comprising
Certificate request module is given birth to respectively for creating the system parameter of digital cash transaction system, and according to the system parameter
At the public and private key of certificate authority and the public and private key of transaction sending node, and according to the life of the public and private key of the certificate authority
At trace parameters；
Certificate release module, for being signed according to the private key of the certificate authority to the public key of the transaction sending node
Name generates certificate, and the certificate and the trace parameters are added in certificate repository；
Certificate is randomized module, carries out signature verification to the certificate for the transaction sending node, and confirming the card
After book is effective, the transaction sending node is randomized the public key of the certificate and the terminal device, and will randomization
Certificate afterwards is sent to digital cash transaction modules；
Digital cash transaction modules initiate the transaction to transaction acceptance node for the transaction sending node, generate trading card,
Miner's node collects the trading card, and is reached common understanding between miner's node based on POW common recognition mechanism and generate new block,
Transaction is completed in the form of block chain；And
User identity tracing module, for obtaining the trace parameters from the certificate repository, and according to after randomization
The public key of terminal device is tracked to realize and be tracked to user identity the terminal device.
2. the traceable digital cash transaction system based on block chain according to claim 1, which is characterized in that described
The operation of certificate request module and certificate randomization module is completed by user terminal, the certificate release module and the user
The operation of Identity escrow module is completed by the certificate authority, and the operation of the digital cash transaction modules is by the transaction
Sending node, miner's node and the transaction acceptance node are completed.
3. the traceable digital cash transaction system based on block chain according to claim 1, which is characterized in that described
Trade the initiator that sending node is digital cash transaction, and the transaction acceptance node is the reception of digital cash transaction
Side.
4. the traceable digital cash transaction system based on block chain according to claim 1, which is characterized in that described
Certificate request module, is specifically used for:
The system parameter of the certificate authority and the transaction sending node is created in digital cash transaction system；
The certificate authority generates public private key pair using the corresponding system parameter of the certificate authority, saves private key,
Announce public key；And
The transaction sending node generates public private key pair using the corresponding system parameter of the transaction sending node, saves private key,
Public key and trace parameters are sent to the certificate authority.
5. the traceable digital cash transaction system based on block chain according to claim 1, which is characterized in that described
Certificate release module, is specifically used for:
The public key of the transaction sending node in the certificate request module is received, the certificate authority utilizes the card
The corresponding private key of book certification authority carries out signature to the public key of the transaction sending node and generates certificate, and the certificate is sent out
Give the transaction sending node；
The certificate authority registers the transaction sending node in certificate registration unit, and by the transaction
The certificate of sending node and the trace parameters are added in certificate repository.
6. the traceable digital cash transaction system based on block chain according to claim 1, which is characterized in that described
Certificate is randomized module, is specifically used for:
After the transaction sending node receives certificate, signature verification is carried out to the certificate；
The transaction sending node is randomized the certificate and public key that are verified；
It will be randomized the validity of certificate using zero-knowledge proof technology proof, and the certificate after the randomization is sent to number
Word moneytary operations module.
7. the traceable digital cash transaction system based on block chain according to claim 6, which is characterized in that
If the certification authentication that the transaction sending node receives passes through, the transaction sending node output 1 receives certificate；
If the certification authentication that the transaction sending node receives does not pass through, the transaction sending node output 0, and return to police
Information is accused to the certificate authority.
8. the traceable digital cash transaction system based on block chain according to claim 1, which is characterized in that described
Digital cash transaction modules, are specifically used for:
The transaction sending node generates the trading card comprising the randomization certificate of the transaction acceptance node, and is sent to
Miner's node；
After miner's node receives the trading card, to the certificate and trading card progress validity after the randomization
Verifying；
Reached common understanding between miner's node based on POW common recognition mechanism and generate new block, and to the friendship in the form of block chain
Yi Dan is recorded, and transaction is completed.
9. the traceable digital cash transaction system based on block chain according to claim 1, which is characterized in that described
User identity tracing module, is specifically used for:
After the certificate authority receives user identity tracking request, the certificate authority, which is transferred in certificate repository, to be owned
Trace parameters when terminal device is registered；
The certificate authority according to it is described randomization certificate after public key and relevant parameter user identity is tracked.
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