CN105790954A - Method and system for constructing electronic evidence - Google Patents
Method and system for constructing electronic evidence Download PDFInfo
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- CN105790954A CN105790954A CN201610118469.4A CN201610118469A CN105790954A CN 105790954 A CN105790954 A CN 105790954A CN 201610118469 A CN201610118469 A CN 201610118469A CN 105790954 A CN105790954 A CN 105790954A
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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
- H04L9/32—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
- H04L9/3297—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials involving time stamps, e.g. generation of time stamps
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Abstract
The invention relates to a method for constructing an electronic evidence. The method specifically comprises the following steps: generating a unique length-fixed digital abstract for electronic data of an applicant, and constructing a Merkle tree of an electronic evidence block chain system; constructing the electronic evidence block chain system with a timestamp; and setting an index number for a block by the electronic evidence block chain system, and returning the index number, the generated digital abstract and the timestamp to the applicant together. According to the method and the system disclosed by the invention, all participating parties can construct jointly, maintain jointly and supervise jointly, thereby meeting the right to know and the supervision right of each party; the identification cost of the electronic evidence is reduced, the identification efficiency is improved, and the objectivity and the reliability of the electronic evidence are enhanced.
Description
Technical field
The present invention relates to the electronic evidence building method on the Internet and system, particularly to a kind of method and system building electronic evidence based on block chain and timestamp.
Background technology
Having a class in electronic data is prove " outness of electronic data ", and as a kind of " objective reality ", this kind of electronic evidence needs effectively to prove the existence of " who ", " when " and " what content ".Along with people use the fast development of the Internet and information consumption, electronic evidence more and more by court's trial or conduct among the people be recognized evidence use.When needs do existence proof for certain electronic data, such as prove the original copyright ownership of certain music electronic version, the original copyright ownership etc. of certain monograph electronic edition, people to select believable mode prove who, when, done what behavior that perhaps there occurs in what.
The method and system building electronic evidence in prior art is by the single centre building system of country's relevant authentication agency qualification, it is not carried out right to know and the custodial right of related side, for Email, MSN chat record etc. frequently as electronic evidence, proved the feasibility of its existence by e-mail system operation side, instant messaging service side or judicial expertise mechanism etc., genuine, nothing are distorted.Therefore, there is following subject matter in prior art:
Because Email and chat record itself are also electronic data, its carrier is the essence of " electronization " medium (electronic chip, magnetizing mediums, light medium etc.) equally so that it is the safety problem in links such as establishment, storage, transmission proposes challenge all to its " objectivity ".
" single centre " online service mode of existing schemes is easily caused: if the network failure at single center, then application cannot be serviced；The finite capacity of single central site network, many applications cannot quickly be confirmed.
" single centre " scheme is difficult to take precautions against the risk of its (or its staff) " doing evil ", such as, when be in the time-stamping service mechanism of core status or instant messaging service organization because of its interests need arbitrarily to distort, forge, erasing time stamp time or chat record, the mechanism individual that other lay under tribute cannot find, more can not propose strong evidence.
This system is opaque, and the regulatory responsibility of government is also difficult to play due effect wherein.Even if there being regulation to require " trusted timestamp " is wanted remote backup, but being because it and be derived from unique mechanism, its credibility is also under suspicion unavoidably.Same because it is opaque, CA (certification authority) certificate of mechanism is likely to expired or is revoked, and user and regulator are difficult to find.Same situation is there is in Email with instant messaging.
Each electronic data is done the mode that trusted timestamp process is a kind of high cost and poor efficiency.
Summary of the invention
In view of deficiency of the prior art, it is proposed that the present invention, in order to provide a kind of a kind of electronic evidence construction method and system overcoming the problems referred to above or solving the problems referred to above at least in part.
The present invention provides the construction method of a kind of electronic evidence, specifically includes following steps:
The electronic data of applicant is generated digital digest unique, fixed length, and constructs the Merkel tree of electronic evidence block catenary system；
The electronic evidence block catenary system that structural belt stabs if having time；
Electronic evidence block catenary system is that block sets up call number, and the digital digest of this call number, generation is returned to applicant together with timestamp.
Further, the concrete grammar of the Merkel tree of described structure electronic evidence block catenary system includes:
Applicant submits the PKI of the cipher key pair of electronic data and rivest, shamir, adelman to the receiving terminal of block catenary system；
Electronic data is sent to digital digest maker by receiving terminal, and electronic data is generated digital digest unique, fixed length by digital digest maker, and the digital digest of fixed length is sent to block chain constructor；
Block chain constructor one record including digital digest and PKI of structure, and record is passed to communicator；
Record is diffused in network and participates in each side that block chain electronic evidence is built and safeguarded by communicator, and receives the record that other each side send, and the set of records ends of acquisition is sent jointly to block chain constructor by communicator in the interval period specified afterwards；
The set of records ends received is screened by block chain constructor, preserves a record after screening, then by Merkel tree rule construct Merkel tree on each leaf node.
Further, the electronic evidence block catenary system that described structural belt stabs if having time specifically includes:
Block chain constructor constructs the block of present interval period after obtaining a timestamp from timestamp maker application, the digital digest of the block that the content of the block of present interval period generates including at least Merkel tree, timestamp and previous interval period, and the content of this block is passed to common recognition device；
The block newly reached common understanding is passed to block chain constructor after reaching common understanding with other each side by communicator by common recognition device, and block chain constructor is saved in new block in storage device according to the logical structure of block chain.
Further, the electronic evidence block catenary system that described structural belt stabs if having time specifically includes:
Block chain constructor constructs the block of present interval period after obtaining a timestamp from timestamp maker application, the digital digest of the block that the content of the block of present interval period generates including at least Merkel tree, timestamp and previous interval period, and this block content is passed to common recognition device；
The block content received is passed to digital digest maker by common recognition device, obtains the digital digest of the block of present interval period, and this digital digest is appended in current block；
The block newly reached common understanding is passed to block chain constructor after reaching common understanding with other each side by communicator by common recognition device, and block chain constructor is saved in new block in storage device according to the logical structure of block chain.
Further, described method also includes: electronic evidence block catenary system is by the interval specified or block counts interval, by the publicity of the content selective of up-to-date block to public media.
Further, described method also includes: the step that electronic data is verified, particularly as follows:
Checking applicant specifies according to system and requires to provide identification check data；
System is according to identification check data-searching this block record received；
The timestamp of electronic data is verified by system；
The first registration people of electronic evidence is carried out authentication by system；
The above-mentioned result being verified is added that the digital signature of native system returns to checking applicant together by system.
Further, call number that described identification check data includes obtaining after structure specifies PKI corresponding to electronic evidence, structure electronic evidence, timestamp, digital digest, if checking applicant does not apply for that original electron Data Hosting services, the complete content of original electron data also should be included.
According to a further aspect in the invention, it is provided that the constructing system of a kind of electronic evidence, including:
Receiving terminal, for receiving electronic data and the PKI that applicant submits to, and is sent to digital digest maker by this electronic data；
Digital digest maker, for the electronic data to the random length received, the digital digest of output fixed length；
Timestamp maker, generates the time alternately for form according to the rules；
Communicator: for form according to the rules and each side's communication participating in the construction of block chain, safeguard, mutually transmit information；
Common recognition device: for the digital digest set being about to write block chain is reached an agreement, so that the content that participation each side is each independently written block chain is identical；
Block chain constructor: construct block chain write storage device for the logical structure according to block chain, and according to the block chain information in the rule search storage device specified；
Further, the constructing system of described a kind of electronic evidence also includes publicity device, for according to the time specified or block counts interval, the public notification of information in electronic evidence block chain to public media, and interacts for public media and block chain.
A kind of electronic evidence construction method of present invention proposition and system, participation each side can being made jointly to build, jointly safeguard, jointly supervise, thus meeting the right to know of each side, authority to supervise, reducing the appraisal cost of electronic evidence, improve determination rates, strengthen objectivity and the credibility of electronic evidence.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, below the accompanying drawing used required during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the schematic flow sheet of the construction method of a kind of electronic evidence of the embodiment of the present invention.
Fig. 2 is the logical schematic of the electronic evidence block chain of the embodiment of the present invention.
Fig. 3 is the structural representation of the constructing system of a kind of electronic evidence of the embodiment of the present invention.
Detailed description of the invention
Describe in more detail the exemplary embodiment of the present invention below with reference to accompanying drawings.Although accompanying drawing shows the exemplary embodiment of the present invention, it being understood, however, that may be realized in various forms the present invention, and should do not limited by embodiments set forth here.On the contrary, it is provided that these embodiments are to enable the more thorough explanation present invention, and complete for the scope of the present invention can be conveyed to those skilled in the art.
The electronic evidence construction method of the present invention and constructing system are based on block chain and timestamp technology realizes,
In block chain in the content of each " block (block) " of storage, except including the Merkel tree (Merkletree that this Block Record Set (TXs) is constituted, i.e. Merkel's Hash tree MerkelHashTree) outward, further comprises the cryptographic Hash of previous piece of content (Pre-H), be the equal of the logical pointer pointing to previous logical block, the last affix cryptographic Hash H(i.e. cryptographic Hash H of this block to content).The cryptographic Hash H of this block also can be stored in this block content as the cryptographic Hash Pre-H of previous piece of content, the cryptographic Hash H of this block also can be stored in next new block content.This is the process of a kind of forward direction endorsement, and namely the strengthening further that produces of new block has locked the content of had been friends in the past block.So constructed by the mode of cryptographic verifications ensure sequential, can not forge, can not distort, irrevocable chain (Chain).
Block chain has multicenter, collaborative, transparent application characteristic, and sequential ensures, can not forge, can not distort, the technical characteristic of unsuppressible-suppression (or cost is extremely expensive), the present invention is in the building process of electronic evidence, use block chain combination timestamp technology, the effect in many ways playing common construction, common maintenance, common supervision of participation can be made in electronic evidence field, reduce the appraisal cost of electronic evidence, improve determination rates, better play the due effect of electronic evidence.
As it is shown in figure 1, according to an aspect of the present invention, it is provided that the construction method of a kind of electronic evidence, specifically include following steps:
Step S10, generates digital digest unique, fixed length to the electronic data of applicant, and constructs the Merkel tree of electronic evidence block catenary system.Concrete grammar includes:
Step S101, applicant submits the PKI of the cipher key pair of electronic data and rivest, shamir, adelman to the receiving terminal of block catenary system.
The applicant of electronic evidence can adopt rivest, shamir, adelman to generate pair of secret keys, i.e. PKI PUB-K and private key PRI-K, this kind of rivest, shamir, adelman has a variety of, such as ECDSA (ECDSA), key private key therein is exactly the identity of applicant, may be used for the ownership of subsequent authentication applicant, because the characteristic of unsymmetrical key system, it is considered herein that the people holding private key PRI-K corresponding for certain PKI PUB-K, represent that it is exactly the first registration people of PUB-K correspondence evidence.Applicant submits electronic data Data and PKI PUB-K to the receiving terminal of block catenary system.
Step S102, electronic data is sent to digital digest maker by receiving terminal, and electronic data is generated digital digest unique, fixed length by digital digest maker, and the digital digest of fixed length is sent to block chain constructor.
After the receiving terminal of electronic evidence block catenary system receives electronic data and the PKI of applicant's submission, this electronic data is sent to digital digest maker, and the electronic data Data complete, random length received is converted to the digital digest Hr of fixed length by digital digest maker.
Alternatively; needs for protection privacy; digital digest maker may be mounted in personal computer or the mobile client of applicant; applicant oneself utilizes digital digest maker that electronic data generates digital digest Hr; after generating digital digest Hr, only digital digest Hr is sent to block chain constructor by network.So, original electron data itself only by applicant oneself keeping, so more can protect privacy.Certainly, for the reliability preserved, applicant can also entrust the electronic evidence block catenary system of the present invention to preserve simultaneously.
Further, as option, applicant can also be uploaded to system the digital signature of oneself, and the method for structure digital signature is as input using digital digest Hr and private key PRI-K, adopts ECDSA to calculate digital signature.
Step S103, block chain constructor one record including digital digest and PKI of structure, and record is passed to communicator.
Block chain constructor constructs a record R, and its content includes digital digest Hr and PKI PUB-K, is bound by digital digest Hr and PKI PUB-K, and namely reference numerals summary Hr is owned by PKI PUB-K, the corresponding unique PKI PUB-K of unique digital digest Hr.
Step S104, record is diffused in network and participates in each side that block chain electronic evidence is built and safeguarded by communicator, and receives the record that other each side send, and the set of records ends of acquisition is sent jointly to block chain constructor by communicator in the interval period specified afterwards.
Record R is diffused in network and participates in each side that block chain electronic evidence is built and safeguarded by communicator, and receives the record R that other each side send.It is equality that block chain constructs each side, and time current block sends record R, other each side are also sending their respective record R, and such a interval period had just collected a set of records ends Rs.Set of records ends Rs is sent jointly to block chain constructor by communicator in the interval period specified afterwards.Interval sets, such as 1 minute according to service needed, or 30 seconds etc..
Step S105, the set of records ends received is screened by block chain constructor, preserves a record after screening, then by Merkel tree rule construct Merkel tree on each leaf node.
Set of records ends Rs is screened, according to service needed, the effectiveness distinguishing wherein content by block chain constructor, and such as whether digital digest Hr has existed for, and constructs these set of records ends Rs Merkel tree MT constituted.
Step S20, the electronic evidence block catenary system that structural belt stabs if having time.Concrete grammar includes:
Step S201, block chain constructor constructs the block of present interval period after obtaining a timestamp from timestamp maker application, when the digital digest of the block that the main contents of the front block of interval period generate including at least Merkel tree, timestamp and previous interval period, and this block content is passed to common recognition device.
Block chain constructor obtains a time stamp T S from timestamp maker application, the block of structure present interval period, that assumes the block currently done is numbered T, and set the main contents of current block T as C, so including at least the block (numbering: digital digest H(T-1 T-1)), and current block main contents C is passed to common recognition device of Merkel tree MT, time stamp T S and previous interval period in main contents C.
In the present invention, " block of present interval period " is exactly " current block ", but simply construct at certain participant." new block " is after each participant is reached common understanding, " current block " conduct " new block " of one of them selected participant
Step S202, this step is as a kind of optional step, and the block content received is passed to digital digest maker by common recognition device, obtains the digital digest of current block, digital digest is appended in current block.
Block content C is passed to digital digest maker by common recognition device, obtains the digital digest H (T) of current block, digital digest H (T) is appended in block content C.
Step S203, the block newly reached common understanding is passed to block chain constructor after reaching common understanding with other each side by communicator by common recognition device, and block chain constructor is saved in new block in storage device according to the logical structure of block chain.
The logical structure schematic diagram of block chain as in figure 2 it is shown, trapezoidal is the non-leaf nodes (intermediate node) of Merkel tree, the wherein digital digest value after its downstream site in store (can be 1,2 and multiple) content combination.(most downstream site) saves in record R, the R of reality and has at least the digital digest Hr of R and the PKI PUB-K of applicant as it can be seen, the leaf node of Merkel tree.
Wherein, the method reached common understanding has multiple, the inter-agency common recognition of such as different authentication reaches the PoW (ProofofWork that can use maturation, proof of work), PoS (ProofofStake, rights and interests prove), the mode such as RPCA (RippleConsensusAlgorithm, consistency algorithm).Storage device can be hard disk and disk etc., and for the needs of evidence integrality, applicant can select original electron data Data by system trusteeship service.
Step S30, electronic evidence block catenary system is new block and call number set up in record, and the digital digest of this call number, generation is returned to applicant together with timestamp.
Block chain constructor is that new block B and record R sets up call number Bi, call number Bi to include block number T, and the digital digest Hr and time stamp T S of this call number Bi, applicant's electronic data are returned to applicant.
As the further improvement of a upper embodiment, the construction method of a kind of electronic evidence, its step also includes: electronic evidence block catenary system is by the interval specified or block counts interval, by the publicity of the content selective of up-to-date for this time point block to public media.Such as, publicity device is according to the interval specified, in the content of the up-to-date block reached common understanding, at least the publicity such as call number Bi, time stamp T S and digital digest H (T) is to public media, public media includes newspaper, website, microblogging, trusted timestamp service organization (such as the TSA of China) etc..
By above-described embodiment it can be seen that, complete electronic evidence obtains complete storage in block chain, and block catenary system saves source or the PKI PUK-K of whose PUK-K(and applicant oneself represents the source of electronic evidence), the digital digest Hr and this electronic evidence build time TS of the uniqueness of electronic data.
As the further improvement of a upper embodiment, the construction method of a kind of electronic evidence, its step also includes: the step S40 that electronic data is verified, and is substantially completed by the block chain constructor of system, concrete:
Step S401, checking applicant specifies according to system and requires to provide identification check data.
Checking applicant specifies according to system and requires to provide identification check data.Such as, checking applicant should provide in its call number Bi, time stamp T S obtained after constructing PKI PUB-K corresponding to appointment electronic evidence, structure electronic evidence and digital digest Hb(and preceding step to system and mention Hr, but this place is applicant oneself to be provided, therefore the Hr that not necessarily makes a summary with original figure is identical, adopts Hb mark to distinguish herein)；If checking applicant does not apply for that original electron Data Hosting services, system may also require that checking applicant submits the complete content Dt of original electron data Data to.
Step S402, system is according to identification check data-searching this block record received.
Specific this block record TX of identification check data-searching that the block chain constructor of system provides according to checking applicant, if retrieval less than; checking does not pass through.
If registration people had applied for that original electron Data Hosting serviced originally, system is except retrieval record R, also to retrieve the complete content Dt of original electron data and the integrity of its content is verified: electronic data complete content Dt is input to digital digest maker by system, obtaining the digital digest Ht of output；By digital digest Ht and former digital digest Hr contrast, if consistent, representing that complete content Dt is the original complete electronic data of electronic evidence, otherwise checking does not pass through.
Step S403, the timestamp of electronic data is verified by system.
System is according to block corresponding with time stamp T S for applicant identification check source index Bi, and whether the timestamp that contrast retrieves is consistent with the time stamp T S of checking applicant, logs off if inconsistent, and checking does not pass through.
The block number of public media is arrived, then system prepares publicity information (details of public media) to return to applicant if call number Bi is publicity；If call number Bi is not by the block number of publicity to public media, then nearest by the block of publicity before and after retrieval Bi respectively, prepare the publicity information (details of public media) of two blocks retrieved to prepare to return to applicant.
Step S404, the first registration people of electronic evidence is carried out authentication by system.
The step of first registration people (i.e. the holder of the PRI-K) authentication of system verification electronic evidence is as follows: system generates a random number rams, and system, rams, returns to applicant；Require that rams is digitally signed by the PRI-K using first registration people corresponding and obtain sig, and sig is submitted to again system；With PUB-K, system verifies that rams and sig(is by digital signature rule), represent that applicant is everyone of this record R if the verification passes, otherwise checking does not pass through.
Step S405, above-mentioned the result is added that the digital signature of native system returns to checking applicant together by system.
Further improvement as above-mentioned verification method, checking applicant can participate in the system of mechanism in the appointment difference in mechanism that participates in participating in building electronic evidence block catenary system, and repeat the above steps, with contrast verification result, under normal conditions, the result should be identical.
By above-described embodiment it can be seen that technical scheme is based on block chain and timestamp technological means, build " the multicenter system architecture " that in many ways participate in, electronic evidence information is write in block chain, and announce to the public in good time.Participate in each side jointly to build, jointly safeguard, jointly supervise, thus meeting the right to know of each side, authority to supervise, reducing the appraisal cost of electronic evidence, improving determination rates, strengthen objectivity and the credibility of electronic evidence.Gather around and have the advantage that:
(1) participate in each side and can preserve complete or part block chain at respective memory space, be equivalent to each other serve redundancy backup effect.The information in block chain that is stored in is transparent shared to participating in each side, and everybody supervises jointly.
(2) before information is written to the block chain of respective memory space, each side is reached an agreement by technology channel, it is ensured that write information is consistent, and can not forge, can not distort, non-repudiation, unsuppressible-suppression.
(3) participating in each side and " jointly safeguarded " objectivity of electronic evidence chain, once there be people to do evil (forge, distort, deny or delete), being also quickly easy to be found；Enhance the credibility of electronic evidence therein, and can effectively reduce evidence appraisal cost, improve evidence determination rates.
(4) electronic data " set " is done trusted timestamp in the way of interval process, improve efficiency, reduce cost, and can guarantee that moment and sequential.
As it is shown on figure 3, according to a further aspect in the invention, it is provided that the constructing system of a kind of electronic evidence, its principle is identical with the construction method of electronic evidence, does not repeat them here.Constructing system includes such as lower component:
Receiving terminal 31, for receiving electronic data and the PKI that applicant submits to, and is sent to digital digest maker 32 by this electronic data.
Digital digest maker 32, for the electronic data to the random length received, the digital digest of output fixed length.The inside of digital digest maker 32 can adopt multiple hash algorithm, by the hash algorithm output digital digest specified, for instance SHA256 algorithm, RIPEMD160 algorithm etc..
Timestamp maker 33, generates the time alternately for form according to the rules.The time generated can be absolute time, for instance during the X X X month, X day, X divides the X second；Can also be relative time, namely apart from the number of seconds of a certain reference time or ticking number, number of seconds so far or ticking number time such as from 1 day zero January in 1970.
Communicator 34: for form according to the rules and each side's communication participating in the construction of block chain, safeguard, mutually transmit information.
Common recognition device 35: for the digital digest set being about to write block chain is reached an agreement, so that the content that participation each side is each independently written block chain is identical.
Block chain constructor 36: construct block chain write storage device for the logical structure according to block chain, and according to the block chain information in the rule search storage device specified.Storage device can be hard disk or disk etc..
Further improvement as above-described embodiment, a kind of system building electronic evidence, publicity device 37 can also be included, publicity device 37 is for according to the interval specified or block counts interval, the public notification of information in electronic evidence block chain to public media, and interact for public media and block chain, such as inquiry particular block information, checking publisher's identity information etc., such public media can verify the true and false of block publisher and block.Public media can be newspaper, website, microblogging, service organization trusty (such as the TSA of China) etc..Certainly, publicity device 17 allows also to retrieve the information of publicity according to specified rule.
According to a kind of system building electronic evidence of the present invention, one complete electronic evidence is identified by electronic data and evidence and forms, evidence mark is made up of the source side of evidence or the possessor of electronic data, the digital digest of uniqueness and this electronic evidence build time again, wherein, the digital digest of uniqueness is to be generated by the digital digest maker of the present invention, and this electronic evidence build time is to be generated by the timestamp maker of the present invention.Each participant of block chain building independently disposes above complete, identical system according to the above embodiment of the present invention, builds complete identical electronic evidence block chain the most at last.
Participate in electronic evidence appraisal organization, country punctual time service mechanism (or being authorized to manage the enterprise of time-stamping service), government monitoring agencies, mechanism of public security organs, legal industry association (alliance) etc. that the mechanism of electronic evidence block chain building can authorize；Even at some nonlegal compulsory field can have enterprise among the people and general public participate in building (namely electronic evidence block chain can have a plurality of, have operated by official bodies also have non-governmental).
As seen through the above description of the embodiments, those skilled in the art is it can be understood that can add the mode of required general hardware platform by software to the present invention and realize.Based on such understanding, the part that prior art is contributed by technical scheme substantially in other words can embody with the form of software product, this computer software product can be stored in storage medium, such as ROM/RAM, magnetic disc, CD etc., including some instructions with so that a computer equipment (can be personal computer, server, or the network equipment etc.) perform the method described in some part of each embodiment of the present invention or embodiment.
Each embodiment in this specification all adopts the mode gone forward one by one to describe, between each embodiment identical similar part mutually referring to, what each embodiment stressed is the difference with other embodiments.Especially for device or system embodiment, owing to it is substantially similar to embodiment of the method, so describing fairly simple, relevant part illustrates referring to the part of embodiment of the method.Apparatus and system embodiment described above is merely schematic, the wherein said unit illustrated as separating component can be or may not be physically separate, the parts shown as unit can be or may not be physical location, namely may be located at a place, or can also be distributed on multiple NE.Some or all of module therein can be selected according to the actual needs to realize the purpose of the present embodiment scheme.Those of ordinary skill in the art, when not paying creative work, are namely appreciated that and implement.
It should be understood that
Not intrinsic to any certain computer, virtual system or miscellaneous equipment relevant in algorithm and the display of this offer.Various general-purpose systems can also with use based on together with this teaching.As described above, the structure constructed required by this kind of system is apparent from.Additionally, the present invention is also not for any specific programming language.It is understood that, it is possible to utilize various programming language to realize invention described herein content.
Those skilled in the art are appreciated that, it is possible to module each in embodiment carries out changing and they being arranged in one or more equipment different from this embodiment of adaptivity.Unless otherwise being expressly recited, each feature disclosed in this specification can be replaced by the alternative features providing purpose identical, equivalent or similar.
The all parts embodiment of the present invention can realize with hardware, or realizes with the software module run on one or more processor, or realizes with their combination.
The foregoing is only the preferred embodiments of the invention, be not limited to the claims of the present invention.Simultaneously described above, for those skilled in the technology concerned it would be appreciated that and implement, therefore other equivalent changes completed based on disclosed content, should be included in the covering scope of present claims book.
Claims (9)
1. a construction method for electronic evidence, specifically includes following steps:
The electronic data of applicant is generated digital digest unique, fixed length, and constructs the Merkel tree of electronic evidence block catenary system；
The electronic evidence block catenary system that structural belt stabs if having time；
Electronic evidence block catenary system is that block sets up call number, and the digital digest of this call number, generation is returned to applicant together with timestamp.
2. the construction method of a kind of electronic evidence according to claim 1, it is characterised in that the concrete grammar of the Merkel tree of described structure electronic evidence block catenary system includes:
Applicant submits the PKI of the cipher key pair of electronic data and rivest, shamir, adelman to the receiving terminal of block catenary system；
Electronic data is sent to digital digest maker by receiving terminal, and electronic data is generated digital digest unique, fixed length by digital digest maker, and the digital digest of fixed length is sent to block chain constructor；
Block chain constructor one record including digital digest and PKI of structure, and record is passed to communicator；
Record is diffused in network and participates in each side that block chain electronic evidence is built and safeguarded by communicator, and receives the record that other each side send, and the set of records ends of acquisition is sent jointly to block chain constructor by communicator in the interval period specified afterwards；
The set of records ends received is screened by block chain constructor, preserves a record after screening, then by Merkel tree rule construct Merkel tree on each leaf node.
3. the construction method of a kind of electronic evidence according to claim 1, it is characterised in that the electronic evidence block catenary system that described structural belt stabs if having time specifically includes:
Block chain constructor constructs the block of present interval period after obtaining a timestamp from timestamp maker application, the digital digest of the block that the content of the block of present interval period generates including at least Merkel tree, timestamp and previous interval period, and the content of this block is passed to common recognition device；
The block newly reached common understanding is passed to block chain constructor after reaching common understanding with other each side by communicator by common recognition device, and block chain constructor is saved in new block in storage device according to the logical structure of block chain.
4. the construction method of a kind of electronic evidence according to claim 1, it is characterised in that the electronic evidence block catenary system that described structural belt stabs if having time specifically includes:
Block chain constructor constructs the block of present interval period after obtaining a timestamp from timestamp maker application, the digital digest of the block that the content of the block of present interval period generates including at least Merkel tree, timestamp and previous interval period, and this block content is passed to common recognition device；
The block content received is passed to digital digest maker by common recognition device, obtains the digital digest of the block of present interval period, and this digital digest is appended in current block；
The block newly reached common understanding is passed to block chain constructor after reaching common understanding with other each side by communicator by common recognition device, and block chain constructor is saved in new block in storage device according to the logical structure of block chain.
5. the construction method of a kind of electronic evidence according to claim 1, it is characterised in that described method also includes: electronic evidence block catenary system is by the interval specified or block counts interval, by the publicity of the content selective of up-to-date block to public media.
6. the construction method of a kind of electronic evidence according to claim 1, it is characterised in that described method also includes: the step that electronic data is verified, particularly as follows:
Checking applicant specifies according to system and requires to provide identification check data；
System is according to identification check data-searching this block record received；
The timestamp of electronic data is verified by system；
The first registration people of electronic evidence is carried out authentication by system；
The above-mentioned result being verified is added that the digital signature of native system returns to checking applicant together by system.
7. the construction method of a kind of electronic evidence according to claim 6, it is characterized in that, call number that described identification check data includes obtaining after structure specifies PKI corresponding to electronic evidence, structure electronic evidence, timestamp, digital digest, if checking applicant does not apply for that original electron Data Hosting services, the complete content of original electron data also should be included.
8. a constructing system for electronic evidence, including:
Receiving terminal, for receiving electronic data and the PKI that applicant submits to, and is sent to digital digest maker by this electronic data；
Digital digest maker, for the electronic data to the random length received, the digital digest of output fixed length；
Timestamp maker, generates the time alternately for form according to the rules；
Communicator: for form according to the rules and each side's communication participating in the construction of block chain, safeguard, mutually transmit information；
Common recognition device: for the digital digest set being about to write block chain is reached an agreement, so that the content that participation each side is each independently written block chain is identical；
Block chain constructor: construct block chain write storage device for the logical structure according to block chain, and according to the block chain information in the rule search storage device specified.
9. the constructing system of a kind of electronic evidence according to claim 8, it is characterized in that, described system also includes publicity device, for according to the time specified or block counts interval, the public notification of information in electronic evidence block chain to public media, and interact for public media and block chain.
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