CN106485168A - A kind of method whether being modified using MD5 value checking contract documents - Google Patents
A kind of method whether being modified using MD5 value checking contract documents Download PDFInfo
- Publication number
- CN106485168A CN106485168A CN201610901310.XA CN201610901310A CN106485168A CN 106485168 A CN106485168 A CN 106485168A CN 201610901310 A CN201610901310 A CN 201610901310A CN 106485168 A CN106485168 A CN 106485168A
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- contract
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/60—Protecting data
- G06F21/64—Protecting data integrity, e.g. using checksums, certificates or signatures
-
- 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
- H04L9/3236—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 using cryptographic hash functions
- H04L9/3239—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 using cryptographic hash functions involving non-keyed hash functions, e.g. modification detection codes [MDCs], MD5, SHA or RIPEMD
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- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Theoretical Computer Science (AREA)
- General Health & Medical Sciences (AREA)
- Health & Medical Sciences (AREA)
- Bioethics (AREA)
- Signal Processing (AREA)
- Computer Hardware Design (AREA)
- Software Systems (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Storage Device Security (AREA)
- Management, Administration, Business Operations System, And Electronic Commerce (AREA)
Abstract
The invention discloses a kind of verify, using MD5 value, the method whether contract documents is modified, comprise the following steps：Generate the MD5 value of contract documents；Confirmed with private key signature by Party A, then confirmed by Party B's private key signature；The MD5 value of contract documents and signing messages are integrated into a complete information, and store in block chain；Inquire the corresponding record in block chain, obtain MD5 value and signing messages；Party A carries out public key verifications signature, if checking is not passed through, avoidance of contract；Or Party B carries out public key verifications signature, if checking is not passed through, avoidance of contract；If both sides' checking is all passed through, contract documents is generated again MD5 value, and contrasted with the MD5 value of storage in block chain, if contrast is equal, effectively, if checking is unequal, contract is invalid for contract.Using the inventive method, after electron contract, if there being one party that promise breaking and situation about recognizing of being unwilling, the effectiveness of the provable electronic contract of the method occur.
Description
Technical field
The present invention relates to MD5 value application, verify what whether contract documents was modified particularly to a kind of using MD5 value
Method.
Background technology
Electronic contract is easily tampered or forges, when contract dispute it is impossible to provide strong evidence that
The verity of contract.In solving the problems, such as contract verity, need to solve Railway Project：1) whether file is tampered：To whole
Individual file generated MD5 value, once after MD5 value generates, there is any modification in file, MD5 value all will change, by this side
Method can determine whether file is tampered with.2) verity storing：Using the storage of block chain, because the disclosure of block chain and not
The characteristic that can distort, information is existed in block chain will be by persistence, and it is impossible to realize block under existing technology
Distorting it is possible to determine that once information is stored entrance block chain of chain, will not be deleted and change, verity can obtain
To guarantee.3) how to determine that both sides' all adoption of contracts are effective：Using key signature, confirm that signature and contract are just raw through both sides
Effect；The verity of private key signature can be confirmed when having objection by public key verifications.
Electronic document trusted timestamp, provides one by third party's time-stamping service center for e-file and can prove that electronics
File content integrity and add a cover timestamp time an electronic certificate.Trusted timestamp is to be taken by authoritative trusted timestamp
Sign and issue one of business center can prove that electronic message (e-file) is having existed, complete, can test in a time point
Card, possess the electronic certificate of act of law, trusted timestamp is mainly used in e-file anti-tamper and deny afterwards, determines electric
The correct time that subfile produces.Existing technology needs to complete by believable time-stamping service mechanism, and convenience is
Shortcoming, and due to being the service that the third-party institution provides, there is certain hidden danger in terms of safety.
Relational language
Block chain：The data base of distributed decentration, has the characteristics that to change and delete.
Signature key：A pair of secret keys, is divided into private key and public key, and for signing and verifying, user uses private key signature, public key
Checking, that is, with after private key signature, verifying with public key whether this signature is that this private key is signed.
Signature：By a kind of identity of private key signature.
File MD5 value：Draw the MD5 value of file by file is encrypted with algorithm, this value is made any in file
All can change after modification.
Content of the invention
The technical problem to be solved be provide a kind of using MD5 value checking contract (or contract) file whether by
, after electron contract, promise breaking and situation about recognizing of being unwilling if there are one party, the method can be demonstrate,proved in the method for modification
The effectiveness of bright electronic contract.
For solving above-mentioned technical problem, the technical solution used in the present invention is：
A kind of method whether being modified using MD5 value checking contract documents, is comprised the following steps：
Step 1：Generate the MD5 value of contract documents；
Step 2：By Party A with private key signature confirm, then through Party B confirm errorless after confirmed with private key signature；
Step 3：The MD5 value of contract documents and signing messages are integrated into a complete information, and store block
In chain, preserve the Record ID returning in block chain；
Step 4：Inquire the corresponding record in block chain, obtain MD5 value and signing messages；
Step 5：Party A carries out public key verifications signature, if checking is not passed through, avoidance of contract；Or Party B carries out public key verifications
Signature, if checking is not passed through, avoidance of contract；
Step 6：If both sides checking all pass through, contract documents is generated MD5 value again, and with block chain in storage
MD5 value contrasted, if contrast is equal, contract effectively, if verifying unequal, avoidance of contract.
Compared with prior art, the invention has the beneficial effects as follows：Using the inventive method, after electron contract, such as
Fruit has one party promise breaking and situation about recognizing of being unwilling, the effectiveness of the provable electronic contract of the method.
Brief description
Fig. 1 is a kind of signing process of the method whether being modified using MD5 value checking contract documents of the present invention.
Fig. 2 is a kind of proof procedure of the method whether being modified using MD5 value checking contract documents of the present invention.
Specific embodiment
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description.The invention mainly comprises closing
With signing and storage：During digital contract signing, concluding parties determine treaty content and write file, then give birth to file
Become MD5 value, first confirmed with private key signature by Party A, then through Party B confirm errorless after with private key signature confirmation, now will be through both sides
One file MD5 value of signature is stored in block chain persistence, and contract documents then needs to protect on special file server
Deposit.Contract verification：When both sides need the verity of contract is verified it is only necessary to the record being stored into block chain is found
Come, both sides carry out signature verification with public key, and contract documents is generated again in MD5 value, with block chain very little MD5 value carry out right
Than, if signature verification passes through and two MD5 values are equal, illustrate that contract documents does not truly occur any modification to play tricks,
And confirm through both sides.
Details are as follows, comprises the following steps：
Step 1：Generate the MD5 value of contract documents；
Step 2：By Party A with private key signature confirm, then through Party B confirm errorless after confirmed with private key signature；
Step 3：The MD5 value of contract documents and signing messages are integrated into a complete information, and store block
In chain, preserve the Record ID returning in block chain；
Step 4：Inquire the corresponding record in block chain, obtain MD5 value and signing messages；
Step 5：Party A carries out public key verifications signature, if checking is not passed through, avoidance of contract；Or Party B carries out public key verifications
Signature, if checking is not passed through, avoidance of contract；
Step 6：If both sides checking all pass through, contract documents is generated MD5 value again, and with block chain in storage
MD5 value contrasted, if contrast is equal, contract effectively, if verifying unequal, avoidance of contract.
In the present invention, after electron contract, if there are one party, promise breaking and situation about recognizing of being unwilling, the method occur
The effectiveness of provable electronic contract.For example, both sides have signed the contract of online loaning bill, pass through to sign when signing a contract
Name saves file MD5 value to block chain, and then Party B is reluctant to recognize that oneself having signed contract refusal refunds, now Zhi Xudao area
Find the MD5 value of storage in block chain, carry out the checking with MD5 value of signing, if the verification passes, then explanation both sides sign really
Order contract.
Claims (1)
1. a kind of method whether being modified using MD5 value checking contract documents is it is characterised in that comprise the following steps：
Step 1：Generate the MD5 value of contract documents；
Step 2：By Party A with private key signature confirm, then through Party B confirm errorless after confirmed with private key signature；
Step 3：The MD5 value of contract documents and signing messages are integrated into a complete information, and store in block chain,
Preserve the Record ID returning in block chain；
Step 4：Inquire the corresponding record in block chain, obtain MD5 value and signing messages；
Step 5：Party A carries out public key verifications signature, if checking is not passed through, avoidance of contract；Or Party B carries out public key verifications label
Name, if checking is not passed through, avoidance of contract；
Step 6：If both sides' checking is all passed through, contract documents is generated again MD5 value, and with block chain in store
MD5 value is contrasted, if contrast is equal, effectively, if checking is unequal, contract is invalid for contract.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610901310.XA CN106485168A (en) | 2016-10-17 | 2016-10-17 | A kind of method whether being modified using MD5 value checking contract documents |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610901310.XA CN106485168A (en) | 2016-10-17 | 2016-10-17 | A kind of method whether being modified using MD5 value checking contract documents |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106485168A true CN106485168A (en) | 2017-03-08 |
Family
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610901310.XA Pending CN106485168A (en) | 2016-10-17 | 2016-10-17 | A kind of method whether being modified using MD5 value checking contract documents |
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107769922A (en) * | 2017-10-31 | 2018-03-06 | 捷德（中国）信息科技有限公司 | Block chain safety management system and method |
| CN108471510A (en) * | 2018-01-29 | 2018-08-31 | 东莞理工学院 | A kind of vision operation record protection method and system based on block chain |
| CN108540488A (en) * | 2018-04-25 | 2018-09-14 | 济南浪潮高新科技投资发展有限公司 | A kind of digital signature judicial expertise system and method based on block chain |
| WO2018201797A1 (en) * | 2017-05-03 | 2018-11-08 | 上海点融信息科技有限责任公司 | Block chain-based distributed storage |
| CN109145275A (en) * | 2018-08-07 | 2019-01-04 | 广东工业大学 | A kind of block chain electronic contract management and intelligent generating system and method |
| CN109491981A (en) * | 2019-01-11 | 2019-03-19 | 珮金(上海)信息科技有限公司 | File management method and device based on block chain |
| CN110309259A (en) * | 2018-10-10 | 2019-10-08 | 腾讯科技（深圳）有限公司 | Audit result data storage, querying method, audit item storage method and device |
| CN110351239A (en) * | 2019-05-24 | 2019-10-18 | 平安普惠企业管理有限公司 | It is a kind of based on the electronic contract storage method and device of block chain, electronic equipment |
| CN110362969A (en) * | 2018-06-12 | 2019-10-22 | 腾讯科技（深圳）有限公司 | A kind of resource rights check method, apparatus and equipment |
| CN110826092A (en) * | 2018-08-14 | 2020-02-21 | 珠海金山办公软件有限公司 | File signature processing system |
| CN110826091A (en) * | 2018-08-14 | 2020-02-21 | 珠海金山办公软件有限公司 | File signature method and device, electronic equipment and readable storage medium |
| CN110830256A (en) * | 2018-08-14 | 2020-02-21 | 珠海金山办公软件有限公司 | File signature method and device, electronic equipment and readable storage medium |
| CN111224788A (en) * | 2020-04-21 | 2020-06-02 | 国网区块链科技(北京)有限公司 | Electronic contract management method, device and system based on block chain |
| CN111431725A (en) * | 2020-04-12 | 2020-07-17 | 中信银行股份有限公司 | Method for signing, changing and verifying validity of electronic agreement in bank system, electronic agreement management system and readable storage medium |
| CN111756543A (en) * | 2019-03-29 | 2020-10-09 | 区块科技股份有限公司 | Contract signing and verifying system based on block chain and implementation method thereof |
| WO2021017350A1 (en) * | 2019-07-26 | 2021-02-04 | 深圳壹账通智能科技有限公司 | Bidding document management method and system, and computer readable storage medium |
| CN112615719A (en) * | 2020-12-15 | 2021-04-06 | 平安消费金融有限公司 | Decentralized online contract signing method, device, equipment and medium |
| CN115664852A (en) * | 2022-12-14 | 2023-01-31 | 金钱猫科技股份有限公司 | Data management method and system based on block chain technology |
| WO2023035477A1 (en) * | 2021-09-10 | 2023-03-16 | 马治国 | Blockchain-based method for document validation |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018201797A1 (en) * | 2017-05-03 | 2018-11-08 | 上海点融信息科技有限责任公司 | Block chain-based distributed storage |
| CN107769922A (en) * | 2017-10-31 | 2018-03-06 | 捷德（中国）信息科技有限公司 | Block chain safety management system and method |
| CN108471510A (en) * | 2018-01-29 | 2018-08-31 | 东莞理工学院 | A kind of vision operation record protection method and system based on block chain |
| CN108540488A (en) * | 2018-04-25 | 2018-09-14 | 济南浪潮高新科技投资发展有限公司 | A kind of digital signature judicial expertise system and method based on block chain |
| CN108540488B (en) * | 2018-04-25 | 2020-08-21 | 浪潮集团有限公司 | Digital signature judicial identification system and method based on block chain |
| CN110362969A (en) * | 2018-06-12 | 2019-10-22 | 腾讯科技（深圳）有限公司 | A kind of resource rights check method, apparatus and equipment |
| CN109145275A (en) * | 2018-08-07 | 2019-01-04 | 广东工业大学 | A kind of block chain electronic contract management and intelligent generating system and method |
| CN110826091A (en) * | 2018-08-14 | 2020-02-21 | 珠海金山办公软件有限公司 | File signature method and device, electronic equipment and readable storage medium |
| CN110830256A (en) * | 2018-08-14 | 2020-02-21 | 珠海金山办公软件有限公司 | File signature method and device, electronic equipment and readable storage medium |
| CN110826092A (en) * | 2018-08-14 | 2020-02-21 | 珠海金山办公软件有限公司 | File signature processing system |
| CN110309259B (en) * | 2018-10-10 | 2021-09-03 | 腾讯科技（深圳）有限公司 | Audit result data storage and query methods, and audit item storage method and device |
| US11316669B2 (en) | 2018-10-10 | 2022-04-26 | Tencent Technology (Shenzhen) Company Limited | Audit result data storage method and device, audit result data query method and device, and audit item storage method and device |
| US11700113B2 (en) | 2018-10-10 | 2023-07-11 | Tencent Technology (Shenzhen) Company Limited | Audit result data storage method and device, audit result data query method and device, and audit item storage method and device |
| CN110309259A (en) * | 2018-10-10 | 2019-10-08 | 腾讯科技（深圳）有限公司 | Audit result data storage, querying method, audit item storage method and device |
| CN109491981A (en) * | 2019-01-11 | 2019-03-19 | 珮金(上海)信息科技有限公司 | File management method and device based on block chain |
| CN111756543A (en) * | 2019-03-29 | 2020-10-09 | 区块科技股份有限公司 | Contract signing and verifying system based on block chain and implementation method thereof |
| CN110351239B (en) * | 2019-05-24 | 2022-01-25 | 平安普惠企业管理有限公司 | Block chain-based electronic contract storage method and device and electronic equipment |
| CN110351239A (en) * | 2019-05-24 | 2019-10-18 | 平安普惠企业管理有限公司 | It is a kind of based on the electronic contract storage method and device of block chain, electronic equipment |
| WO2021017350A1 (en) * | 2019-07-26 | 2021-02-04 | 深圳壹账通智能科技有限公司 | Bidding document management method and system, and computer readable storage medium |
| CN111431725A (en) * | 2020-04-12 | 2020-07-17 | 中信银行股份有限公司 | Method for signing, changing and verifying validity of electronic agreement in bank system, electronic agreement management system and readable storage medium |
| CN111224788A (en) * | 2020-04-21 | 2020-06-02 | 国网区块链科技(北京)有限公司 | Electronic contract management method, device and system based on block chain |
| CN112615719A (en) * | 2020-12-15 | 2021-04-06 | 平安消费金融有限公司 | Decentralized online contract signing method, device, equipment and medium |
| CN112615719B (en) * | 2020-12-15 | 2023-07-25 | 平安消费金融有限公司 | Off-centering on-line contract signing method, device, equipment and medium |
| WO2023035477A1 (en) * | 2021-09-10 | 2023-03-16 | 马治国 | Blockchain-based method for document validation |
| CN115664852A (en) * | 2022-12-14 | 2023-01-31 | 金钱猫科技股份有限公司 | Data management method and system based on block chain technology |
| CN115664852B (en) * | 2022-12-14 | 2023-05-23 | 金钱猫科技股份有限公司 | Data management method and system based on block chain technology |
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Application publication date: 20170308 |
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