CN113254407B - Bid and tendered file storage method, system, medium and equipment based on block chain - Google Patents

Bid and tendered file storage method, system, medium and equipment based on block chain Download PDF

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CN113254407B
CN113254407B CN202110602534.1A CN202110602534A CN113254407B CN 113254407 B CN113254407 B CN 113254407B CN 202110602534 A CN202110602534 A CN 202110602534A CN 113254407 B CN113254407 B CN 113254407B
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bidding
algorithm
bid
abstract
file
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CN113254407A (en
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赵阳
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Shanghai Wanxiang Blockchain Inc
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Shanghai Wanxiang Blockchain Inc
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/10—File systems; File servers
    • G06F16/17—Details of further file system functions
    • G06F16/172—Caching, prefetching or hoarding of files
    • 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
    • G06F21/602—Providing cryptographic facilities or services
    • 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
    • G06Q30/00—Commerce
    • G06Q30/06—Buying, selling or leasing transactions
    • G06Q30/08—Auctions
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2221/00—Indexing scheme relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F2221/21—Indexing scheme relating to G06F21/00 and subgroups addressing additional information or applications relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F2221/2107—File encryption
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management

Abstract

The invention provides a block chain-based bidding document storage method, a block chain-based bidding document storage system, a block chain-based bidding document storage medium and a block chain-based bidding document storage device, which comprise the following steps: step 1: generating a public-private key pair by adopting an asymmetric encryption algorithm at the terminal equipment; step 2: uploading the public key to a bidding platform for disclosure; step 3: encrypting the bidding document by a public key on the terminal equipment to generate an encrypted document; step 4: uploading the encrypted file to a bidding platform before bidding is cut off, and after the bidding platform receives the encrypted file, performing irreversible algorithm calculation on the file to obtain a bidding abstract, and publishing the bidding abstract to a blockchain for certification; step 5: decrypting the bid file by using the private key when opening the bid, and disclosing the decrypted bid file; step 6: it is checked whether the bid document is modified after the bid expires. The invention effectively prevents the bid information from being tampered or leaked through the block chain technology, and improves the bid data safety and the platform public trust.

Description

Bid and tendered file storage method, system, medium and equipment based on block chain
Technical Field
The invention relates to the technical field of blockchains, in particular to a blockchain-based bidding document storage method, a blockchain-based bidding document storage system, a blockchain-based bidding document storage medium and a blockchain-based bidding document storage device.
Background
Bidding is that bidding parties disclose detailed information of purchasing goods, engineering or services according to related programs, suppliers or contractors participate in bidding, the two parties agree on a contract according to equal and voluntary principles, and market trading behavior based on a written purchasing contract is achieved. After signing the contract, each party shall perform the contract without any permission to change the contract or stop or terminate the contract, and the party who is missing generally needs to assume corresponding responsibility, and when both parties have errors, the parties need to respectively assume corresponding responsibility according to the size of the errors. The invitation bid and the public bid are two main bid bidding modes, and are influenced by factors such as purchasing requirements, competition degree and the like. Currently, in bidding activities, construction units take a series of means to protect their own interests, but sometimes there are illegal operations, such as bright bidding, dark bidding, false bidding, etc. Bid units may also resort to violations to disrupt the building market order. Some local authorities cannot strictly supervise the behaviour of the bidding parties. The reason for this is that the bidding process is largely not public and transparent, and the security of the data is not high enough, and is subject to tampering.
Patent document CN110020927a (application number: CN 201811513065.0) discloses a block chain-based public bidding method, comprising the steps of: the bidding party issues bidding bulletins, and bidding information is written into the blockchain by using hash-like encryption; the bidding party obtains bidding information and obtains wallet addresses, submits the wallet addresses to the bidding party, and the bidding party adds the addresses into the access sequence and returns the position id of the addresses in the sequence; the bidding party submits a bidding document and a guarantee to the bidding party by using the position id; if the evidence material exists, the bidder uploads the evidence material to a third party file storage system to obtain a storage id, and submits the id; 5) The bidding party analyzes and encrypts the bidding document and writes the bidding document into the blockchain; 6) And submitting the bidding document again by the bidding party within the bidding opening time, encrypting by the bidding party, comparing with the information abstract written in the chain before, and marking the bidding document which has the same ciphertext and meets the admission condition as effective bidding.
The bidding data in the current bidding platform is stored in a centralized mode, and is responsible for maintenance by the platform, so that the bidding data cannot be tampered or leaked by the platform.
Disclosure of Invention
In view of the defects in the prior art, the invention aims to provide a block chain-based bidding document storage method, a block chain-based bidding document storage system, a block chain-based bidding document storage medium and a block chain-based bidding document storage device.
The block chain-based bidding document storage method provided by the invention comprises the following steps:
step 1: generating a public-private key pair by adopting an asymmetric encryption algorithm at the terminal equipment;
step 2: uploading the public key to a bidding platform for disclosure;
step 3: encrypting the bidding document by a public key on the terminal equipment to generate an encrypted document;
step 4: uploading the encrypted file to a bidding platform before bidding is cut off, and after the bidding platform receives the encrypted file, performing irreversible algorithm calculation on the file to obtain a bidding abstract, and publishing the bidding abstract to a blockchain for certification;
step 5: decrypting the bid file by using the private key when opening the bid, and disclosing the decrypted bid file;
step 6: it is checked whether the bid document is modified after the bid expires.
Preferably, the bid file includes any format file and any data type;
the file in any format comprises a plurality of fields, a plurality of sections of characters, pictures and music;
the arbitrary data types include selecting encryption, non-encryption, compression, and non-compression for the entered data form.
Preferably, the asymmetric encryption algorithm includes: public key encryption algorithms Diffie-Hellman, el Gamal and digital signature algorithm DSA in RSA, elliptic curve cryptography ECC, diffie-Hellman key exchange protocols;
the irreversible algorithm comprises a HASH algorithm and a MAC algorithm;
the HASH algorithm comprises an MD5 information abstract algorithm, a SHA1 algorithm and a SHA256 algorithm;
the MAC algorithm comprises an HmacMD5 algorithm, an HmacSHA1 algorithm and an HmacSHA256 algorithm.
Preferably, the step 6 includes:
step 6.1: acquiring bidding documents and public keys disclosed by other bidding enterprises;
step 6.2: encrypting the bid file using the public key;
step 6.3: calculating a bid abstract by an irreversible algorithm on the encrypted bid file;
step 6.4: comparing the calculated bid abstract with the abstract stored in the blockchain, if the bid abstract is consistent with the abstract stored in the blockchain, the bid document is not modified, and if the bid document is not consistent with the abstract, the bid document is modified.
The block chain-based bidding document storage system provided by the invention comprises:
module M1: generating a public-private key pair by adopting an asymmetric encryption algorithm at the terminal equipment;
module M2: uploading the public key to a bidding platform for disclosure;
module M3: encrypting the bidding document by a public key on the terminal equipment to generate an encrypted document;
module M4: uploading the encrypted file to a bidding platform before bidding is cut off, and after the bidding platform receives the encrypted file, performing irreversible algorithm calculation on the file to obtain a bidding abstract, and publishing the bidding abstract to a blockchain for certification;
module M5: decrypting the bid file by using the private key when opening the bid, and disclosing the decrypted bid file;
module M6: it is checked whether the bid document is modified after the bid expires.
Preferably, the bid file includes any format file and any data type;
the file in any format comprises a plurality of fields, a plurality of sections of characters, pictures and music;
the arbitrary data types include selecting encryption, non-encryption, compression, and non-compression for the entered data form.
Preferably, the asymmetric encryption algorithm includes: public key encryption algorithms Diffie-Hellman, el Gamal and digital signature algorithm DSA in RSA, elliptic curve cryptography ECC, diffie-Hellman key exchange protocols;
the irreversible algorithm comprises a HASH algorithm and a MAC algorithm;
the HASH algorithm comprises an MD5 information abstract algorithm, a SHA1 algorithm and a SHA256 algorithm;
the MAC algorithm comprises an HmacMD5 algorithm, an HmacSHA1 algorithm and an HmacSHA256 algorithm.
Preferably, the module M6 comprises:
module M6.1: acquiring bidding documents and public keys disclosed by other bidding enterprises;
module M6.2: encrypting the bid file using the public key;
module M6.3: calculating a bid abstract by an irreversible algorithm on the encrypted bid file;
module M6.4: comparing the calculated bid abstract with the abstract stored in the blockchain, if the bid abstract is consistent with the abstract stored in the blockchain, the bid document is not modified, and if the bid document is not consistent with the abstract, the bid document is modified.
According to the present invention there is provided a computer readable storage medium storing a computer program which when executed by a processor performs the steps of the method described above.
According to the invention, the bidding document storage device based on the blockchain comprises: a controller;
the controller includes the computer readable storage medium storing a computer program which when executed by a processor performs the steps of the blockchain-based bidding document storage method; alternatively, the controller includes the blockchain-based bidding document storage system.
Compared with the prior art, the invention has the following beneficial effects:
(1) The invention solves the problem of safe storage of bidding document content before bidding by adopting a structure of encrypting a non-bidding document terminal and storing a platform;
(2) The invention solves the problem that the bidding document is likely to be modified after the document is submitted by the expiration date by adopting the blockchain certification technology;
(3) The invention provides a block chain-based bidding document encryption storage method, which can prevent bidding information from being tampered or leaked, and improve bidding data security and platform public trust.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
FIG. 1 is a flow chart of the method of the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present invention.
Examples:
the block chain-based bidding document storage method provided by the invention comprises the following steps: step 1: generating a public-private key pair by adopting an asymmetric encryption algorithm at the terminal equipment; step 2: uploading the public key to a bidding platform for disclosure; step 3: encrypting the bidding document by a public key on the terminal equipment to generate an encrypted document; step 4: uploading the encrypted file to a bidding platform before bidding is cut off, and after the bidding platform receives the encrypted file, performing irreversible algorithm calculation on the file to obtain a bidding abstract, and publishing the bidding abstract to a blockchain for certification; step 5: decrypting the bid file by using the private key when opening the bid, and disclosing the decrypted bid file; step 6: it is checked whether the bid document is modified after the bid expires.
The bidding files comprise files in any format and any data type; the file in any format comprises a plurality of fields, a plurality of sections of characters, pictures and music; the arbitrary data types include selecting encryption, non-encryption, compression, and non-compression for the entered data form. Medium asymmetric encryption algorithm: an algorithm of cryptography refers to encryption algorithms that encrypt and decrypt data using different keys. Common public key encryption algorithms: RSA, elliptic curve cryptography ECC, diffie-Hellman, el Gamal, DSA, etc. as public key encryption algorithms in Diffie-Hellman key exchange protocols. Common codebases supporting public key encryption algorithms are: openSSL, crypto ++, cryptLib, etc. The irreversible algorithm comprises a HASH algorithm and a MAC algorithm; the HASH algorithm comprises an MD5 information abstract algorithm, a SHA1 algorithm and a SHA256 algorithm; the MAC algorithm comprises an HmacMD5 algorithm, an HmacSHA1 algorithm and an HmacSHA256 algorithm.
The step 6 comprises the following steps: step 6.1: acquiring bidding documents and public keys disclosed by other bidding enterprises; step 6.2: encrypting the bid file using the public key; step 6.3: calculating a bid abstract by an irreversible algorithm on the encrypted bid file; step 6.4: comparing the calculated bid abstract with the abstract stored in the blockchain, if the bid abstract is consistent with the abstract stored in the blockchain, the bid document is not modified, and if the bid document is not consistent with the abstract, the bid document is modified.
The block chain-based bidding document storage system provided by the invention comprises: module M1: generating a public-private key pair by adopting an asymmetric encryption algorithm at the terminal equipment; module M2: uploading the public key to a bidding platform for disclosure; module M3: encrypting the bidding document by a public key on the terminal equipment to generate an encrypted document; module M4: uploading the encrypted file to a bidding platform before bidding is cut off, and after the bidding platform receives the encrypted file, performing irreversible algorithm calculation on the file to obtain a bidding abstract, and publishing the bidding abstract to a blockchain for certification; module M5: decrypting the bid file by using the private key when opening the bid, and disclosing the decrypted bid file; module M6: it is checked whether the bid document is modified after the bid expires.
The bidding files comprise files in any format and any data type; the file in any format comprises a plurality of fields, a plurality of sections of characters, pictures and music; the arbitrary data types include selecting encryption, non-encryption, compression, and non-compression for the entered data form. Medium asymmetric encryption algorithm: an algorithm of cryptography refers to encryption algorithms that encrypt and decrypt data using different keys. Common public key encryption algorithms: RSA, elliptic curve cryptography ECC, diffie-Hellman, el Gamal, DSA, etc. as public key encryption algorithms in Diffie-Hellman key exchange protocols. Common codebases supporting public key encryption algorithms are: openSSL, crypto ++, cryptLib, etc. The irreversible algorithm comprises a HASH algorithm and a MAC algorithm; the HASH algorithm comprises an MD5 information abstract algorithm, a SHA1 algorithm and a SHA256 algorithm; the MAC algorithm comprises an HmacMD5 algorithm, an HmacSHA1 algorithm and an HmacSHA256 algorithm.
The module M6 includes: module M6.1: acquiring bidding documents and public keys disclosed by other bidding enterprises; module M6.2: encrypting the bid file using the public key; module M6.3: calculating a bid abstract by an irreversible algorithm on the encrypted bid file; module M6.4: comparing the calculated bid abstract with the abstract stored in the blockchain, if the bid abstract is consistent with the abstract stored in the blockchain, the bid document is not modified, and if the bid document is not consistent with the abstract, the bid document is modified.
According to the present invention there is provided a computer readable storage medium storing a computer program which when executed by a processor performs the steps of the method described above.
According to the invention, the bidding document storage device based on the blockchain comprises: a controller;
the controller includes the computer readable storage medium storing a computer program which when executed by a processor performs the steps of the blockchain-based bidding document storage method; alternatively, the controller includes the blockchain-based bidding document storage system.
Those skilled in the art will appreciate that the systems, apparatus, and their respective modules provided herein may be implemented entirely by logic programming of method steps such that the systems, apparatus, and their respective modules are implemented as logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers, etc., in addition to the systems, apparatus, and their respective modules being implemented as pure computer readable program code. Therefore, the system, the apparatus, and the respective modules thereof provided by the present invention may be regarded as one hardware component, and the modules included therein for implementing various programs may also be regarded as structures within the hardware component; modules for implementing various functions may also be regarded as being either software programs for implementing the methods or structures within hardware components.
The foregoing describes specific embodiments of the present invention. It is to be understood that the invention is not limited to the particular embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without affecting the spirit of the invention. The embodiments of the present application and features in the embodiments may be combined with each other arbitrarily without conflict.

Claims (3)

1. A blockchain-based bidding document storage method, comprising:
step 1: generating a public-private key pair by adopting an asymmetric encryption algorithm at the terminal equipment;
step 2: uploading the public key to a bidding platform for disclosure;
step 3: encrypting the bidding document by a public key on the terminal equipment to generate an encrypted document;
step 4: uploading the encrypted file to a bidding platform before bidding is cut off, and after the bidding platform receives the encrypted file, performing irreversible algorithm calculation on the file to obtain a bidding abstract, and publishing the bidding abstract to a blockchain for certification;
step 5: the terminal equipment uses the private key to decrypt the encrypted file when opening the bid, and the decrypted bid file is disclosed;
step 6: the bidding platform checks whether the bidding document is modified after bidding is finished;
the step 6 comprises the following steps:
step 6.1: acquiring a public bidding document and a public key;
step 6.2: encrypting the bid file using the public key;
step 6.3: calculating a bid abstract by an irreversible algorithm on the encrypted bid file;
step 6.4: comparing the calculated bidding abstract with the abstract stored in the blockchain, if the bidding abstract is consistent with the abstract stored in the blockchain, indicating that the bidding document is not modified, and if the bidding document is inconsistent with the abstract, indicating that the bidding document is modified;
the bidding files comprise files in any format and any data type;
the file in any format comprises a plurality of fields, a plurality of sections of characters, pictures and music;
the arbitrary data types include selecting encryption, non-encryption, compression and non-compression for the entered data form;
the asymmetric encryption algorithm includes: public key encryption algorithms Diffie-Hellman, el Gamal and digital signature algorithm DSA in RSA, elliptic curve cryptography ECC, diffie-Hellman key exchange protocols;
the irreversible algorithm comprises a HASH algorithm and a MAC algorithm;
the HASH algorithm comprises an MD5 information abstract algorithm, a SHA1 algorithm and a SHA256 algorithm;
the MAC algorithm comprises an HmacMD5 algorithm, an HmacSHA1 algorithm and an HmacSHA256 algorithm.
2. A blockchain-based bidding document storage system, comprising:
module M1: generating a public-private key pair by adopting an asymmetric encryption algorithm at the terminal equipment;
module M2: uploading the public key to a bidding platform for disclosure;
module M3: encrypting the bidding document by a public key on the terminal equipment to generate an encrypted document;
module M4: uploading the encrypted file to a bidding platform before bidding is cut off, and after the bidding platform receives the encrypted file, performing irreversible algorithm calculation on the file to obtain a bidding abstract, and publishing the bidding abstract to a blockchain for certification;
module M5: the terminal equipment uses the private key to decrypt the encrypted file when opening the bid, and the decrypted bid file is disclosed;
module M6: the bidding platform checks whether the bidding document is modified after bidding is finished;
the module M6 includes:
module M6.1: acquiring a public bidding document and a public key;
module M6.2: encrypting the bid file using the public key;
module M6.3: calculating a bid abstract by an irreversible algorithm on the encrypted bid file;
module M6.4: comparing the calculated bidding abstract with the abstract stored in the blockchain, if the bidding abstract is consistent with the abstract stored in the blockchain, indicating that the bidding document is not modified, and if the bidding document is inconsistent with the abstract, indicating that the bidding document is modified;
the bidding files comprise files in any format and any data type;
the file in any format comprises a plurality of fields, a plurality of sections of characters, pictures and music;
the arbitrary data types include selecting encryption, non-encryption, compression and non-compression for the entered data form;
the asymmetric encryption algorithm includes: public key encryption algorithms Diffie-Hellman, el Gamal and digital signature algorithm DSA in RSA, elliptic curve cryptography ECC, diffie-Hellman key exchange protocols;
the irreversible algorithm comprises a HASH algorithm and a MAC algorithm;
the HASH algorithm comprises an MD5 information abstract algorithm, a SHA1 algorithm and a SHA256 algorithm;
the MAC algorithm comprises an HmacMD5 algorithm, an HmacSHA1 algorithm and an HmacSHA256 algorithm.
3. A computer readable storage medium storing a computer program, which when executed by a processor implements the steps of the method of claim 1.
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CN113704794B (en) * 2021-09-02 2023-09-26 国泰新点软件股份有限公司 Bid file processing method and device in electronic bidding system
CN114553488A (en) * 2022-01-24 2022-05-27 四川华西集采电子商务有限公司 Square encryption bidding method and system
CN114422156B (en) * 2022-03-31 2022-06-28 北京国电通网络技术有限公司 Bidding file compensation authentication method and system based on block chain

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110020927A (en) * 2018-12-11 2019-07-16 浙江工商大学 A kind of open Bidding Methods based on block chain
CN111767582A (en) * 2020-06-30 2020-10-13 平安国际智慧城市科技股份有限公司 Block chain-based electronic bidding method, device, equipment and storage medium
CN111861473A (en) * 2020-07-31 2020-10-30 贵州光奕科科技有限公司 Electronic bidding system and method
CN112613956A (en) * 2020-12-31 2021-04-06 中国工商银行股份有限公司 Bidding processing method and device

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111651795A (en) * 2020-06-09 2020-09-11 吴其震 Bid document disclosing method, system and storage medium based on block chain
CN111859437A (en) * 2020-07-31 2020-10-30 贵州光奕科科技有限公司 Electronic bidding document multi-layer encryption and decryption system for electronic bidding
CN112017017A (en) * 2020-09-03 2020-12-01 罗官 Bidding method and system based on block chain
CN112580055A (en) * 2020-12-02 2021-03-30 上海同在互联网科技有限公司 Trusted electronic bid opening method, device and system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110020927A (en) * 2018-12-11 2019-07-16 浙江工商大学 A kind of open Bidding Methods based on block chain
CN111767582A (en) * 2020-06-30 2020-10-13 平安国际智慧城市科技股份有限公司 Block chain-based electronic bidding method, device, equipment and storage medium
CN111861473A (en) * 2020-07-31 2020-10-30 贵州光奕科科技有限公司 Electronic bidding system and method
CN112613956A (en) * 2020-12-31 2021-04-06 中国工商银行股份有限公司 Bidding processing method and device

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