CN111651795A - Bid document disclosing method, system and storage medium based on block chain - Google Patents
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- CN111651795A CN111651795A CN202010519471.9A CN202010519471A CN111651795A CN 111651795 A CN111651795 A CN 111651795A CN 202010519471 A CN202010519471 A CN 202010519471A CN 111651795 A CN111651795 A CN 111651795A
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Abstract
The invention provides a bidding document disclosing method, a system and a storage medium based on a block chain, wherein the bidding document disclosing method comprises the steps of S1, uploading a bidding document; step S2, calculating the information fingerprint of the bidding document; step S3, storing the bidding document and the information fingerprint; step S4, disclosing the bidding document; step S5, obtaining information fingerprint of original bidding document; step S6, comparing the information fingerprints; in step S7, it is confirmed whether the bid document disclosed is falsified. The invention has the beneficial effects that: the bidding document is endowed with non-falsification and timestamp attributes before bid evaluation, and after the bid evaluation generates a candidate for winning a bid, a supervisor can obtain two pieces of information: the bidding document information before bid evaluation and the bidding document information disclosed after bid evaluation increase the supervision grasper, the bidding document disclosure has practical effect, and the bidding organization party can strictly meet the requirements of laws and regulations.
Description
Technical Field
The invention relates to the technical field of block chains, in particular to a bidding document disclosing method, a bidding document disclosing system and a storage medium based on a block chain.
Background
The blockchain is a novel application mode of computer technologies such as distributed data storage, point-to-point transmission, a consensus mechanism, an encryption algorithm and the like, and is essentially a decentralized architecture. In a narrow sense, the blockchain is a distributed account book which is a chain data structure formed by combining data blocks in a sequential connection mode according to a time sequence and is guaranteed in a cryptographic mode and cannot be tampered and forged. Broadly speaking, the blockchain technique is a completely new distributed infrastructure and computing paradigm that utilizes blockchain data structures to verify and store data, utilizes distributed node consensus algorithms to generate and update data, cryptographically secure data transmission and access, and utilizes intelligent contracts composed of automated script code to program and manipulate data. Therefore, the blockchain system can endow the data with a non-tampering attribute and a time stamp attribute, and is particularly suitable for evidence preservation.
Hash (Hash) algorithms, i.e. Hash function algorithms. It is a one-way cipher system, i.e. it is an irreversible mapping from plain text to cipher text, only having encryption process, and having no decryption process. Meanwhile, the hash algorithm can change the input with any length to obtain the output with fixed length. The hashing algorithm can map an arbitrary length binary value to a shorter fixed length binary value, referred to as a hash value (also known as an information fingerprint). Hash values are a unique and extremely compact representation of a piece of data as a value. If a piece of plaintext is hashed, even if only one letter in the piece is altered, the subsequent hash will produce a different value. It is computationally infeasible to find two different inputs whose hash is the same value, so the hash value (information fingerprint) of the data can verify the integrity of the data.
In order to standardize the releasing activities of the invitation bulletin and the public notice information and ensure that various market subjects and the public society equally, conveniently and accurately obtain the invitation information, according to relevant law and regulation regulations, such as the invitation and tender putting law of the people's republic of China, the implementation of the invitation and tender putting law of the people's republic of China, and the like, the national development and reform committee customs sets up the releasing and managing method of the invitation and public notice information.
The nominal bidding announcement and public information called in the management method for publishing the bidding announcement and the public information are information such as qualification prequalification announcement, bidding announcement, candidate public indication of winning bid, and result public indication of winning bid of the bidding project; and the bidding announcement and the public information of the project which must be bid by the law are regulated, and the project should be published to the society by the law according to the principles of public service, transparent disclosure, high efficiency, convenience and centralized sharing except the content which needs to be kept secret or relates to trade secrets.
After the management method for releasing the bidding announcement and the public information is implemented, the bidding announcement and the public information are really disclosed, particularly, for house buildings and municipal infrastructure projects, bidding projects are required by law, and after a successful bid candidate is generated by bid evaluation, the bidding candidate must disclose bid documents of the successful bid candidate and accept supervision of each party.
However, the supervising party cannot distinguish whether the document is identical to the bid document before bid evaluation only by seeing the bid document that is disclosed, and the disclosure is not effective.
Disclosure of Invention
The invention provides a bidding document disclosing method based on a block chain, which aims to solve the problem that in the bidding process, a supervisor only sees a disclosed bidding document but cannot distinguish whether the document is consistent with the bidding document before bid evaluation.
The invention provides a bidding document disclosing method based on a block chain, which comprises the following steps:
step S1, uploading a bidding document: before evaluating bids, a bidder uploads a bid file to a block chain system;
step S2, calculating the information fingerprint of the bid document: after obtaining the bid document, the block chain system calculates the bid document to obtain an information fingerprint, wherein the information fingerprint is a value obtained by carrying out encryption calculation on the bid document;
step S3, storing the bid document and the information fingerprint: constructing a transaction message by the bidding document and the information fingerprint, or constructing a transaction message by the information fingerprint; broadcasting the transaction message into the whole blockchain network, wherein the transaction message is confirmed by the blockchain system to be one of the records which is not falsifiable and has the time stamp attribute;
step S4, disclosing the bid document: after the bid evaluation generates the candidate for winning the bid, the tenderer publicizes the bid document of the candidate for winning the bid;
step S5, acquiring information fingerprint of original bid document: the supervisor retrieves the bid document uploaded in step S1 and the corresponding information fingerprint from the blockchain system;
step S6, comparing the information fingerprints: aiming at the bid document disclosed in the step S4, calculating the information fingerprint thereof, and comparing the information fingerprint with the information fingerprint obtained in the step S5 to obtain a comparison result;
step S7, confirming whether the bid document disclosed is falsified: if the comparison result of the step S6 is that the two information fingerprints are completely consistent, it indicates that the bid document indicated by the bulletin is consistent with the bid document before bid evaluation, and the bid document is not tampered; if the comparison result of step S6 is that the two information fingerprints are not completely consistent, it indicates that the bid document indicated by the bulletin is inconsistent with the bid document before bid evaluation, and the bid document has been tampered.
As a further improvement of the present invention, in step S2, a hybrid hash algorithm is used to calculate the production information fingerprint, the bid document is compressed, the digest value of the bid document is calculated, and the compressed bid document is calculated by using the hash algorithm to obtain the information fingerprint of the bid document.
As a further improvement of the present invention, in step S2, the improved LZO lossless compression algorithm is used to compress the bid document to obtain compressed data, and then the compressed data is encrypted by the hash algorithm.
As a further improvement of the present invention, the step S2 includes:
step S21: reading in data which is a bidding document;
step S22: performing hash operation on the data, searching a hash table according to the hash operation value, and judging whether the data is in the hash table, if so, executing a step S23, otherwise, executing a step S24;
step S23: data is compressed according to the LZO format, and then step S25 is performed;
step S24: writing data and expanding a hash table;
step S25: judging whether all data are compressed, if so, executing the step S26, otherwise, executing the step S21;
step S26: and carrying out Hash calculation on the compressed data to obtain information fingerprint data.
As a further improvement of the present invention, in the step S3, the broadcast is a P2P point-to-point broadcast.
The invention also provides a bidding document disclosing system based on the block chain, which comprises the following components:
the file uploading module: before bid evaluation, uploading the bid files, wherein the uploaded bid files are transmitted to the processor module;
an audit operation module: after the bid evaluation generates a candidate for winning a bid, receiving a bid file and an information fingerprint retrieval instruction of a user, and retrieving a corresponding bid file and an information fingerprint; calculating the information fingerprint of the bid document to be disclosed, comparing the information fingerprint with the retrieved information fingerprint, and feeding back a comparison result;
the processor module: receiving the bid file uploaded by the file uploading module, calculating the information fingerprint of the bid file, and finally respectively sending the bid file and the information fingerprint storage instruction to the database module and the block chain system module; receiving an information fingerprint retrieval instruction transmitted by the audit operation module, transmitting the information fingerprint retrieval instruction to the block chain system module, acquiring a returned information fingerprint, and transmitting the information fingerprint to the audit operation module; receiving a file retrieval instruction transmitted by the audit operation module, transmitting the file retrieval instruction to the database module, acquiring a returned file, and transmitting the file to the audit operation module;
a block chain system module: receiving an information fingerprint storage instruction transmitted by the processor module, and storing the information fingerprint; receiving an information fingerprint retrieval instruction transmitted by the processor module, and returning an information fingerprint to the processor module;
a database module: receiving a file storage instruction transmitted by the processor module, and storing the file; and receiving a file retrieval instruction transmitted by the processor module, and returning the file to the processor module.
The present invention also provides a computer readable storage medium having stored thereon a computer program configured to, when invoked by a processor, perform the steps of the bid document disclosing method according to the present invention.
The invention has the beneficial effects that: first, the bidding document is allowed to be endowed with non-falsification and time stamp attributes before bid evaluation, and after the bid evaluation generates a candidate for winning a bid, a supervisor can obtain two pieces of information: bidding document information before bid evaluation and bidding document information disclosed after bid evaluation. Compared with the prior art, the method has the advantages that the supervision party only obtains the bid document information disclosed after bid evaluation, the supervision graspers are added, and the bid document disclosure has practical effect. Second, by providing two pieces of information (bid document information before bid evaluation and bid document information disclosed after bid evaluation), the bid inviting and bidding organizing party can certify strict fulfillment of the requirements of laws and regulations without tampering with the bid documents.
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FIG. 1 is a flow chart of a method of the present invention;
FIG. 2 is a flow chart of an embodiment of the present invention;
fig. 3 is a system block diagram of the present invention.
Detailed Description
The invention discloses a bidding document disclosing method based on a block chain, which allows the hash value of the bidding document to be stored in a block chain system before bid evaluation, and endows the hash value of the bidding document with non-tampering and timestamp attributes. After the bidding candidate is generated by the bid evaluation, the tenderer publicizes the bid document of the bidding candidate and receives supervision of each party. The supervisor can retrieve corresponding information from the block chain system and compare the corresponding information with the bid document to judge whether the bid document is consistent with the bid document before bid evaluation.
As shown in FIG. 1, the invention discloses a bid document disclosing method based on a block chain, comprising the following steps:
step S1, uploading a bidding document: and before bid evaluation, the bidder uploads a bid file to the block chain system.
Step S2, calculating the information fingerprint of the bid document: after obtaining the bid document, the block chain system calculates the bid document to obtain an information fingerprint, wherein the information fingerprint is a value obtained by performing encryption calculation on the bid document.
Step S3, storing the bid document and the information fingerprint: constructing a transaction message by the bidding document and the information fingerprint, or constructing a transaction message by the information fingerprint; and broadcasting the transaction message into the whole blockchain network, wherein the transaction message is confirmed by the blockchain system to become one of the records which are not falsifiable and have the time stamp attribute, so as to achieve the effect of storing the bid document and the information fingerprint, and the broadcast is P2P point-to-point broadcast.
Step S4, disclosing the bid document: after the bidding candidate is generated by the bid evaluation, the tenderer publicizes the bid document of the bidding candidate and receives supervision of each party.
Step S5, acquiring information fingerprint of original bid document: the supervisor retrieves the bid document and the corresponding information fingerprint uploaded in step S1 from the blockchain system.
Step S6, comparing the information fingerprints: and (4) calculating the information fingerprint of the bid document disclosed in the step (S4), and comparing the information fingerprint with the information fingerprint obtained in the step (S5) to obtain a comparison result.
Step S7, confirming whether the bid document disclosed is falsified: if the comparison result of the step S6 is that the two information fingerprints are completely consistent, it indicates that the bid document indicated by the bulletin is consistent with the bid document before bid evaluation, and the bid document is not tampered; if the comparison result of step S6 is that the two information fingerprints are not completely consistent, it indicates that the bid document indicated by the bulletin is inconsistent with the bid document before bid evaluation, and the bid document has been tampered.
In step S2, the hybrid hash algorithm is used to calculate the production information fingerprint, and in order to reduce the calculation amount of calculating the bid document information fingerprint, the bid document is compressed first, and then the digest value is calculated. The bidding document is compressed by using a lossless compression algorithm, so that the byte number of the bidding document is reduced, and then the compressed bidding document is calculated by using a Hash algorithm, so that the information fingerprint of the bidding document is obtained.
In step S2, in order to decompress the file quickly and efficiently, an improved lzo (lempel Ziv obeerhamer) lossless compression algorithm is used to compress the bid file to obtain compressed data, and then the compressed data is encrypted by a hash algorithm.
As shown in fig. 2, step S2 includes:
step S21: reading in data which is a bidding document.
Step S22: and performing hash operation on the data, searching the hash table according to the hash operation value, and judging whether the data is in the hash table, if so, executing the step S23, otherwise, executing the step S24.
Step S23: the data is compressed according to the LZO format, and then step S25 is performed.
Step S24: and writing data and expanding a hash table.
Step S25: and judging whether all the data are compressed completely, if so, executing the step S26, otherwise, executing the step S21.
Step S26: and carrying out Hash calculation on the compressed data to obtain information fingerprint data.
As shown in fig. 3, the present invention also discloses a bid document disclosing system based on a block chain, comprising:
the file uploading module: and before bid evaluation, uploading the bid file is allowed, and the uploaded bid file is transmitted to the processor module.
An audit operation module:
after the bid evaluation generates a candidate for winning a bid, receiving a bid file and an information fingerprint retrieval instruction of a user, and retrieving a corresponding bid file and an information fingerprint;
and calculating the information fingerprint of the disclosed bidding document, comparing the information fingerprint with the retrieved information fingerprint, and feeding back a comparison result.
The processor module:
receiving the bid file uploaded by the file uploading module, calculating the information fingerprint of the bid file, and finally respectively sending the bid file and the information fingerprint storage instruction to the database module and the block chain system module;
receiving an information fingerprint retrieval instruction transmitted by the audit operation module, transmitting the information fingerprint retrieval instruction to the block chain system module, acquiring a returned information fingerprint, and transmitting the information fingerprint to the audit operation module;
and receiving a file retrieval instruction transmitted by the audit operation module, transmitting the file retrieval instruction to the database module, acquiring a returned file, and transmitting the file to the audit operation module.
A block chain system module:
receiving an information fingerprint (contained in the transaction message) storage instruction transmitted by the processor module, and storing the information fingerprint;
and receiving an information fingerprint retrieval instruction transmitted by the processor module, and returning the information fingerprint to the processor module.
A database module:
receiving a file storage instruction transmitted by the processor module, and storing the file;
and receiving a file retrieval instruction transmitted by the processor module, and returning the file to the processor module.
The invention also discloses a computer readable storage medium storing a computer program configured to implement the steps of the bid document disclosing method of the invention when invoked by a processor.
The invention has the beneficial effects that:
first, the bidding document is allowed to be endowed with non-falsification and time stamp attributes before bid evaluation, and after the bid evaluation generates a candidate for winning a bid, a supervisor can obtain two pieces of information: bidding document information before bid evaluation and bidding document information disclosed after bid evaluation. Compared with the prior art, the method has the advantages that the supervision party only obtains the bid document information disclosed after bid evaluation, the supervision graspers are added, and the bid document disclosure has practical effect.
Second, by providing two pieces of information (bid document information before bid evaluation and bid document information disclosed after bid evaluation), the bid inviting and bidding organizing party can certify strict fulfillment of the requirements of laws and regulations without tampering with the bid documents.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (7)
1. A bid document disclosing method based on a block chain is characterized by comprising the following steps:
step S1, uploading a bidding document: before evaluating bids, a bidder uploads a bid file to a block chain system;
step S2, calculating the information fingerprint of the bid document: after obtaining the bid document, the block chain system calculates the bid document to obtain an information fingerprint, wherein the information fingerprint is a value obtained by carrying out encryption calculation on the bid document;
step S3, storing the bid document and the information fingerprint: constructing a transaction message by the bidding document and the information fingerprint, or constructing a transaction message by the information fingerprint; broadcasting the transaction message into the whole blockchain network, wherein the transaction message is confirmed by the blockchain system to be one of the records which is not falsifiable and has the time stamp attribute;
step S4, disclosing the bid document: after the bid evaluation generates the candidate for winning the bid, the tenderer publicizes the bid document of the candidate for winning the bid;
step S5, acquiring information fingerprint of original bid document: the supervisor retrieves the bid document uploaded in step S1 and the corresponding information fingerprint from the blockchain system;
step S6, comparing the information fingerprints: aiming at the bid document disclosed in the step S4, calculating the information fingerprint thereof, and comparing the information fingerprint with the information fingerprint obtained in the step S5 to obtain a comparison result;
step S7, confirming whether the bid document disclosed is falsified: if the comparison result of the step S6 is that the two information fingerprints are completely consistent, it indicates that the bid document indicated by the bulletin is consistent with the bid document before bid evaluation, and the bid document is not tampered; if the comparison result of step S6 is that the two information fingerprints are not completely consistent, it indicates that the bid document indicated by the bulletin is inconsistent with the bid document before bid evaluation, and the bid document has been tampered.
2. The bid document disclosing method according to claim 1, wherein in the step S2, the hybrid hash algorithm is used to calculate the production information fingerprint, the bid document is compressed first, then the abstract value is calculated, and then the hash algorithm is used to calculate the compressed bid document, so as to obtain the information fingerprint of the bid document.
3. The bid document disclosing method according to claim 2, wherein in the step S2, the bid document is compressed by using the improved LZO lossless compression algorithm to obtain compressed data, and then the compressed data is encrypted by using the hash algorithm.
4. The bid document disclosing method of claim 3, wherein the step S2 includes:
step S21: reading in data which is a bidding document;
step S22: performing hash operation on the data, searching a hash table according to the hash operation value, and judging whether the data is in the hash table, if so, executing a step S23, otherwise, executing a step S24;
step S23: data is compressed according to the LZO format, and then step S25 is performed;
step S24: writing data and expanding a hash table;
step S25: judging whether all data are compressed, if so, executing the step S26, otherwise, executing the step S21;
step S26: and carrying out Hash calculation on the compressed data to obtain information fingerprint data.
5. The bid document disclosing method of claim 1, wherein in the step S3, the broadcast is a P2P point-to-point broadcast.
6. A block chain based bid document revealing system, comprising:
the file uploading module: before bid evaluation, uploading the bid files, wherein the uploaded bid files are transmitted to the processor module;
an audit operation module: after the bid evaluation generates a candidate for winning a bid, receiving a bid file and an information fingerprint retrieval instruction of a user, and retrieving a corresponding bid file and an information fingerprint; calculating the information fingerprint of the bid document to be disclosed, comparing the information fingerprint with the retrieved information fingerprint, and feeding back a comparison result;
the processor module: receiving the bid file uploaded by the file uploading module, calculating the information fingerprint of the bid file, and finally respectively sending the bid file and the information fingerprint storage instruction to the database module and the block chain system module; receiving an information fingerprint retrieval instruction transmitted by the audit operation module, transmitting the information fingerprint retrieval instruction to the block chain system module, acquiring a returned information fingerprint, and transmitting the information fingerprint to the audit operation module; receiving a file retrieval instruction transmitted by the audit operation module, transmitting the file retrieval instruction to the database module, acquiring a returned file, and transmitting the file to the audit operation module;
a block chain system module: receiving an information fingerprint storage instruction transmitted by the processor module, and storing the information fingerprint; receiving an information fingerprint retrieval instruction transmitted by the processor module, and returning an information fingerprint to the processor module;
a database module: receiving a file storage instruction transmitted by the processor module, and storing the file; and receiving a file retrieval instruction transmitted by the processor module, and returning the file to the processor module.
7. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program configured to, when invoked by a processor, implement the steps of the bid document disclosing method according to any one of claims 1-5.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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