CN110827121A - Block chain-based electronic bidding method, device and storage medium - Google Patents
Block chain-based electronic bidding method, device and storage medium Download PDFInfo
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- CN110827121A CN110827121A CN201910998945.XA CN201910998945A CN110827121A CN 110827121 A CN110827121 A CN 110827121A CN 201910998945 A CN201910998945 A CN 201910998945A CN 110827121 A CN110827121 A CN 110827121A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q30/00—Commerce
- G06Q30/06—Buying, selling or leasing transactions
- G06Q30/0601—Electronic shopping [e-shopping]
- G06Q30/0611—Request for offers or quotes
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q30/00—Commerce
- G06Q30/06—Buying, selling or leasing transactions
- G06Q30/08—Auctions
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
- H04L63/0428—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
- H04L63/0428—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload
- H04L63/0442—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload wherein the sending and receiving network entities apply asymmetric encryption, i.e. different keys for encryption and decryption
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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
- H04L9/008—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols involving homomorphic encryption
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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
- H04L9/50—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols using hash chains, e.g. blockchains or hash trees
Abstract
The embodiment of the invention provides an electronic bidding method, electronic bidding equipment and a storage medium based on a block chain. The embodiment of the invention adds the random number in the homomorphic encryption process of the sensitive information in the bidding document by adopting the homomorphic encryption method, can effectively prevent a competitor from forging a large amount of business money and comparing the forged business money with the bid money after homomorphic encryption in the block chain, thereby obtaining the risk of the bid money, avoiding the leakage of the sensitive business information and ensuring the benefit of a bidder.
Description
Technical Field
The embodiment of the invention relates to the technical field of communication, in particular to an electronic bidding method, electronic bidding equipment and a storage medium based on a block chain.
Background
In an electronic bidding system, some sensitive information, such as the bid amount, may be present in the electronic bid. For the purpose of fair bidding, the bid amount needs to be disclosed after the bidding is finished. However, historical bid amounts are readily utilized and analyzed to derive bidding laws, resulting in unfair competition.
Disclosure of Invention
The embodiment of the invention provides an electronic bidding method, electronic bidding equipment and a storage medium based on a block chain, which are used for avoiding leakage of sensitive business information and guaranteeing the benefits of bidders.
In a first aspect, an embodiment of the present invention provides an electronic bidding method based on a block chain, including:
the bidder node receiving an electronic bid broadcasted by the bidder node in the blockchain network, the electronic bid including information of a plurality of components to be bid;
the bidder node adopts the homomorphic encryption public key of the bidder node to homomorphic encrypt the quotation information and the random number of each component in the plurality of components to obtain a plurality of first encryption information;
the bidder node performs homomorphic encryption on the total quotation information and the random numbers of the components by adopting a homomorphic encryption public key of the bidder node to obtain second encryption information;
the bidder node performs homomorphic encryption on the total quotation information and the random numbers of the multiple components by adopting a homomorphic encryption public key of the sponsor node to obtain third encryption information;
the bidder node broadcasting the plurality of first, second, and third encrypted information in the blockchain network;
wherein the blockchain network includes the bidder node and the sponsor node.
In a second aspect, an embodiment of the present invention provides an electronic bidding method based on a block chain, including:
a sponsor node broadcasting an electronic bid in a blockchain network, the electronic bid including information for a plurality of components being bid on;
the method comprises the steps that a plurality of first encryption information, second encryption information and third encryption information which are broadcasted by a bidder node in a block chain network are received by the bidder node, wherein the first encryption information is obtained by performing homomorphic encryption on quotation information and a random number of each component in a plurality of components by the bidder node by using a homomorphic encryption public key of the bidder node, the second encryption information is obtained by performing homomorphic encryption on total quotation information and the random number of the components by the bidder node by using a homomorphic encryption public key of the bidder node, and the third encryption information is obtained by performing homomorphic encryption on the total quotation information and the random number of the components by the bidder node by using a homomorphic encryption public key of the bidder node;
the tenderer node receives an encrypted random number broadcasted by the bidder node in the block chain network, wherein the encrypted random number is obtained by homomorphically encrypting the random number by the tenderer node by adopting a homomorphic encryption public key of the tenderer node;
the sending party node decrypts the third encrypted information by adopting a homomorphic encryption private key of the sending party node to obtain a decryption result;
the sending party node decrypts the encrypted random number by adopting a homomorphic encryption private key of the sending party node to obtain the random number;
the transmitting party node calculates the difference value between the decryption result and the random number;
the tenderer node adopts the homomorphic encryption public key of the bidder node to homomorphically encrypt the random number to obtain fourth encryption information;
the sending party node obtains a homomorphic encrypted first result corresponding to the quotation information of each component in the multiple components according to the multiple first encryption information and the fourth encryption information;
the sending party node obtains a homomorphic encrypted second result corresponding to the total quotation information of the plurality of components according to the second encryption information and the fourth encryption information;
when the tenderer node determines that the sum of homomorphic encrypted first results corresponding to the quotation information of each component in the plurality of components is equal to the second result, homomorphic encryption public keys of the tenderer node are adopted to homomorphic encrypt the difference values to obtain fifth encrypted information;
when the tenderer node determines that the fifth cryptographic information is the same as the second result, the tenderer node determines that the bidder node is verified.
In a third aspect, an embodiment of the present invention provides a bidder node, including:
a memory;
a processor;
a communication interface; and
a computer program;
wherein the computer program is stored in the memory and configured to be executed by the processor to:
receiving an electronic bidding document broadcasted by a sponsor node in a blockchain network through the communication interface, wherein the electronic bidding document comprises information of a plurality of bidding components;
adopting the homomorphic encryption public key of the bidder node to homomorphic encrypt the quotation information and the random number of each component in the plurality of components to obtain a plurality of first encryption information;
adopting a homomorphic encryption public key of the bidder node to homomorphically encrypt the total quotation information and the random numbers of the components to obtain second encryption information;
carrying out homomorphic encryption on the total quotation information and the random numbers of the multiple components by adopting a homomorphic encryption public key of the node of the sender to obtain third encryption information;
broadcasting the plurality of first encrypted information, the second encrypted information, and the third encrypted information in the blockchain network through the communication interface;
wherein the blockchain network includes the bidder node and the sponsor node.
In a fourth aspect, an embodiment of the present invention provides a node for a publisher, including:
a memory;
a processor;
a communication interface; and
a computer program;
wherein the computer program is stored in the memory and configured to be executed by the processor to:
broadcasting an electronic bidding document in a blockchain network through the communication interface, the electronic bidding document including information of a plurality of components to be bid on;
receiving a plurality of first encryption information, second encryption information and third encryption information broadcasted by the bidder node in the blockchain network through the communication interface, wherein the plurality of first encryption information is obtained by the bidder node performing homomorphic encryption on quotation information and a random number of each of the plurality of components by using a homomorphic encryption public key of the bidder node, the second encryption information is obtained by the bidder node performing homomorphic encryption on total quotation information and the random number of the plurality of components by using the homomorphic encryption public key of the bidder node, and the third encryption information is obtained by the bidder node performing homomorphic encryption on the total quotation information and the random number of the plurality of components by using the homomorphic encryption public key of the bidder node;
receiving an encrypted random number broadcasted by the bidder node in the block chain network through the communication interface, wherein the encrypted random number is obtained by homomorphically encrypting the random number by the bidder node by adopting a homomorphic encryption public key of the sponsor node;
decrypting the third encrypted information by adopting a homomorphic encryption private key of the sender node to obtain a decryption result;
decrypting the encrypted random number by adopting a homomorphic encryption private key of the node of the sending party to obtain the random number;
calculating a difference between the decryption result and the random number;
homomorphic encryption is carried out on the random number by adopting a homomorphic encryption public key of the bidder node to obtain fourth encryption information;
according to the first encryption information and the fourth encryption information, obtaining a homomorphic encrypted first result corresponding to the quotation information of each part in the parts;
obtaining homomorphic encrypted second results corresponding to the overall quotation information of the plurality of components according to the second encryption information and the fourth encryption information;
when the tenderer node determines that the sum of homomorphic encrypted first results corresponding to the quotation information of each component in the plurality of components is equal to the second result, homomorphic encryption public keys of the tenderer node are adopted to homomorphic encrypt the difference values to obtain fifth encrypted information;
when the tenderer node determines that the fifth cryptographic information is the same as the second result, the tenderer node determines that the bidder node is verified.
In a fifth aspect, the present invention provides a computer-readable storage medium, on which a computer program is stored, the computer program being executed by a processor to implement the method of the first aspect or the second aspect.
According to the electronic bidding method, the electronic bidding equipment and the storage medium based on the block chain, provided by the embodiment of the invention, the random number is added in the process of carrying out homomorphic encryption on the sensitive information in the bidding document by adopting the homomorphic encryption method, so that a competitor can be effectively prevented from counterfeiting a large amount of business money and then comparing the forged business money with the bid money after homomorphic encryption in the block chain, the risk of the bid money is obtained, the leakage of the sensitive business information is avoided, and the benefit of a bidder is guaranteed.
Drawings
Fig. 1 is a schematic diagram of a communication system provided by an embodiment of the present invention;
FIG. 2 is a flowchart of an electronic bidding method based on block chains according to an embodiment of the present invention;
FIG. 3 is a flowchart of an electronic bidding method based on block chains according to another embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a bidder node according to an embodiment of the invention;
fig. 5 is a schematic structural diagram of a node of a sending target according to an embodiment of the present invention.
With the foregoing drawings in mind, certain embodiments of the disclosure have been shown and described in more detail below. These drawings and written description are not intended to limit the scope of the disclosed concepts in any way, but rather to illustrate the concepts of the disclosure to those skilled in the art by reference to specific embodiments.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
The electronic bidding method based on the block chain provided by the embodiment of the invention can be applied to the communication system shown in fig. 1. As shown in fig. 1, the communication system includes: the system comprises an accounting node, a bidder node A, a bidder node and a bidder node B, wherein the accounting node, the bidder node A, the bidder node and the bidder node B are participating nodes in a block chain network. It is understood that the description is only illustrative and does not limit the number and types of nodes in the blockchain network. The accounting node can be one or a plurality of cloud servers, the cloud servers are a server cluster, a plurality of servers are arranged, the server cluster is similar to a universal computer framework, and the cloud servers comprise processors, hard disks, memories, system buses and the like. The user node may specifically be a user terminal, e.g. a smartphone, a tablet, a personal computer, etc.
In addition, each node in the blockchain network may correspond to a blockchain public key and a blockchain private key, specifically, the blockchain public key and the blockchain private key of the node are used to identify the identity of the node, and the blockchain public key and the blockchain private key of the node correspond to the blockchain identification of the node, respectively. In addition, each node may also correspond to a homomorphic encryption public key and a homomorphic encryption private key, and the homomorphic encryption public key and the homomorphic encryption private key corresponding to the node are used for the homomorphic encryption or decryption of the node.
The embodiment of the invention provides an electronic bidding method based on a block chain, and aims to solve the technical problems in the prior art.
The following describes the technical solutions of the present invention and how to solve the above technical problems with specific embodiments. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present invention will be described below with reference to the accompanying drawings.
Fig. 2 is a flowchart of an electronic bidding method based on a block chain according to an embodiment of the present invention. The embodiment of the invention provides an electronic bidding method based on a block chain, aiming at the technical problems in the prior art, and the method comprises the following specific steps:
In this embodiment, the tenderer node broadcasts an electronic tender in the blockchain network, the electronic tender including information for a plurality of components being tendered. In addition, the electronic bidding document may further include a homomorphic encryption algorithm adopted by the bidder node designated by the sponsor node and participating in the bidding, and a maximum amount of the electronic bidding document, and optionally, the maximum amount of the electronic bidding document is T.
Optionally, the tenderer node may sign the electronic bidding document by using its own private key of the blockchain, and issue the signed electronic bidding document to the blockchain network in a broadcast message manner, so that each node in the blockchain network, for example, the accounting node, the bidder node a, and the bidder node B may receive the signed electronic bidding document. Thereby enabling the bidder node a and the bidder node B to participate in bidding after receiving the signed electronic bidding document.
In addition, after the accounting node receives the signed electronic signature broadcasted by the sponsor node in the blockchain network, whether sufficient money amount exists in the account of the sponsor node is determined by inquiring the blockchain account, that is, the accounting node needs to determine whether the money amount in the account of the sponsor node is greater than or equal to T, and if yes, the T money amount in the account of the sponsor node is frozen.
In addition, the bidder node a, the bidder node B, and the tenderer node may broadcast respective homomorphic encryption public keys in the blockchain network, so that the accounting node stores the respective homomorphic encryption public keys of the bidder node a, the bidder node B, and the tenderer node in a blockchain ledger for use by other nodes in the blockchain network. Optionally, the bidder node a, the bidder node B, and the tenderer node may sign their respective homomorphic encryption public keys by using their respective block chain private keys, and further broadcast the homomorphic encryption public keys signed by each other in the block chain network.
In this embodiment, there may be more than one bidder node in the block chain network, for example, the bidder node a and the bidder node B described in fig. 1, and the bidder node a and the bidder node B may respectively respond to the electronic bid broadcast by the sponsor node after receiving the electronic bid. That is, both bidder node a and bidder node B may broadcast a bid document in the blockchain network, where the bid document includes bid information for each of a plurality of components and total bid information for the plurality of components. Here, the bidder node a is schematically illustrated as an example. For example, the bids of bidder node a for each of the plurality of parts are respectively noted as (P1, P2 … Pn), and the overall bids of bidder node a for the plurality of parts are noted as Psum. In addition, the bidding document of the bidder node a needs to include a random number, which is denoted as Rand.
Before the opening time is over, the bidder node A adopts the own homomorphic encryption public key K to homomorphically encrypt P1+ Rand, P2+ Rand, … and Pn + Rand respectively to obtain P1a and P2a … Pna in sequence, wherein P1a and P2a … Pna are marked as a plurality of pieces of first encryption information.
And 203, the bidder node performs homomorphic encryption on the total quotation information of the components and the random number by adopting the homomorphic encryption public key of the bidder node to obtain second encryption information.
The bidder node A homomorphically encrypts Psum + Rand by using the homomorphic encryption public key K of the node A to obtain Psuma, wherein the Psuma is recorded as second encryption information.
And 204, the bidder node adopts the homomorphic encryption public key of the sponsor node to homomorphic encrypt the total quotation information and the random number of the components to obtain third encryption information.
The bidder node a may further obtain a homomorphic encryption public key of the sender node by querying the block chain account book, and further, the bidder node a performs homomorphic encryption on the Psum + Rand by using the homomorphic encryption public key of the sender node to obtain Psumb, where the Psumb is recorded as third encryption information.
It can be understood that P1, P2 … Pn, and Psum respectively perform the same operation with Rand, and the operation may be addition or subtraction, and the addition in this embodiment is taken as an example, and P1+ Rand is homomorphic encrypted to obtain P1a, P2+ Rand is homomorphic encrypted to obtain P2a and …, and Pn + Rand is homomorphic encrypted to obtain Pna.
Wherein the blockchain network includes the bidder node and the sponsor node.
Further, the bidder node a may broadcast a plurality of first encryption information (P1a, P2a … Pna), second encryption information (Psuma), and third encryption information (Psumb) in the blockchain network.
Optionally, the broadcasting, by the bidder node, the plurality of first encryption information, the plurality of second encryption information, and the plurality of third encryption information in the blockchain network includes: the bidder node broadcasts bidding information in the blockchain network, the bidding information including the plurality of first encrypted information, the second encrypted information, and the third encrypted information.
For example, bidder node a may broadcast bid information, which may be in particular a bid application file as described above, in the blockchain network. The bid information includes a plurality of first encryption information (P1a, P2a … Pna), second encryption information (Psuma), and third encryption information (Psumb).
Optionally, before the bidder node broadcasts the bid information in the blockchain network, the method further includes: the bidder node signs the bidding information by adopting a block chain private key of the bidder node to obtain signed bidding information; the bidder node broadcasting bid information in the blockchain network, comprising: and the bidder node broadcasts the signed bid information in the block chain network.
For example, the bidder node a may sign the bid information using its own blockchain private key to obtain signed bid information, and further, the bidder node a broadcasts the signed bid information to the blockchain network, where the signed bid information includes a plurality of first encryption information (P1a, P2a … Pna), second encryption information (Psuma), and third encryption information (Psumb).
Similarly, the node B of the bidder may also broadcast the bid information in the blockchain network, and the bid information of the node B of the bidder is similar to the bid information of the node a of the bidder, and is not described herein again.
The embodiment of the invention adds the random number in the homomorphic encryption process of the sensitive information in the bidding document by adopting the homomorphic encryption method, can effectively prevent a competitor from forging a large amount of business money and comparing the forged business money with the bid money after homomorphic encryption in the block chain, thereby obtaining the risk of the bid money, avoiding the leakage of the sensitive business information and ensuring the benefit of a bidder.
Fig. 3 is a flowchart of an electronic bidding method based on a block chain according to another embodiment of the present invention. On the basis of the foregoing embodiments, the electronic bidding method based on the block chain provided in this embodiment specifically includes the following steps:
step 301, the sponsor node broadcasts an electronic bid in the blockchain network, the electronic bid including information for a plurality of components being bid on.
In this embodiment, the tenderer node broadcasts an electronic tender in the blockchain network, the electronic tender including information for a plurality of components being tendered. In addition, the electronic bidding document may further include a homomorphic encryption algorithm adopted by the bidder node designated by the sponsor node and participating in the bidding, and a maximum amount of the electronic bidding document, and optionally, the maximum amount of the electronic bidding document is T.
Step 302, the tenderer node receives a plurality of first encryption information, second encryption information and third encryption information broadcasted by the bidder node in the blockchain network, wherein the plurality of first encryption information is obtained by the bidder node performing homomorphic encryption on the quotation information and the random number of each of the plurality of components by using the homomorphic encryption public key of the bidder node, the second encryption information is obtained by the bidder node performing homomorphic encryption on the total quotation information and the random number of the plurality of components by using the homomorphic encryption public key of the bidder node, and the third encryption information is obtained by the bidder node performing homomorphic encryption on the total quotation information and the random number of the plurality of components by using the homomorphic encryption public key of the tenderer node.
For example, after receiving the electronic bid broadcast by the bidder node, the bidder node a and the bidder node B may respond to the electronic bid. For example, the bidding information which is broadcasted by the bidder node a in the blockchain network and signed by the private key of the bidder node a includes a plurality of first encryption information, second encryption information and third encryption information, wherein the plurality of first encryption information is obtained by the bidder node a performing homomorphic encryption on the quotation information and the random number of each of the plurality of components by using the homomorphic encryption public key of the bidder node a, the second encryption information is obtained by the bidder node a performing homomorphic encryption on the total quotation information and the random number of the plurality of components by using the homomorphic encryption public key of the bidder node a, and the third encryption information is obtained by the bidder node a performing homomorphic encryption on the total quotation information and the random number of the plurality of components by using the homomorphic encryption public key of the bidder node a. For example, the plurality of pieces of first encryption information are (P1a, P2a … Pna), the second encryption information are Psuma, and the third encryption information are Psumb.
Step 303, the tenderer node receives an encrypted random number broadcasted by the bidder node in the blockchain network, where the encrypted random number is obtained by the tenderer node performing homomorphic encryption on the random number by using a homomorphic encryption public key of the tenderer node.
At the time of opening the bid, the bidder node a may broadcast an encrypted random number in the blockchain network, where the encrypted random number is obtained by homomorphically encrypting the random number Rand by the bidder node a using the homomorphic encryption public key of the bidder node.
And step 304, the node of the sending party decrypts the third encrypted information by adopting the homomorphic encryption private key of the node of the sending party to obtain a decryption result.
When the tender party node receives the bidding information signed by the private key of the tender party node A, the tender party node verifies the private key signature of the tender party node A, and after the verification is passed, the tender party node decrypts the third encrypted information Psumb by adopting the homomorphic encrypted private key of the tender party node A to obtain a decryption result.
And 305, the sending party node decrypts the encrypted random number by adopting a homomorphic encryption private key of the sending party node to obtain the random number.
The node of the sending side can also decrypt the encrypted random number by adopting a homomorphic encryption private key of the node of the sending side to obtain the random number Rand.
Step 306, the originator node calculates the difference between the decryption result and the random number.
And the transmitting party node calculates the difference value between the decryption result and the random number, and the difference value is recorded as Psuml.
And 307, the tenderer node adopts the homomorphic encryption public key of the bidder node to homomorphically encrypt the random number to obtain fourth encryption information.
And the sending party node adopts the homomorphic encryption public key of the bidder node A to homomorphically encrypt the random number Rand to obtain Randa, and the Randa is recorded as fourth encryption information.
And 308, the caller node obtains a homomorphic encrypted first result corresponding to the quotation information of each component in the multiple components according to the multiple first encryption information and the fourth encryption information.
And the beacon side node takes the difference obtained by subtracting Randa from P1a as a homomorphic encrypted result P1aa corresponding to P1, the beacon side node takes the difference obtained by subtracting Randa from P2a as homomorphic encrypted results P2aa and P … corresponding to P2, and the beacon side node takes the difference obtained by subtracting Randa from Pna as a homomorphic encrypted result Pnaa corresponding to Pn. Here, P1aa, P2aa, …, Pnaa are described as the first result.
And 309, the node of the sending party obtains a homomorphic encrypted second result corresponding to the total quotation information of the plurality of components according to the second encryption information and the fourth encryption information.
And the sending standard node takes the difference obtained by subtracting Randa from Psuma as the result Psumaa after homomorphic encryption corresponding to Psum, and the Psumaa is taken as a second result.
And step 310, when the tenderer node determines that the sum of the homomorphic encrypted first results corresponding to the quotation information of each component in the plurality of components is equal to the second result, homomorphic encryption public keys of the tenderer node are adopted to homomorphic encrypt the difference value to obtain fifth encrypted information.
Further, the prover node verifies whether Psumaa is correct according to the number of components in a homomorphic manner, that is, the prover node needs to verify whether P1aa + P2aa + … + Pnaa is equal to Psumaa. If the encryption key is correct, the sending party node further adopts the homomorphic encryption public key of the bidder node A to homomorphically encrypt Psuml to obtain fifth encryption information. Further, it was verified whether the fifth confidential information and Psumaa are the same.
And 311, when the tenderer node determines that the fifth cryptographic information is the same as the second result, the tenderer node determines that the bidder node is verified.
And if the tenderer node determines that the fifth confidential information is the same as the Psumaa, the tenderer node determines that the bidder node A passes verification. Similarly, the bidder node may verify the bidder node B using a method similar to that described in the present embodiment.
Optionally, the method further includes: when the bidder node is determined to be a successful bidder node by the sponsor node, broadcasting the identification information of the bidder node, the second encryption information and the third encryption information in the block chain network by the sponsor node.
For example, after the bidder node a and the bidder node B are comprehensively compared by the bidder node, and the bidder node a is determined to be the successful bidder node, the successful bidder node may also broadcast the relevant information of the successful bidder node in the block chain network, for example, the successful bidder node broadcasts the identification information of the successful bidder node a, the second encryption information Psuma, and the third encryption information Psumb in the block chain network. Optionally, the target sending node may first sign the relevant information of the target node by using its own block chain private key, and further, broadcast the signed relevant information of the target node in the block chain network.
Optionally, after receiving the information related to the winning bidder node, the accounting node in the blockchain network performs a fund transfer according to the second encryption information Psuma and the third encryption information Psumb, for example, the accounting node may subtract from the account of the originating bidder node (Psumb-Randa) and add from the account of the bidder node (Psuma-Randa) by homomorphic encryption.
It can be understood that, when the bidding is finished, the tenderer and the bidder enter the bidding document execution phase. If the tenderer declares that the amount of the bid is not consistent with the bidder, the bid guarantee amount T is directly transferred to the bidder. The bidding process terminates.
According to the embodiment of the invention, the accounting node processes the money of each bid transaction under the condition of homomorphic encryption under the condition of protecting the privacy of the tenderer and the bidder, so that the normal performance and the safety of the bid are guaranteed.
Fig. 4 is a schematic structural diagram of a bidder node according to an embodiment of the present invention. The bidder node provided in the embodiment of the present invention may execute the processing flow provided in the embodiment of the block chain-based electronic bidding method, and as shown in fig. 4, the bidder node 40 includes: memory 41, processor 42, computer programs and communication interface 43; wherein the computer program is stored in the memory 41 and is configured to be executed by the processor 42 for: receiving an electronic bid, which includes information of a plurality of components to be bid, broadcast by a sponsor node in a blockchain network through a communication interface 43; adopting the homomorphic encryption public key of the bidder node to homomorphic encrypt the quotation information and the random number of each component in the plurality of components to obtain a plurality of first encryption information; adopting a homomorphic encryption public key of the bidder node to homomorphically encrypt the total quotation information and the random numbers of the components to obtain second encryption information; carrying out homomorphic encryption on the total quotation information and the random numbers of the multiple components by adopting a homomorphic encryption public key of the node of the sender to obtain third encryption information; broadcasting the plurality of first encrypted information, the second encrypted information, and the third encrypted information in the blockchain network through a communication interface 43; wherein the blockchain network includes the bidder node and the sponsor node.
Optionally, the broadcasting, by the processor 42, the plurality of first encryption information, the plurality of second encryption information, and the plurality of third encryption information in the blockchain network through the communication interface 43 includes: and broadcasting bid information in the blockchain network through the communication interface 43, wherein the bid information comprises the plurality of first encrypted information, the second encrypted information and the third encrypted information.
Optionally, before the processor 42 broadcasts the bid information in the blockchain network through the communication interface 43, the processor is further configured to: signing the bidding information by adopting a block chain private key of the bidder node to obtain signed bidding information; when the processor 42 broadcasts the bid information in the blockchain network through the communication interface 43, it is specifically configured to: the signed bid information is broadcast in the blockchain network via communication interface 43.
The bidder node of the embodiment shown in fig. 4 may be used to implement the technical solutions of the above method embodiments, and the implementation principles and technical effects thereof are similar and will not be described herein again.
Fig. 5 is a schematic structural diagram of a node of a sending target according to an embodiment of the present invention. The tenderer node provided in the embodiment of the present invention may execute the processing flow provided in the embodiment of the block chain-based electronic bidding method, and as shown in fig. 5, the tenderer node 50 includes: memory 51, processor 52, computer programs and communication interface 53; wherein the computer program is stored in the memory 51 and is configured to be executed by the processor 52 for: broadcasting an electronic bidding document in the blockchain network through the communication interface 53, the electronic bidding document including information of the plurality of components being bid on; receiving a plurality of first encrypted information, second encrypted information and third encrypted information, which are broadcasted by the bidder node in the blockchain network, through a communication interface 53, wherein the plurality of first encrypted information is obtained by the bidder node performing homomorphic encryption on the quotation information and the random number of each of the plurality of components by using a homomorphic encryption public key of the bidder node, the second encrypted information is obtained by the bidder node performing homomorphic encryption on the total quotation information and the random number of the plurality of components by using a homomorphic encryption public key of the bidder node, and the third encrypted information is obtained by the bidder node performing homomorphic encryption on the total quotation information and the random number of the plurality of components by using a homomorphic encryption public key of the bidder node; receiving an encrypted random number broadcasted by the bidder node in the block chain network through a communication interface 53, wherein the encrypted random number is obtained by homomorphically encrypting the random number by the bidder node by adopting a homomorphic encryption public key of the sponsor node; decrypting the third encrypted information by adopting a homomorphic encryption private key of the sender node to obtain a decryption result; decrypting the encrypted random number by adopting a homomorphic encryption private key of the node of the sending party to obtain the random number; calculating a difference between the decryption result and the random number; homomorphic encryption is carried out on the random number by adopting a homomorphic encryption public key of the bidder node to obtain fourth encryption information; according to the first encryption information and the fourth encryption information, obtaining a homomorphic encrypted first result corresponding to the quotation information of each part in the parts; obtaining homomorphic encrypted second results corresponding to the overall quotation information of the plurality of components according to the second encryption information and the fourth encryption information; when the tenderer node determines that the sum of homomorphic encrypted first results corresponding to the quotation information of each component in the plurality of components is equal to the second result, homomorphic encryption public keys of the tenderer node are adopted to homomorphic encrypt the difference values to obtain fifth encrypted information; when the tenderer node determines that the fifth cryptographic information is the same as the second result, the tenderer node determines that the bidder node is verified.
Optionally, the processor 52 is further configured to: when the bidder node is determined to be a successful bidder node by the tenderer node, broadcasting the identification information, the second encryption information and the third encryption information of the tenderer node in the block chain network through a communication interface 53.
The signaling node in the embodiment shown in fig. 5 may be used to implement the technical solution of the above method embodiment, and the implementation principle and technical effect are similar, which are not described herein again.
In addition, the embodiment of the present invention also provides a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the block chain-based electronic bidding method described in the above embodiment.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device) or a processor (processor) to execute some steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
It is obvious to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional modules is merely used as an example, and in practical applications, the above function distribution may be performed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to perform all or part of the above described functions. For the specific working process of the device described above, reference may be made to the corresponding process in the foregoing method embodiment, which is not described herein again.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (11)
1. A method for electronic bidding based on a block chain, comprising:
the bidder node receiving an electronic bid broadcasted by the bidder node in the blockchain network, the electronic bid including information of a plurality of components to be bid;
the bidder node adopts the homomorphic encryption public key of the bidder node to homomorphic encrypt the quotation information and the random number of each component in the plurality of components to obtain a plurality of first encryption information;
the bidder node performs homomorphic encryption on the total quotation information and the random numbers of the components by adopting a homomorphic encryption public key of the bidder node to obtain second encryption information;
the bidder node performs homomorphic encryption on the total quotation information and the random numbers of the multiple components by adopting a homomorphic encryption public key of the sponsor node to obtain third encryption information;
the bidder node broadcasting the plurality of first, second, and third encrypted information in the blockchain network;
wherein the blockchain network includes the bidder node and the sponsor node.
2. The method of claim 1, wherein the bidder node broadcasting the plurality of first, second, and third encrypted information in the blockchain network comprises:
the bidder node broadcasts bidding information in the blockchain network, the bidding information including the plurality of first encrypted information, the second encrypted information, and the third encrypted information.
3. The method of claim 2, wherein the bidder node prior to broadcasting bid information in the blockchain network, the method further comprises:
the bidder node signs the bidding information by adopting a block chain private key of the bidder node to obtain signed bidding information;
the bidder node broadcasting bid information in the blockchain network, comprising:
and the bidder node broadcasts the signed bid information in the block chain network.
4. A method for electronic bidding based on a block chain, comprising:
a sponsor node broadcasting an electronic bid in a blockchain network, the electronic bid including information for a plurality of components being bid on;
the method comprises the steps that a plurality of first encryption information, second encryption information and third encryption information which are broadcasted by a bidder node in a block chain network are received by the bidder node, wherein the first encryption information is obtained by performing homomorphic encryption on quotation information and a random number of each component in a plurality of components by the bidder node by using a homomorphic encryption public key of the bidder node, the second encryption information is obtained by performing homomorphic encryption on total quotation information and the random number of the components by the bidder node by using a homomorphic encryption public key of the bidder node, and the third encryption information is obtained by performing homomorphic encryption on the total quotation information and the random number of the components by the bidder node by using a homomorphic encryption public key of the bidder node;
the tenderer node receives an encrypted random number broadcasted by the bidder node in the block chain network, wherein the encrypted random number is obtained by homomorphically encrypting the random number by the tenderer node by adopting a homomorphic encryption public key of the tenderer node;
the sending party node decrypts the third encrypted information by adopting a homomorphic encryption private key of the sending party node to obtain a decryption result;
the sending party node decrypts the encrypted random number by adopting a homomorphic encryption private key of the sending party node to obtain the random number;
the transmitting party node calculates the difference value between the decryption result and the random number;
the tenderer node adopts the homomorphic encryption public key of the bidder node to homomorphically encrypt the random number to obtain fourth encryption information;
the sending party node obtains a homomorphic encrypted first result corresponding to the quotation information of each component in the multiple components according to the multiple first encryption information and the fourth encryption information;
the sending party node obtains a homomorphic encrypted second result corresponding to the total quotation information of the plurality of components according to the second encryption information and the fourth encryption information;
when the tenderer node determines that the sum of homomorphic encrypted first results corresponding to the quotation information of each component in the plurality of components is equal to the second result, homomorphic encryption public keys of the tenderer node are adopted to homomorphic encrypt the difference values to obtain fifth encrypted information;
when the tenderer node determines that the fifth cryptographic information is the same as the second result, the tenderer node determines that the bidder node is verified.
5. The method of claim 4, further comprising:
when the bidder node is determined to be a successful bidder node by the sponsor node, broadcasting the identification information of the bidder node, the second encryption information and the third encryption information in the block chain network by the sponsor node.
6. A bidder node, comprising:
a memory;
a processor;
a communication interface; and
a computer program;
wherein the computer program is stored in the memory and configured to be executed by the processor to:
receiving an electronic bidding document broadcasted by a sponsor node in a blockchain network through the communication interface, wherein the electronic bidding document comprises information of a plurality of bidding components;
adopting the homomorphic encryption public key of the bidder node to homomorphic encrypt the quotation information and the random number of each component in the plurality of components to obtain a plurality of first encryption information;
adopting a homomorphic encryption public key of the bidder node to homomorphically encrypt the total quotation information and the random numbers of the components to obtain second encryption information;
carrying out homomorphic encryption on the total quotation information and the random numbers of the multiple components by adopting a homomorphic encryption public key of the node of the sender to obtain third encryption information;
broadcasting the plurality of first encrypted information, the second encrypted information, and the third encrypted information in the blockchain network through the communication interface;
wherein the blockchain network includes the bidder node and the sponsor node.
7. The bidder node of claim 6, wherein the processor broadcasts the plurality of first, second and third encrypted information in the blockchain network via the communication interface, comprising:
and broadcasting bidding information in the block chain network through the communication interface, wherein the bidding information comprises the plurality of first encryption information, the second encryption information and the third encryption information.
8. The bidder node of claim 7, wherein prior to broadcasting bid information in the blockchain network via the communication interface, the processor is further configured to:
signing the bidding information by adopting a block chain private key of the bidder node to obtain signed bidding information;
the processor is specifically configured to, when broadcasting the bid information in the block chain network through the communication interface:
and broadcasting the signed bid information in the block chain network through the communication interface.
9. A sponsor node, comprising:
a memory;
a processor;
a communication interface; and
a computer program;
wherein the computer program is stored in the memory and configured to be executed by the processor to:
broadcasting an electronic bidding document in a blockchain network through the communication interface, the electronic bidding document including information of a plurality of components to be bid on;
receiving a plurality of first encryption information, second encryption information and third encryption information broadcasted by the bidder node in the blockchain network through the communication interface, wherein the plurality of first encryption information is obtained by the bidder node performing homomorphic encryption on quotation information and a random number of each of the plurality of components by using a homomorphic encryption public key of the bidder node, the second encryption information is obtained by the bidder node performing homomorphic encryption on total quotation information and the random number of the plurality of components by using the homomorphic encryption public key of the bidder node, and the third encryption information is obtained by the bidder node performing homomorphic encryption on the total quotation information and the random number of the plurality of components by using the homomorphic encryption public key of the bidder node;
receiving an encrypted random number broadcasted by the bidder node in the block chain network through the communication interface, wherein the encrypted random number is obtained by homomorphically encrypting the random number by the bidder node by adopting a homomorphic encryption public key of the sponsor node;
decrypting the third encrypted information by adopting a homomorphic encryption private key of the sender node to obtain a decryption result;
decrypting the encrypted random number by adopting a homomorphic encryption private key of the node of the sending party to obtain the random number;
calculating a difference between the decryption result and the random number;
homomorphic encryption is carried out on the random number by adopting a homomorphic encryption public key of the bidder node to obtain fourth encryption information;
according to the first encryption information and the fourth encryption information, obtaining a homomorphic encrypted first result corresponding to the quotation information of each part in the parts;
obtaining homomorphic encrypted second results corresponding to the overall quotation information of the plurality of components according to the second encryption information and the fourth encryption information;
when the tenderer node determines that the sum of homomorphic encrypted first results corresponding to the quotation information of each component in the plurality of components is equal to the second result, homomorphic encryption public keys of the tenderer node are adopted to homomorphic encrypt the difference values to obtain fifth encrypted information;
when the tenderer node determines that the fifth cryptographic information is the same as the second result, the tenderer node determines that the bidder node is verified.
10. The originator node of claim 9, wherein the processor is further configured to:
and when the bidder node is determined to be the successful bidder node by the tenderer node, broadcasting the identification information, the second encryption information and the third encryption information of the tenderer node in the block chain network through the communication interface.
11. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the method according to any one of claims 1-5.
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