CN110865793B - Method for generating random number based on blockchain intelligent contract - Google Patents
Method for generating random number based on blockchain intelligent contract Download PDFInfo
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- CN110865793B CN110865793B CN201811634051.4A CN201811634051A CN110865793B CN 110865793 B CN110865793 B CN 110865793B CN 201811634051 A CN201811634051 A CN 201811634051A CN 110865793 B CN110865793 B CN 110865793B
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Abstract
The invention discloses a method for generating random numbers based on a blockchain intelligent contract. Comprising the following steps: public identification, encryption algorithm and random number algorithm are published in advance in the block chain; each participant generates a random number, encrypts a character string formed by the random number and a public identifier through a pre-published encryption algorithm and writes the character string into a blockchain through an intelligent contract; each participant writes the secret key of the encryption algorithm into the blockchain for publicizing; each participant decrypts the ciphertext of the other participants according to the published secret key, and verifies whether the decrypted public identifier is valid; combining the random numbers of all the effective participants and generating the consensus random numbers of all the effective participants by using a unified random number algorithm. The invention distributes the random number ciphertext and secret key of each participant to the block chain in different stages through the intelligent contract, verifies the validity and finally realizes the consensus of the random number through a unified algorithm.
Description
Technical Field
The invention relates to the technical field of blockchains, in particular to a method for generating random numbers based on a blockchain intelligent contract.
Background
Blockchain technology is increasingly used in various fields such as finance, banking and the like. The block chain technology is a brand new distributed infrastructure and calculation paradigm for verifying and storing data by using a block chain data structure, generating and updating the data by using a distributed node consensus algorithm, ensuring the safety of data transmission and access by using a cryptography mode, and programming and operating the data by using an intelligent contract consisting of an automatic script code.
Random number generation is widely used in many fields, but because of the self-distributed and decentralised characteristics of the blockchain, the random number consensus among multiple participants is a difficult problem to solve. The conventional random number generation method has different disadvantages, such as that a random number generation algorithm of block hash or block time is easy to be operated by a block-out node, and a certain submitted value is calculated by a certain black box algorithm to be easily cracked. An efficient method of random number generation is therefore needed to serve practical applications.
Disclosure of Invention
The invention aims to provide a method for generating random numbers based on a blockchain intelligent contract, which is characterized in that random number ciphertext and secret keys of all participants are issued to a blockchain in different stages through the intelligent contract, validity of the random numbers is verified by combining a public identifier, and finally consensus of the random numbers is realized through a unified algorithm.
In order to achieve the above object, the present invention provides a method for generating random numbers based on blockchain smart contracts, comprising:
step 1: public identification, encryption algorithm and random number algorithm for generating consensus random number are published in advance in a block chain;
step 2: in a first time period, each participant generates a random number, each participant encrypts a character string formed by the random number and the public identifier through the pre-published encryption algorithm, and a ciphertext generated by encryption is written into a blockchain through an intelligent contract;
step 3: in a second time period, each party writes a secret key of the encryption algorithm into a blockchain for publicizing;
step 4: in a third time period, each participant decrypts the ciphertext of the other participants according to the secret key published by the other participants, and each participant verifies whether the public identifier of each other participant after decryption is valid, and the verified participant is a valid participant;
step 5: combining the random numbers decrypted by all the effective participants and generating common random numbers of all the effective participants by using the pre-published random number algorithm.
Preferably, in the step of pre-publishing public identification, encryption algorithm and random number algorithm for generating consensus random number in the blockchain, the public identification is a character string with a certain length which can be queried by all participants in the blockchain.
Preferably, in the step of pre-publishing public identification, encryption algorithm and random number algorithm for generating consensus random number in the blockchain, the encryption algorithm selects one of symmetric encryption algorithm and asymmetric encryption algorithm.
Preferably, a random number is generated at each participant, each participant encrypts a character string formed by the random number and the public identifier through the pre-published encryption algorithm, and ciphertext generated by encryption is written into the blockchain step through an intelligent contract, wherein the participants are users who participate in a plurality of blockchains of the same application scene together.
Preferably, a random number is generated at each participant, each participant encrypts a character string formed by the random number and the public identifier through the pre-published encryption algorithm, and ciphertext generated by encryption is written into a blockchain through an intelligent contract, the participants interact data through the intelligent contract, and the intelligent contract is provided with business logic among the participants.
Preferably, a random number is generated at each participant, each participant encrypts a character string formed by the random number and the public identifier through the pre-published encryption algorithm, and ciphertext generated by encryption is written into a blockchain step through an intelligent contract, so that the random number plaintext of each participant and the secret key of the encryption algorithm cannot be acquired by any other participant at the stage.
Preferably, a random number is generated at each participant, each participant encrypts a character string formed by the random number and the public identifier through the pre-published encryption algorithm, and ciphertext generated by encryption is written into a blockchain through an intelligent contract, and the ciphertext published by each participant is recorded into a blockchain ledger through the intelligent contract.
Preferably, each party decrypts the ciphertext of the other party according to the secret key published by the other party, each party verifies whether the public identifier of each other party after decryption is valid, and in the step of verifying that the passing party is a valid party, each party decrypts all the ciphertext into plaintext through the published secret key and acquires the random number and the public identifier in the plaintext.
Preferably, each party decrypts the ciphertext of the other party according to the secret key published by the other party, each party verifies whether the public identifier of each other party after decryption is valid, and in the step of verifying that the party passing through is a valid party, each plaintext after decryption comprises the public identifier and the random number of the corresponding party.
Preferably, each party decrypts the ciphertext of the other party according to the secret key published by the other party, each party verifies whether the public identifier of each other party after decryption is valid, and in the step of verifying that the party passing through the verification is a valid party, the step of comparing and verifying whether the public identifier in each plaintext is consistent with the public identifier published in advance, the random number in the plaintext consistent with the public identifier is a valid random number, and the parties which are inconsistent and not publishing the secret key are regarded as automatic cancellation of participation qualification and punishment measures.
The beneficial effects of the invention are as follows: in the method, each participant publishes the ciphertext encrypted by combining the random number and the public identifier published in advance to the blockchain in the first stage, then publishes the secret key to the blockchain in the second stage, decrypts the ciphertext of each other participant according to the secret key and verifies the secret key by combining the public identifier in the third stage, and finally combines all the verified random numbers into the consensus random number.
The device of the present invention has other features and advantages which will be apparent from or are set forth in detail in the accompanying drawings and the following detailed description, which are incorporated herein, and which together serve to explain certain principles of the invention.
Drawings
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular descriptions of exemplary embodiments of the invention as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the invention.
FIG. 1 illustrates a flowchart of the steps of a method for generating random numbers based on blockchain smartcontracts in accordance with the present invention.
FIG. 2 illustrates a flowchart of the steps of a method for generating random numbers based on blockchain smart contracts, in accordance with an embodiment of the present invention.
Detailed Description
The invention will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present invention are illustrated in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
FIG. 1 illustrates a flowchart of the steps of a method for generating random numbers based on blockchain smartcontracts in accordance with the present invention.
As shown in fig. 1, a method for generating random numbers based on a blockchain smart contract according to the present invention includes:
step 1: public identification, encryption algorithm and random number algorithm for generating consensus random number are published in advance in a block chain;
step 2: in a first time period, each participant generates a random number, encrypts a character string formed by the random number and a public identifier through a pre-published encryption algorithm, and writes a ciphertext generated by encryption into a blockchain through an intelligent contract;
step 3: in a second time period, each participant writes a secret key of an encryption algorithm into the blockchain for publicizing;
step 4: in a third time period, each participant decrypts the ciphertext of the other participants according to the secret key published by the other participants, and each participant verifies whether the public identifier of each other participant after decryption is valid, and the verified participant is a valid participant;
step 5: combining the random numbers decrypted by all the effective participants and generating the consensus random numbers of all the effective participants by using a pre-published random number algorithm.
In one example, the public identity is a string of a certain length that all parties in the blockchain can query in a step of pre-publishing public identities, encryption algorithms, and random number algorithms that generate consensus random numbers in the blockchain.
In one example, in the step of pre-publishing the public identity, the encryption algorithm, and the random number algorithm that generates the consensus random number in the blockchain, the encryption algorithm selects one of a symmetric encryption algorithm and an asymmetric encryption algorithm.
In one example, a random number is generated at each participant, each participant encrypts a string composed of the random number and the public identifier through a pre-published encryption algorithm, and the encrypted ciphertext is written into the blockchain step through an intelligent contract, so that the participants are users who participate in a plurality of blockchains of the same application scene together.
In one example, a random number is generated at each participant, each participant encrypts a string of random numbers and public identities through a pre-published encryption algorithm, and cryptographs generated by the encryption are written into a blockchain step through an intelligent contract, wherein data interaction is performed between the participants through the intelligent contract, and the intelligent contract is provided with business logic between the participants.
Specifically, blockchain-based smart contracts include mechanisms for transaction processing and save, and a self-contained state machine for accepting and processing various smart contracts and for transaction save and state processing to be completed on the blockchain. The transaction mainly comprises data to be transmitted; and events are descriptive information of these data. After the transaction and event information is transmitted into the intelligent contract, the resource state in the contract resource set is updated, and then the intelligent contract is triggered to judge the state machine. If the trigger condition of some or several actions in the automatic state machine is met, the contract actions are automatically executed by the state machine according to the preset information. A smart contract is a set of digitally defined commitments, including agreements on which the contract participants can perform these commitments, i.e., a smart contract is a set of agreements that can automatically perform certain manual tasks, equivalent to building a contract in a computer system that is readable by all participants, and that will perform immediately upon triggering of an event.
In one example, a random number is generated at each party, each party encrypts a string of random numbers and public identities by means of a pre-published encryption algorithm and writes the encrypted ciphertext into the blockchain by means of a smart contract, the random number plaintext of each party and the key of the encryption algorithm being such that no other party can obtain at this stage.
In one example, a random number is generated at each participant, each participant encrypts a character string composed of the random number and the public identifier through a pre-published encryption algorithm, the encrypted ciphertext is written into the blockchain through an intelligent contract, and the ciphertext published by each participant is recorded into the blockchain ledger through the intelligent contract.
In one example, each party decrypts the ciphertext of the other party according to the secret key published by the other party, each party verifies whether the public identifier of each other party after decryption is valid, and in the step of verifying that the passing party is a valid party, each party decrypts all the ciphertext into plaintext through the published secret key and acquires the random number and the public identifier in the plaintext.
In one example, each party decrypts the ciphertext of the other party according to the secret key published by the other party, and each party verifies whether the public identifier of each other party after decryption is valid, and in the step of verifying that the party passing through is a valid party, each plaintext after decryption comprises the public identifier and the random number of the corresponding party.
In one example, each party decrypts the ciphertext of the other party according to the secret key published by the other party, each party verifies whether the public identity of each party after decryption is valid, and in the step of verifying that the public identity in each piece of plaintext is a valid party, the random number in the plaintext consistent with the public identity is a valid random number in comparison with whether the public identity in each piece of plaintext is consistent with the public identity, and the parties which are inconsistent and not publishing the secret key are regarded as automatically disqualified and given punishment measures, such as limiting participation or other punishment measures for a period of time, so as to prevent some malicious parties from judging whether the synthesized random number is beneficial to themselves by observing the random numbers published by the other parties in the stage, thereby selectively deciding whether to publish the secret key to manipulate the random number result.
Examples:
FIG. 2 illustrates a flowchart of the steps of a method for generating random numbers based on blockchain smart contracts, in accordance with an embodiment of the present invention.
As shown in fig. 2, a method for generating random numbers based on a blockchain smart contract includes:
step 1: public identification, encryption algorithm and random number algorithm for generating consensus random number are published in advance in the blockchain, wherein the public identification is a character string with a certain length which can be inquired by all participants in the blockchain, and the encryption algorithm can be one of a symmetric encryption algorithm and an asymmetric encryption algorithm;
step 2: a plurality of users in a blockchain participate in the same application scene together, each participant generates a random number in a first time period, each participant encrypts a character string formed by the random number and a public identifier through a pre-published encryption algorithm and writes a ciphertext generated by encryption into the blockchain through an intelligent contract, the participants interact data through the intelligent contract, the intelligent contract is provided with business logic among the participants, the ciphertext issued by each participant is recorded into a blockchain account book through the intelligent contract, and the random number plaintext of each participant and the secret key of the encryption algorithm cannot be acquired by any other participant in the first time period;
step 3: in a second time period, each participant writes a secret key of an encryption algorithm into the blockchain for publicizing;
step 4: in a third time period, each participant decrypts the ciphertext of the other participants according to the secret key published by the other participants, each participant decrypts all the ciphertext into the plaintext through the published secret key, each decrypted plaintext comprises a public identifier and a random number of the corresponding participant, each participant verifies whether the public identifier of each decrypted other participant is valid, compares and verifies whether the public identifier in each plaintext is consistent with the public identifier published in advance, the random number in the plaintext consistent with the public identifier is a valid random number, the participants passing verification are valid participants, and the participants which are inconsistent and do not publish the secret key are regarded as automatic cancellation of participation qualification and give punishment measures so as to prevent some malicious participants from judging whether the synthesized random number is beneficial to themselves by observing the random numbers published by the other participants in the period, thereby selectively deciding whether to publish the secret key to operate the random number result;
step 5: combining the random numbers decrypted by all the effective participants, and generating consensus random numbers of all the effective participants by using a pre-published random number algorithm to complete random number consensus.
In the embodiment, each participant publishes the ciphertext encrypted by combining the random numbers and the public identifiers published in advance to the blockchain in the first stage, publishes the secret keys to the blockchain in the second stage, decrypts the ciphertext of each other participant according to the secret keys and verifies the public identifiers in the third stage, finally combines all the verified effective random numbers to form the consensus random numbers, fully utilizes the characteristic that the blockchain data cannot be tampered and performs data interaction through intelligent contracts, is not easy to crack, effectively avoids malicious manipulation of the random numbers by a certain participant, and effectively solves the problem of random number consensus of a plurality of participants in the blockchain.
The foregoing description of embodiments of the invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described.
Claims (10)
1. A method for generating random numbers based on blockchain smart contracts, comprising:
step 1: public identification, encryption algorithm and random number algorithm for generating consensus random number are published in advance in a block chain;
step 2: in a first time period, each participant generates a random number, each participant encrypts a character string formed by the random number and the public identifier through the pre-published encryption algorithm, and a ciphertext generated by encryption is written into a blockchain through an intelligent contract;
step 3: in a second time period, each party writes a secret key of the encryption algorithm into a blockchain for publicizing;
step 4: in a third time period, each participant decrypts the ciphertext of the other participants according to the secret key published by the other participants, and each participant verifies whether the public identifier of each other participant after decryption is valid, and the verified participant is a valid participant;
step 5: combining the random numbers decrypted by all the effective participants and generating common random numbers of all the effective participants by using the pre-published random number algorithm.
2. The method for generating random numbers based on blockchain smart contracts according to claim 1, wherein said step 1 further includes:
the public identity is a character string with a certain length which can be queried by all participants in the blockchain.
3. The method for generating random numbers based on blockchain smart contracts according to claim 1, wherein said step 1 further includes:
the encryption algorithm is one of a symmetric encryption algorithm and an asymmetric encryption algorithm.
4. The method for generating random numbers based on blockchain smart contracts according to claim 1, wherein said step 2 further includes:
the participants are users who participate in multiple blockchains of the same application scenario together.
5. The method for generating random numbers based on blockchain smart contracts according to claim 1, wherein said step 2 further includes:
and the participants interact data through the intelligent contracts, and the intelligent contracts are provided with business logic among the participants.
6. The method for generating random numbers based on blockchain smart contracts according to claim 1, wherein said step 2 further includes:
the random number plaintext of each party and the key of the encryption algorithm are not made available to any other party at this stage.
7. The method for generating random numbers based on blockchain smart contracts according to claim 1, wherein said step 2 further includes:
and recording the ciphertext issued by each participant into a blockchain ledger through the intelligent contract.
8. The method for generating random numbers based on blockchain smart contracts according to claim 1, wherein said step 4 further includes:
each party decrypts all ciphertext into plaintext through the published secret key and obtains the random number and the public identifier in the plaintext.
9. The method for generating random numbers based on blockchain smart contracts of claim 8, wherein the step 4 further includes:
each decrypted plaintext includes the public identity and a random number of the corresponding party.
10. The method for generating random numbers based on blockchain smart contracts of claim 9, wherein the step 4 further includes:
and comparing and verifying whether the public identifier in each plaintext is consistent with the public identifier published in advance, wherein the random number in the plaintext consistent with the public identifier is a valid random number, and the participants which are inconsistent and have not published the secret key are regarded as automatically disqualifying participation and giving punishment measures.
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| CN111488134B (en) * | 2020-04-09 | 2021-04-27 | 堡垒科技有限公司 | Public random number generation method and device based on block chain |
| CN113240123B (en) * | 2021-07-13 | 2021-11-19 | 深圳市永达电子信息股份有限公司 | Digital quantum bit preparation method, system, computer and readable storage medium |
| CN114785516B (en) * | 2022-03-31 | 2024-04-05 | 浙江数秦科技有限公司 | Time-limited encryption and decryption system based on block chain |
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