CN110868286B - Method for generating random number based on blockchain intelligent contract - Google Patents
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- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/06—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols the encryption apparatus using shift registers or memories for block-wise or stream coding, e.g. DES systems or RC4; Hash functions; Pseudorandom sequence generators
- H04L9/0643—Hash functions, e.g. MD5, SHA, HMAC or f9 MAC
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Abstract
The invention discloses a method for generating random numbers based on a blockchain intelligent contract. Comprising the following steps: each participant generates a random number, hashes the random number through a pre-published hash algorithm, takes the hash value of the random number and writes the hash value into a blockchain through an intelligent contract; writing a random number plaintext of the random number into a blockchain publication; carrying out hash operation on random numbers published by other participants through a pre-published hash algorithm, verifying whether hash values obtained after the hash operation on the random numbers of other participants are valid or not, and verifying that the passed participants are valid participants; the random numbers of all valid parties are combined and a pre-published random number algorithm is used to generate a consensus random number. The invention issues the random number hash value and the random number plaintext 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, wherein random number hash values and random number plaintext of each party are issued to a blockchain in different stages through the intelligent contract, validity of the random numbers is verified through hash operation, 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: a hash algorithm and a random number algorithm for generating a consensus random number are published in the block chain in advance;
step 2: in a first time period, each participant generates a random number, each participant carries out hash operation on the random number through the previously published hash algorithm and takes a hash value of the random number, and the hash value is written into a blockchain through an intelligent contract;
step 3: during a second time period, each participant publishes a random number plaintext of the random number in a blockchain;
step 4: in a third time period, each participant carries out hash operation on the random numbers published by other participants through the hash algorithm published in advance, each participant verifies whether the hash value obtained after the hash operation of the random numbers of other participants is valid or not, and the verified participant is a valid participant;
step 5: combining the random numbers of all the effective participants and generating the consensus random numbers of all the effective participants by using the pre-published random number algorithm.
Preferably, in the step of pre-publishing a hash algorithm and a random number algorithm for generating a consensus random number in the blockchain, the hash algorithm employs one of an MD5 algorithm and a SHA-2 series algorithm.
Preferably, a random number is generated at each participant, each participant carries out hash operation on the random number through the previously published hash algorithm and takes a hash value of the random number, the hash value is written into the blockchain step through the intelligent contract, and the participants are blockchain users which participate in the same application scene together.
Preferably, a random number is generated at each participant, each participant carries out hash operation on the random number through the previously published hash algorithm and takes a hash value of the random number, the hash value is written into a blockchain step through an intelligent contract, the participants carry out data interaction 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 hashes the random number through the pre-published hash algorithm and takes the hash value, the hash value is written into the blockchain through the intelligent contract, and the random number plaintext of each participant cannot be acquired by any other participant at the stage.
Preferably, a random number is generated at each participant, each participant carries out hash operation on the random number through the previously published hash algorithm and takes a hash value of the random number, the hash value is written into a blockchain step through an intelligent contract, and the hash value published by each participant is recorded into a blockchain account book through the intelligent contract.
Preferably, a random number is generated at each participant, each participant carries out hash operation on the random number through the previously published hash algorithm and takes a hash value of the random number, the hash value is written into a blockchain through an intelligent contract, the hash value recorded in the blockchain ledger is public and unchangeable, and each participant can acquire the hash values of all participants from the blockchain ledger.
Preferably, each party carries out hash operation on the random numbers published by other parties through the hash algorithm published in advance, each party verifies whether the hash value obtained after the hash operation on the random numbers of other parties is valid, and in the step that the verified party is a valid party, each party carries out hash operation on all the published random number plaintext one by one through the hash algorithm.
Preferably, each party carries out hash operation on the random numbers published by other parties through the hash algorithm published in advance, each party verifies whether the hash value obtained after the hash operation of the random numbers of other parties is valid, and in the step of verifying that the passed party is a valid party, the hash value obtained after the hash operation of each random number is extracted Wen Haxi.
Preferably, each party carries out hash operation on the random numbers published by other parties through the hash algorithm published in advance, each party verifies whether the hash value obtained after the hash operation of the random numbers of other parties is valid, and in the step of verifying that the party passing through is a valid party, the step of comparing and verifying whether the hash value in each random number plaintext is consistent with the hash value published in advance, the random numbers consistent with the hash value published in advance are valid random numbers, and the parties inconsistent with the random number plaintext which are not published are regarded as automatic disqualification of participation and punishment measures are given.
The beneficial effects of the invention are as follows: in the method, each participant publishes the hash value of the random number to the blockchain in the first stage, publishes the plaintext of the random number to the blockchain in the second stage, carries out validity verification on the plaintext of the random number by each participant in the third stage, combines all the verified valid random numbers to form the consensus random number, is not easy to crack, effectively avoids malicious manipulation of the random number by a certain participant, and effectively solves the problem of random number consensus of a plurality of participants in the blockchain.
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.
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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 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: a hash algorithm and a random number algorithm for generating a consensus random number are published in the block chain in advance;
step 2: in a first time period, each participant generates a random number, and each participant carries out hash operation on the random number through a pre-published hash algorithm and takes a hash value of the random number, and writes the hash value into a block chain through an intelligent contract;
step 3: in a second time period, each participant writes a random number plaintext of the random number into the blockchain publication;
step 4: in a third time period, each participant carries out hash operation on random numbers published by other participants through a pre-published hash algorithm, each participant verifies whether hash values obtained after the hash operation on the random numbers of other participants are valid or not, and the verified participant is a valid participant;
step 5: combining the random numbers of all the valid participants and generating the consensus random numbers of all the valid participants by using a pre-published random number algorithm.
In one example, in the step of pre-publishing the hash algorithm and the random number algorithm for generating the consensus random number in the blockchain, the hash algorithm should be a hash algorithm that is not easy to crack with a certain strength, the hash algorithm may be an MD5 algorithm or SHA-2 series of algorithms, such as SHA-224, SHA-256, SHA-384, SHA-512, and all participants use a predefined unified hash algorithm.
In one example, a random number is generated at each participant, each participant hashes the random number through a pre-published hash algorithm and takes its hash value, and the hash value is written into the blockchain step through an intelligent contract, and the participants are blockchain users that participate in the same application scenario together.
In one example, a random number is generated at each of the participants, each of the participants hashes the random number by a pre-published hash algorithm and takes its hash value, the hash value is written into the blockchain step by an intelligent contract, the participants interact with each other by 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 hashes the random number by a pre-published hash algorithm and takes its hash value, the hash value is written into the blockchain step by an intelligent contract, and the random number plaintext of each party cannot be acquired by any other party at this stage.
In one example, a random number is generated at each participant, each participant hashes the random number by a pre-published hash algorithm and takes its hash value, the hash value is written into the blockchain by an intelligent contract, and the hash value published by each participant is recorded into the blockchain ledger by the intelligent contract.
In one example, a random number is generated at each participant, each participant hashes the random number by a pre-published hash algorithm and takes its hash value, the hash value is written into the blockchain through an intelligent contract, the hash value recorded in the blockchain ledger is public and unchangeable, and each participant can obtain the hash values of all the participants from the blockchain ledger.
In one example, each party hashes the random numbers published by other parties through a pre-published hash algorithm, and in the step of verifying whether the hash value of the random numbers of other parties is valid or not, each party verifies that the passing party is a valid party, and each party hashes all the published random number plaintext one by one through the hash algorithm.
In one example, each party performs hash operation on the random numbers published by other parties through a pre-published hash algorithm, and in the step of verifying whether the hash value obtained after the hash operation of the random numbers of other parties is valid or not, each party verifies that the party passing through is a valid party, and extracts the hash value obtained after the hash operation of each random number name Wen Haxi.
In one example, in the step that each party hashes the random numbers published by other parties through a pre-published hash algorithm, each party verifies whether the hash value of the random numbers of other parties is valid, and compares whether the hash value in each random number plaintext is consistent with the pre-published hash value, the random numbers consistent with the pre-published hash value are valid random numbers, and the parties that are inconsistent and do not publish the random number plaintext are regarded as automatic disqualification and punishment measures, such as limiting participation or other punishment measures in a period of time, so as to prevent some malicious parties from judging whether the synthesized random numbers are beneficial to themselves by observing the random numbers published by other parties in the stage, and thus selectively deciding whether to publish keys to manipulate the random number results.
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 according to the present invention includes:
step 1: a hash algorithm and a random number algorithm for generating a consensus random number are published in advance in a block chain, wherein the hash algorithm adopts one of an MD5 algorithm and an SHA-2 series algorithm;
step 2: in a first time period, a plurality of blockchain users participate in the same application scene together, each participant generates a random number, each participant carries out hash operation on the random number through a pre-published hash algorithm and takes a hash value of the random number, the hash value is written into a blockchain through an intelligent contract, the participants carry out data interaction through the intelligent contract, the intelligent contract is provided with business logic among the participants, the hash value published by each participant is recorded into a blockchain account book through the intelligent contract, the hash value recorded in the blockchain account book is public and can not be changed, each participant can acquire the hash values of all the participants from the blockchain account book, and the random number plaintext of each participant can not be acquired by any other participant in the stage;
step 3: in a second time period, each participant writes a random number plaintext of the random number into the blockchain publication;
step 4: in a third time stage, each party carries out hash operation on random numbers published by other parties through a pre-published hash algorithm, each party verifies whether hash values of random numbers of other parties are valid or not, the verified parties are valid parties, each party carries out hash operation on all published random number plaintext one by one through the hash algorithm, the hash values of each random number plaintext Wen Haxi are extracted, whether the hash values in each random number plaintext are consistent with the pre-published hash values or not is checked, the random numbers consistent with the pre-published hash values are valid random numbers or not is compared, and the parties which are inconsistent and do not publish the random number plaintext are regarded as automatic cancellation of participation qualification and punishment are given to prevent some malicious parties from judging whether the synthesized random numbers are beneficial to themselves or not by observing the random numbers published by other parties in the stage, so that whether keys are published or not is selectively determined to operate the random number results or not;
step 5: combining the random numbers of all the valid participants and generating the consensus random numbers of all the valid participants by using a pre-published random number algorithm.
In the embodiment, each participant publishes the hash value of the random number to the blockchain in the first stage, publishes the plaintext of the random number to the blockchain in the second stage, carries out hash operation on the plaintext of the random number by each participant in the third stage to carry out validity verification, finally combines all the verified valid random numbers to form a common random number, fully utilizes the characteristic that the blockchain data is not tamperable and carries out data interaction through an intelligent contract, is not easy to crack, effectively avoids malicious operation of a certain participant on the random number, and effectively solves the problem of random number common identification 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: a hash algorithm and a random number algorithm for generating a consensus random number are published in the block chain in advance;
step 2: in a first time period, each participant generates a random number, each participant carries out hash operation on the random number through the previously published hash algorithm and takes a hash value of the random number, and the hash value is written into a blockchain through an intelligent contract;
step 3: during a second time period, each participant publishes a random number plaintext of the random number in a blockchain;
step 4: in a third time period, each participant carries out hash operation on the random numbers published by other participants through the hash algorithm published in advance, each participant verifies whether the hash value obtained after the hash operation of the random numbers of other participants is valid or not, and the verified participant is a valid participant;
step 5: combining the random numbers of all the effective participants and generating the consensus 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 hash algorithm adopts one of MD5 algorithm and SHA-2 series algorithm.
3. The method for generating random numbers based on blockchain smart contracts according to claim 1, wherein said step 2 further includes:
the participants are blockchain users who participate in the same application scene together.
4. 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.
5. The method of generating random numbers based on blockchain intelligence contracts of claim 1, further comprising, in performing the step 2 phase:
the random number plaintext for each party is not available to any other party at this stage.
6. The method for generating random numbers based on blockchain smart contracts according to claim 1, wherein said step 2 further includes:
and recording the hash value issued by each participant into a blockchain account book through the intelligent contract.
7. The method for generating random numbers based on blockchain smart contracts of claim 6, wherein the step 2 further includes:
the hash value recorded in the blockchain ledger is public and non-modifiable, and each participant is able to obtain the hash values of all participants from the blockchain ledger.
8. The method for generating random numbers based on blockchain smart contracts according to claim 1, wherein said step 4 further includes:
each party carries out hash operation on all the published random number plaintext one by one through the hash algorithm.
9. The method for generating random numbers based on blockchain smart contracts of claim 8, wherein the step 4 further includes:
and extracting the hash value of each random number after Wen Haxi operation.
10. The method for generating random numbers based on blockchain smart contracts of claim 9, wherein the step 4 further includes:
comparing and verifying whether the hash value in each random number plaintext is consistent with a pre-published hash value, wherein the random numbers consistent with the pre-published hash value are valid random numbers, and participants which are inconsistent and have not published the random number plaintext are regarded as automatically disqualifying participation and giving punishment measures.
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| CN113448541B (en) * | 2020-03-26 | 2023-08-01 | 宏碁股份有限公司 | Block chain random number generation system and block chain random number generation method |
| CN111562902B (en) * | 2020-05-07 | 2023-08-11 | 成都库珀创新科技有限公司 | Block chain-based random number generation method and device |
| CN112764714B (en) * | 2021-01-28 | 2023-10-03 | 上海朝夕网络技术有限公司 | Self-excitation random number generation method based on intelligent contract and terminal equipment |
| US20240146509A1 (en) * | 2021-03-03 | 2024-05-02 | Digital Currency Institute, The People's Bank Of China | Method and Apparatus for Generating Random Number in Blockchain |
| CN112910643B (en) * | 2021-03-03 | 2023-04-07 | 中国人民银行数字货币研究所 | Method and device for generating random number in block chain |
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