CN110868286A - Method for generating random number based on block chain intelligent contract - Google Patents
Method for generating random number based on block chain intelligent contract Download PDFInfo
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- 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
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Abstract
The invention discloses a method for generating random numbers based on a block chain intelligent contract. The method comprises the following steps: each participant generates a random number, hash operation is carried out on the random number through a pre-published hash algorithm, and a hash value is taken and written into a block chain through an intelligent contract; writing a random number plaintext of a random number into a block chain publication; carrying out hash operation on random numbers published by other participants through a pre-published hash algorithm, verifying whether a hash value of the random number of each other participant after the hash operation is valid or not, and verifying that the participant passing the verification is a valid participant; the random numbers of all active participants are combined and a consensus random number is generated using a pre-published random number algorithm. The invention distributes 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 effectiveness, and finally realizes the consensus of the random numbers through a unified algorithm.
Description
Technical Field
The invention relates to the technical field of block chains, in particular to a method for generating random numbers based on a block chain intelligent contract.
Background
The block chain technology is increasingly widely applied to various fields such as finance, banks and the like. The blockchain technology is a brand new distributed infrastructure and computing paradigm that uses blockchain data structures to verify and store data, uses a distributed node consensus algorithm to generate and update data, uses cryptography to ensure the security of data transmission and access, and uses intelligent contracts composed of automated script codes to program and operate data.
Random number generation has wide application in many fields, but due to the characteristics of distributed and decentralized block chains, random number consensus among multiple participants is a problem which is difficult to solve. The traditional random number generation methods have different disadvantages, for example, a random number generation algorithm of block hash or block time is easy to be operated by a block node, and a certain submitted value is easy to be cracked by calculating a certain black box algorithm. There is therefore a need for an efficient random number generation method to serve practical applications.
Disclosure of Invention
The invention aims to provide a method for generating random numbers based on a block chain intelligent contract, which distributes random number hash values and random number plaintext of each participant to a block chain in different stages through the intelligent contract, verifies the effectiveness of the random numbers through hash operation, and finally realizes consensus of the random numbers through a unified algorithm.
In order to achieve the above object, the present invention provides a method for generating random numbers based on a block chain intelligent contract, comprising:
step 1: pre-publishing a hash algorithm and a random number algorithm for generating a consensus random number in a block chain;
step 2: in a first time period, each participant generates a random number, each participant performs hash operation on the random number through a pre-published hash algorithm and takes a hash value of the random number, and the hash value is written into a block chain through an intelligent contract;
and step 3: in a second time period, each participant writes the random number plaintext of the random number into a block chain for publication;
and 4, step 4: in a third time period, each participant performs hash operation on the random numbers published by other participants through the hash algorithm published in advance, each participant verifies whether the hash value of the random numbers of other participants after the hash operation is valid or not, and the participant passing the verification is a valid participant;
and 5: and combining the random numbers of all the effective participants and generating 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 the consensus random number in the blockchain, the hash algorithm employs one of MD5 algorithm and SHA-2 series algorithm.
Preferably, each participant generates a random number, performs hash operation on the random number through the hash algorithm published in advance and takes a hash value of the random number, and writes the hash value into a blockchain step through an intelligent contract, where the participants are blockchain users participating in the same application scenario together.
Preferably, each participant generates a random number, each participant performs hash operation on the random number through a pre-published hash algorithm and takes a hash value of the random number, and the hash value is written into a block chain step through an intelligent contract, the participants perform 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 performs hash operation on the random number through the pre-published hash algorithm and takes a hash value of the random number, and the hash value is written into a block chain step through an intelligent contract, wherein the random number plaintext of each participant cannot be acquired by any other participant at this stage.
Preferably, each participant generates a random number, each participant performs hash operation on the random number through the hash algorithm published in advance and takes a hash value of the random number, the hash value is written into the blockchain step through an intelligent contract, and the hash value published by each participant is recorded into the blockchain ledger through the intelligent contract.
Preferably, a random number is generated at each participant, each participant performs hash operation on the random number through the hash algorithm published in advance and takes a hash value of the random number, the hash value is written into a blockchain step through an intelligent contract, the hash value recorded in the blockchain ledger is public and can not be changed, and each participant can acquire the hash values of all participants from the blockchain ledger.
Preferably, in the step of each participant performing hash operation on the random numbers published by the other participants through the hash algorithm published in advance, each participant verifying whether the hash value of the random number of each other participant after the hash operation is valid, and verifying the participants passing the verification as valid participants, each participant performs hash operation on all the published random number texts one by one through the hash algorithm.
Preferably, each participant performs hash operation on the random numbers published by the other participants through the hash algorithm published in advance, each participant verifies whether the hash value of the random number of each other participant after the hash operation is valid, and in the step of verifying the participant passing through as a valid participant, the hash value of each random number after the plaintext hash operation is extracted.
Preferably, in the step of each participant performing hash operation on the random numbers published by the other participants through the hash algorithm published in advance, each participant verifies whether the hash value of the random number of each other participant after the hash operation is valid, and in the step of verifying that the participant passing through is a valid participant, the step of verifying that the hash value in the plaintext of each random number is consistent with the hash value published in advance is compared to verify whether the hash value in the plaintext of each random number 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 participants who are inconsistent and do not publish the plaintext of random numbers are regarded as automatically canceling participation qualification and giving penalty measures.
The invention has the beneficial effects that: in the invention, each participant publishes the hash value of each random number to the block chain in the first stage, then publishes the plaintext of each random number to the block chain in the second stage, and each participant carries out hash operation on the plaintext of the random number to carry out validity verification in the third stage, and combines all the verified effective random numbers to form the consensus random number.
The apparatus 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 above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, wherein like reference numerals generally represent like parts in exemplary embodiments of the present invention.
Fig. 1 shows a flow chart of the steps of a method of generating random numbers based on a blockchain intelligent contract according to the invention.
FIG. 2 is a flow diagram illustrating steps of a method for generating random numbers based on blockchain intelligent contracts, according to one embodiment of the 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 shown 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 shows a flow chart of the steps of a method of generating random numbers based on a blockchain intelligent contract according to the invention.
As shown in fig. 1, a method for generating random numbers based on a block chain intelligent contract according to the present invention includes:
step 1: pre-publishing a hash algorithm and a random number algorithm for generating a consensus random number in a block chain;
step 2: in a first time period, each participant generates a random number, each participant performs hash operation on the random number through a pre-published hash algorithm and takes a hash value of the random number, and the hash value is written into a block chain through an intelligent contract;
and step 3: in a second time period, each participant writes the random number plaintext of the random number into a block chain for publication;
and 4, step 4: in a third time period, each participant performs hash operation on the random numbers published by other participants through a pre-published hash algorithm, each participant verifies whether the hash value of the random numbers of other participants after the hash operation is valid or not, and the participant passing the verification is a valid participant;
and 5: the random numbers of all active participants are combined and a consensus random number for all active participants is generated using a pre-published random number algorithm.
In one example, in the step of prepublishing the hash algorithm in the blockchain and the random number algorithm for generating the consensus random number, the hash algorithm should be a hash algorithm with certain strength, the hash algorithm can be an MD5 algorithm or an SHA-2 series algorithm, such as SHA-224, SHA-256, SHA-384, SHA-512, and all participants use a predefined unified hash algorithm.
In one example, each participant generates a random number, performs 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 blockchain step through an intelligent contract, where the participants are blockchain users who participate in the same application scenario together.
In one example, each participant generates a random number, each participant performs 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 block chain step through an intelligent contract, data interaction is performed between the participants through the intelligent contract, and the intelligent contract is provided with business logic between the participants.
In particular, the intelligent contracts based on the block chain comprise a transaction processing and saving mechanism and a complete state machine, wherein various intelligent contracts are accepted and processed, and the saving and the state processing of the transactions are completed on the block chain. The transaction mainly comprises data needing to be sent; and events are descriptive information of such data. After the transaction and event information is transmitted into the intelligent contract, the resource state in the contract resource set is updated, and the intelligent contract is triggered to judge the state machine. And if the trigger conditions of a certain action or certain actions in the automatic state machine are met, selecting contract actions to be automatically executed by the state machine according to preset information. An intelligent contract is a set of commitments defined in a digital form, and comprises an agreement on which a contract participant can execute the commitments, namely, the intelligent contract is an agreement which can automatically execute some manual tasks and can complete tasks, and is equivalent to constructing a contract which is readable by all the participants in a computer system, and the contract is executed immediately as long as some event is triggered.
In one example, a random number is generated at each participant, each participant performs hash operation on the random number through a pre-published hash algorithm and takes a hash value of the random number, and the hash value is written into a block chain step through an intelligent contract, wherein the plaintext of the random number of each participant cannot be acquired by any other participant at this stage.
In one example, each participant generates a random number, each participant performs 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 the blockchain step through an intelligent contract, and the hash value published by each participant is recorded into the blockchain ledger through the intelligent contract.
In one example, a random number is generated at each participant, each participant performs 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 the blockchain step through an intelligent contract, the hash value recorded in the blockchain account book is public and can not be changed, and each participant can acquire the hash values of all participants from the blockchain account book.
In one example, in the step that each participant performs hash operation on the random numbers published by other participants through a pre-published hash algorithm, and each participant verifies whether the hash value of the hash operation of the random numbers of other participants is valid, the participant who passes the verification is a valid participant, and each participant performs hash operation on all the published random number plaintext one by one through the hash algorithm.
In one example, in the step that each participant performs hash operation on the random numbers published by other participants through a pre-published hash algorithm, and each participant verifies whether the hash value of the random number of each other participant after the hash operation is valid, the participant who passes the verification is a valid participant, and the hash value of each random number after the hash operation is extracted.
In one example, in the step of each participant hashing the random numbers published by the other participants through a pre-published hashing algorithm, each participant verifying whether the hash value after the hashing of the random numbers of the other participants is valid, comparing and verifying whether the hash value in each random number plaintext is consistent with the pre-published hash value, wherein the random number consistent with the pre-published hash value is a valid random number, and the participants who are inconsistent and do not publish the random number plaintext are regarded as automatically canceling participation qualification and giving penalty measures, such as limiting participation or other penalty measures in a period of time, so as to prevent some malicious parties from judging whether the synthesized random number is beneficial to the malicious parties by observing the random numbers published by other parties in the stage, and selectively deciding whether to publish a key to manipulate the random number result.
Example (b):
FIG. 2 is a flow diagram illustrating steps of a method for generating random numbers based on blockchain intelligent contracts, according to one embodiment of the invention.
As shown in fig. 2, a method for generating random numbers based on a blockchain intelligent contract according to the present invention includes:
step 1: pre-publishing a hash algorithm and a random number algorithm for generating a consensus random number in a blockchain, wherein the hash algorithm adopts one of an MD5 algorithm and an SHA-2 series algorithm;
step 2: in a first time stage, a plurality of block chain users jointly participate in the same application scene, each participant generates a random number, each participant performs hash operation on the random number through a pre-published hash algorithm and obtains a hash value of the random number, the hash value is written into a block chain through an intelligent contract, data interaction is performed between the participants through the intelligent contract, the intelligent contract is provided with business logic among the participants, the hash value issued by each participant is recorded into a block chain account book through the intelligent contract, the hash value recorded in the block chain account book is public and can not be changed, each participant can obtain the hash value of all the participants from the block chain account book, and the random number of each participant cannot be obtained by any other participant in the plaintext at the stage;
and step 3: in a second time period, each participant writes the random number plaintext of the random number into a block chain for publication;
and 4, step 4: in the third time stage, each participant performs hash operation on the random numbers published by other participants through a pre-published hash algorithm, each participant verifies whether the hash value of the random number of each other participant after hash operation is valid or not, the participant passing the verification is a valid participant, each participant performs hash operation on all the published random number plain texts one by one through the hash algorithm, the hash value of each random number plain text after hash operation is extracted, the comparison result shows whether the hash value of each random number plain text is consistent with the pre-published hash value or not, the random number consistent with the pre-published hash value is a valid random number, the participants inconsistent with the random number plain texts and not publishing random number plain texts are regarded as automatic participation eligibility cancellation and a penalty measure is given to prevent some malicious participants from judging whether the synthesized random numbers are beneficial to themselves by observing the random numbers published by other participants in the current stage, thereby selectively deciding whether to publish the key to manipulate the random number result;
and 5: the random numbers of all active participants are combined and a consensus random number for all active participants is generated using a pre-published random number algorithm.
In the embodiment, each participant publishes the hash value of each random number to the block chain in the first stage, then publishes the plaintext of each random number to the block chain in the second stage, and each participant performs hash operation on the plaintext of the random number to verify the validity in the third stage, and finally combines all the verified and valid random numbers to form the consensus random number, so that the characteristic that the data of the block chain cannot be tampered is fully utilized, and data interaction is performed through an intelligent contract.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not 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 described embodiments.
Claims (10)
1. A method for generating random numbers based on a blockchain intelligent contract, comprising:
step 1: pre-publishing a hash algorithm and a random number algorithm for generating a consensus random number in a block chain;
step 2: in a first time period, each participant generates a random number, each participant performs hash operation on the random number through a pre-published hash algorithm and takes a hash value of the random number, and the hash value is written into a block chain through an intelligent contract;
and step 3: in a second time period, each participant writes the random number plaintext of the random number into a block chain for publication;
and 4, step 4: in a third time period, each participant performs hash operation on the random numbers published by other participants through the hash algorithm published in advance, each participant verifies whether the hash value of the random numbers of other participants after the hash operation is valid or not, and the participant passing the verification is a valid participant;
and 5: and combining the random numbers of all the effective participants and generating 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 the block chain intelligent contract according to claim 1, wherein the step 1 further comprises:
the hash algorithm adopts one of MD5 algorithm and SHA-2 series algorithm.
3. The method for generating random numbers based on block chain intelligent contracts according to claim 1, wherein the step 2 further comprises:
the participants are blockchain users who participate in the same application scene together.
4. The method for generating random numbers based on a block chain intelligent contract according to claim 1, wherein the step 2 further comprises:
and data interaction is carried out between the participants through the intelligent contract, and the intelligent contract is provided with business logic among the participants.
5. The method for generating random numbers based on the block chain intelligent contract according to claim 1, wherein the step 2 stage is executed to further comprise:
the random number plaintext for each participant cannot be obtained by any other participant at this stage.
6. The method for generating random numbers based on block chain intelligent contracts according to claim 1, wherein the step 2 further comprises:
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 block chain intelligent contracts according to claim 6, wherein the step 2 further comprises:
the hash values recorded in the blockchain ledger are public and unchangeable, and each participant can acquire the hash values of all participants from the blockchain ledger.
8. The method for generating random numbers based on block chain intelligent contracts according to claim 1, wherein the step 4 further comprises:
and each participant carries out hash operation on all published random number plain texts one by one through the hash algorithm.
9. The method for generating random numbers based on block chain intelligent contracts according to claim 8, wherein the step 4 further comprises:
and extracting the hash value of each random number plaintext after hash operation.
10. The method for generating random numbers based on a blockchain intelligent contract according to claim 9, wherein the step 4 further comprises:
and comparing and verifying whether the hash value in each random number plaintext is consistent with a pre-published hash value, wherein the random number consistent with the pre-published hash value is a valid random number, and the participants who are inconsistent and do not publish the random number plaintext are regarded as automatically canceling participation qualification and giving penalty measures.
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| CN110868286B (en) | 2023-05-12 |
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