CN110865793A - 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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Abstract
The invention discloses a method for generating random numbers based on a block chain intelligent contract. The method comprises the following steps: public identification, an encryption algorithm and a random number algorithm are published in a block chain in advance; each participant generates a random number, encrypts a character string consisting of the random number and a public identification through a pre-published encryption algorithm and writes the character string into a block chain through an intelligent contract; each participant writes the secret key of the encryption algorithm into the block chain for public indication; each participant decrypts the ciphertext of other participants according to the published secret key, and verifies whether the decrypted public identification is valid; and combining the random numbers of all the effective participants and generating consensus random numbers of all the effective participants by using a uniform random number algorithm. The invention distributes the random number ciphertext and the secret key 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 ciphertexts and secret keys of all participants to a block chain in different stages through the intelligent contract, verifies the effectiveness of the random numbers by combining public identifications, 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 public identification, an encryption 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, encrypts a character string consisting of the random number and the public identification through a pre-published encryption algorithm and writes a ciphertext generated by encryption into a block chain through an intelligent contract;
and step 3: in a second time period, each party writes the secret key of the encryption algorithm into a block chain for public indication;
and 4, step 4: in a third time period, each participant decrypts the ciphertext of other participants according to the secret keys published by other participants, each participant verifies whether the decrypted public identification of each participant is valid, and the participant passing the verification is a valid participant;
and 5: and combining the random numbers decrypted by 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 steps of pre-publishing a public identifier, an encryption algorithm and a random number algorithm for generating a consensus random number in the blockchain, the public identifier is a character string with a certain length that can be queried by all participants in the blockchain.
Preferably, in the steps of pre-publishing a public identifier, an encryption algorithm and a random number algorithm for generating a consensus random number in the blockchain, the encryption algorithm selects one of a symmetric encryption algorithm and an asymmetric encryption algorithm.
Preferably, a random number is generated at each participant, each participant encrypts a character string composed of the random number and the public identifier through the pre-published encryption algorithm and writes an encrypted ciphertext generated by encryption into a block chain step through an intelligent contract, and the participants are users of a plurality of block chains participating in the same application scene together.
Preferably, a random number is generated at each participant, each participant encrypts a character string composed of the random number and the public identifier through the pre-published encryption algorithm and writes an encrypted ciphertext generated by encryption 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 service logic between the participants.
Preferably, a random number is generated at each participant, each participant encrypts a character string composed of the random number and the public identifier through the pre-published encryption algorithm and writes an encrypted ciphertext into the block chain step through the smart contract, and the plaintext of the random number of each participant and the key of the encryption algorithm cannot be acquired by any other participant at this stage.
Preferably, a random number is generated at each participant, each participant encrypts a character string composed of the random number and the public identifier through the pre-published encryption algorithm and writes an encrypted ciphertext into a block chain step through an intelligent contract, and the ciphertext issued by each participant is recorded into a block chain ledger through the intelligent contract.
Preferably, in the step that each participant decrypts the ciphertext of each other participant according to the secret key published by the other participant, each participant verifies whether the decrypted public identifier of each other participant is valid, and verifies the passing participant as a valid participant, each participant decrypts all the ciphertext into plaintext by using the published secret key and obtains the random number and the public identifier in the plaintext.
Preferably, in the step that each participant decrypts the ciphertext of each of the other participants according to the key published by the other participants, each participant verifies whether the decrypted public identifier of each of the other participants is valid, and the participant who passes the verification is a valid participant, each plaintext after decryption includes the public identifier and the random number of the corresponding participant.
Preferably, in the step that each participant decrypts the ciphertext of other participants according to the secret keys published by other participants, each participant verifies whether the decrypted public identification of each other participant is valid, and the participant who passes the verification is a valid participant, the step of comparing and verifying whether the public identification in each said plaintext is consistent with the public identification published in advance, the random number in the plaintext consistent with the public identification is a valid random number, and the participants who are inconsistent and have not published the secret keys 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 ciphertext encrypted by combining the random number with the pre-published public identification to the block chain in the first stage, then publishes the secret key to the block chain in the second stage, and in the third stage, each participant decrypts the ciphertext of each other participant according to the secret key and verifies the ciphertext by combining the public identification, and finally combines all verified and 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.
Drawings
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, in which like reference numerals generally represent like parts.
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 public identification, an encryption 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, encrypts a character string consisting of the random number and a public identifier through a pre-published encryption algorithm and writes a ciphertext generated by encryption into a block chain through an intelligent contract;
and step 3: in a second time period, each party writes a secret key of an encryption algorithm into the block chain for public indication;
and 4, step 4: in a third time period, each participant decrypts the ciphertext of other participants according to the secret keys published by other participants, each participant verifies whether the public identification of each decrypted other participant is valid, and the participant passing the verification is a valid participant;
and 5: the random numbers decrypted by 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 steps of pre-publishing a public identity, an encryption algorithm, and a random number algorithm generating a consensus random number in the blockchain, the public identity is a character string with a certain length that can be queried by all participants in the blockchain.
In one example, in the step of pre-publishing the public identity, the encryption algorithm and the random number algorithm generating 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, in the step of generating a random number by each participant, each participant encrypts a character string composed of the random number and a public identifier through a pre-published encryption algorithm and writes a ciphertext generated by the encryption into a block chain through an intelligent contract, the participants are users of a plurality of block chains which participate in the same application scene together.
In one example, a random number is generated at each participant, each participant encrypts a character string consisting of the random number and a public identifier through a pre-published encryption algorithm and writes a ciphertext generated through encryption into a block chain 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.
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, in the step of generating a random number by each participant, encrypting a character string consisting of the random number and a public identifier by a pre-published encryption algorithm by each participant and writing a ciphertext generated by the encryption into the block chain by a smart contract, the plaintext of the random number of each participant and a key of the encryption algorithm cannot be acquired by any other participant at this stage.
In one example, in the step of generating a random number by each participant, each participant encrypts a character string consisting of the random number and a public identifier through a pre-published encryption algorithm and writes a ciphertext generated through encryption into a block chain through an intelligent contract, the ciphertext issued by each participant is recorded into a block chain account book through the intelligent contract.
In one example, in the step that each participant decrypts the ciphertext of other participants according to the secret keys published by the other participants, each participant verifies whether the decrypted public identifier of each other participant is valid, and the participant who passes the verification is the valid participant, each participant decrypts all the ciphertext into plaintext through the published secret key and obtains the random number and the public identifier in the plaintext.
In one example, in the step that each participant decrypts the ciphertext of each other participant according to the key published by the other participant, each participant verifies whether the decrypted public identifier of each other participant is valid, and the participant who passes the verification is a valid participant, each piece of plaintext after decryption comprises the public identifier and the random number of the corresponding participant.
In one example, in the step that each participant decrypts the ciphertext of the other participant according to the key published by the other participant, each participant verifies whether the decrypted public identity of each other participant is valid, and verifies the passing participant as a valid participant, comparing and verifying whether the public identification in each plain text is consistent with the public identification published in advance, wherein the random number in the plain text consistent with the public identification is a valid random number, and the parties who are inconsistent and do not publish the key 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 at 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 includes:
step 1: public identification, an encryption algorithm and a random number algorithm for generating a consensus random number are published in a block chain in advance, the public identification is a character string with a certain length which can be inquired by all participants in the block chain, and the encryption algorithm can select one of a symmetric encryption algorithm and an asymmetric encryption algorithm;
step 2: a plurality of users in a block chain participate in the same application scene together, in a first time period, each participant generates a random number, each participant encrypts a character string consisting of the random number and a public identification through a pre-published encryption algorithm and writes a ciphertext generated through encryption into the block chain through an intelligent contract, data interaction is performed among the participants 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 block chain account book through the intelligent contract, and the plaintext of the random number of each participant and a secret key of the encryption algorithm cannot be acquired by any other participant in the current period;
and step 3: in a second time period, each party writes a secret key of an encryption algorithm into the block chain for public indication;
and 4, step 4: in a third time period, each participant decrypts the ciphertexts of other participants according to the keys published by other participants, each participant decrypts all the ciphertexts into clear by the published keys, each decrypted plaintext comprises a public identification and a random number of the corresponding participant, each participant verifies whether the public identification of each decrypted participant is valid, compares the public identification in each plaintext with the public identification published in advance, verifies that the random number in the plaintext is a valid random number, verifies that the participant passing through is a valid participant, and the participant not passing through and not publishing the keys is regarded as an automatic cancellation participation qualification and gives a penalty measure to prevent some malicious participants from judging whether the synthesized random number is beneficial to themselves by observing the random numbers published by other participants in the third time period, thereby selectively deciding whether to publish the key to manipulate the random number result;
and 5: and 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 finish random number consensus.
In the embodiment, each participant publishes the ciphertext encrypted by combining the random number with the pre-published public identification to the block chain in the first stage, publishes the secret key to the block chain in the second stage, and in the third stage, each participant decrypts the ciphertext of each other participant according to the secret key and verifies the ciphertext by combining the public identification, and finally combines all verified and effective 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 public identification, an encryption 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, encrypts a character string consisting of the random number and the public identification through a pre-published encryption algorithm and writes a ciphertext generated by encryption into a block chain through an intelligent contract;
and step 3: in a second time period, each party writes the secret key of the encryption algorithm into a block chain for public indication;
and 4, step 4: in a third time period, each participant decrypts the ciphertext of other participants according to the secret keys published by other participants, each participant verifies whether the decrypted public identification of each participant is valid, and the participant passing the verification is a valid participant;
and 5: and combining the random numbers decrypted by 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 the block chain intelligent contract according to claim 1, wherein the step 1 further comprises:
the public identifier is a character string with a certain length which can be inquired by all participants in the blockchain.
3. The method for generating random numbers based on the block chain intelligent contract according to claim 1, wherein the step 1 further comprises:
the encryption algorithm selects one of a symmetric encryption algorithm and an asymmetric encryption algorithm.
4. 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 users who participate in a plurality of block chains of the same application scene together.
5. The method for generating random numbers based on block chain intelligent contracts 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.
6. The method for generating random numbers based on block chain intelligent contracts according to claim 1, wherein the step 2 further comprises:
the plaintext of the random number of each participant and the key of the encryption algorithm cannot be obtained by any other participant at this stage.
7. 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 ciphertext issued by each participant into a block chain ledger through the intelligent contract.
8. The method for generating random numbers based on block chain intelligent contracts according to claim 1, wherein the step 4 further comprises:
each participant decrypts all ciphertext into plaintext through the published key and obtains the random number and the public identification in the plaintext.
9. The method for generating random numbers based on block chain intelligent contracts according to claim 8, wherein the step 4 further comprises:
each plaintext after decryption comprises the public identification and the random number of the corresponding participant.
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 public identification in each plain text is consistent with the pre-published public identification, wherein the random number in the plain text consistent with the public identification is a valid random number, and the inconsistent participants without publishing the key are regarded as automatically canceling the participation qualification and giving a penalty measure.
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