Secret sharing method and apparatus based on block chain system

Abstract

The invention relates to a secret sharing method and apparatus based on a block chain system. The secret sharing method and apparatus based on a block chain system includes the steps: constructing a polynomial by using known secret shares, constructing pseudo sub-shares and verification information by using the polynomial, generating random values according to the secret shares and the pseudo sub-shares, and distributing the pseudo sub-shares, the verification information and the random values to secret participants; waiting for the secret participants to make a commitment protocol on the secret shares in the block chain system, and after all the secret participants complete the commitment protocol, waiting for the secret participants to disclose their respective pseudo sub shares in the block chain system; after the secret participants disclose the pseudo sub-shares, substituting the pseudo sub-shares and the verification information into a set verification equation, and when the verification equation is established, determining that the disclosed pseudo sub-shares to be correct; and after all the pseudo sub-shares are correct, obtaining the shared secret by means of the disclosedpseudo sub-shares and the random values. Therefore, the secret sharing method and apparatus based on a block chain system can avoid the user privacy leakage problem, can guarantee the fairness of secret sharing, and can enhance the security of secret sharing.

Description

technical field [0001] The invention belongs to the technical field of secret sharing, and in particular relates to a secret sharing method and device based on a block chain system. Background technique [0002] Secret sharing is one of the important components in the field of cryptography, and has a wide range of applications in key management, missile control and launch, etc. Secret sharing is an important cornerstone of modern cryptography, which provides higher security protection for the storage and use of sensitive information, and is an important means of information security and data confidentiality. The idea of ​​secret sharing is to split the secret in a certain way, and each sub-share after splitting is owned by different participants, and only several participants can cooperate to recover the secret correctly, so as to prevent the secret from being too centralized and tolerant purpose of the invasion. In 1979, Shamir and Blakley proposed the concept of (t, n) t...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a secret sharing method and device based on the block chain system, which is used to solve the problem of unfair secret sharing caused by the secret sharing method of the prior art relying on the leakage generated by a third party for privacy

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