Threshold group signature method based on public verification of block chain

Abstract

The invention discloses a threshold group signature method based on public verification of a block chain, a trusted center and a threshold group signature system. The scheme comprises the following steps: determining a to-be-signed target message; generating a share signature corresponding to the target message by using the signature member; synthesizing the share signatures of the signature members with the threshold number to obtain a target signature; and storing the target signature, the share signature of the signature member and the identity information of the signature member subjectedto secondary blinding processing into a block chain. Visibly, the scheme can trace back the user identity according to the signature information. In addition, the user identity is subjected to blind processing, so that the user privacy is effectively prevented from being leaked. Finally, the signature information and the blinded user identity information are stored on the block chain, and the block chain has non-revocable and non-tamperable capabilities, so that the third party can be prevented from maliciously tampering the contents, but other participants are allowed to open and verify the information.

Description

technical field [0001] This application relates to the field of information security, in particular to a threshold group signature method, a trusted center and a system based on a blockchain that can be publicly verified. Background technique [0002] E-commerce is a commercial activity that focuses on product exchange technology and has now become a popular form of trade. However, the security situation of e-commerce has been deteriorating. Billions of accounts have been stolen or controlled by hackers. Tens of thousands of user identities were leaked and even traded publicly. [0003] Electronic signature refers to the data existing in electronic form in the message, which is used to indicate that the signer approves the content, and is an important means to ensure information security. However, in the context of e-commerce, existing signature schemes either cannot trace user identities, or cannot guarantee user privacy while achieving public verification, or cannot guara...

AI Technical Summary

Problems solved by technology

[0004] The purpose of this application is to provide a threshold group signature method, trusted center and system based on blockchain that can be publicly verified, to solve the problem that existing signature schemes cannot trace user identities, and cannot achieve public verification. At the same time, the problem of ensuring user privacy

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