Privacy-enhanced ECDSA collaborative signature method and device

Abstract

The invention provides a privacy-enhanced ECDSA collaborative signature method and device, and the method comprises the steps: a first communication party determines a first result of a base point of a target elliptic curve under a first random number and a second result of the base point of the target elliptic curve under a second random number; sending the first result and the second result to a second communication party; receiving a third result and a private key component result sent by the second communication party; and generating a complete signature based on the third result, the private key component result and the message digest. According to the ECDSA collaborative signature method and device with enhanced privacy, the to-be-signed message and the message digest of the to-be-signed message are not sent to the collaborative signature party, so that the problem of privacy leakage in the signature process is solved, and the security in the information transmission process is improved.

Description

technical field [0001] The present application relates to the technical field of information security, in particular, to a privacy-enhanced ECDSA collaborative signature method and device. Background technique [0002] Elliptic Curve Digital Signature Algorithm (ECDSA) is a simulation of Digital Signature Algorithm (DSA) using Elliptic Curve Cryptography (ECC), and its security is based on the intractability of Elliptic Curve Discrete Logarithm Problem (ECDLP). Elliptic curve digital signature algorithm can guarantee the integrity and non-repudiation of information in transmission. The existing elliptic curve digital signature algorithm is an independent signature by an entity. If the private key is only kept by one party, there is often a certain risk of leakage. Once the attacker successfully invades the owner of the private key, the attacker can forge the signature at will. [0003] Using collaborative signature technology can solve the above technical problems. The col...

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Problems solved by technology

[0004] In view of this, the purpose of the embodiment of the present application is to provide a privacy-enhanced ECDSA cooperative signature method, which can not send the message to be signed and the message digest of the message to be signed to the cooperative signer, so as to solve the problems existing in the prior art. The problem of privacy leakage in the process, improve the security of the information transmission process

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