Method, device and storage medium for cooperative signature based on sm2 algorithm

Abstract

The invention discloses a cooperative signature method, device and storage medium based on the SM2 algorithm, which are used to solve the technical problem that signature messages are easily forged in the prior art. The signature method implemented by the first participant includes: receiving the second elliptic curve random point determined by the second random number sent by the second participant and the second intermediate signature generated by confusing the held second sub-private key; The message digest of the message to be signed and the random point of the second elliptic curve generate the first part of the signature of the message to be signed; when the first part of the signature is determined to be The second intermediate signature generates the first intermediate signature; the first partial signature and the first intermediate signature are sent to the second participant, so that the second participant can generate the second part of the message to be signed based on the second sub-private key and the first intermediate signature Signature to form a complete signature of the message to be signed by the first part of the signature and the second part of the signature.

Description

technical field [0001] The invention relates to the fields of information security and cryptography, in particular to a method, device and storage medium for cooperative signature based on SM2 algorithm. Background technique [0002] In the field of information security and cryptography, PKI (Public Key Infrastructure, public key infrastructure) technology has become a more and more widely used general security technology since it appeared in the 1980s. As a technical system, the PKI system based on public key cryptography encrypts, decrypts, signs, and verifies data at the network transport layer and application layer, effectively ensuring the authenticity of user identities, confidentiality, and integrity of information. sex and signer non-repudiation, etc. [0003] Based on the application of PKI, the protection of the entity's private key is very important. The private key owned by an entity can only be accessed by the entity itself, and cannot be accessed by any other...

AI Technical Summary

Problems solved by technology

However, in the existing cooperative signature scheme, when one party in the communication sends the message digest to the other party, the message digest may be replaced by the attacker, so that the attacker can forge the signature

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