Blind signature generation method based on SM9 digital signature algorithm

Abstract

The invention discloses a blind signature generation method based on an SM9 digital signature algorithm. The generation process is jointly participated by two parties, one party is a Signer, and the other party is a User, and the blind signature generation steps are as follows: 1) generating, by the Signer, a random number to calculate a first temporary variable R = r * P1, and sending R to the User; 2) after the User receives the R, generating two random numbers to calculate a second temporary variable w = e (alpha * R + alpha * beta * P1, Ppub-s), converting the data type of w into a bit string, then calculating a hash value h = H2 (Mll w, N) and a third temporary variable h' = alpha<-1> * h-beta mod N of the message M to be signed, and finally sending the h' to the Signer; 3) after the Signer receives the h', calculating a fourth temporary variable S' = (r-h ') * DID, and sending the S' to the User; and 4) after the User receives the S', calculating a signature value S = alpha * S', and outputting a signature (h, S). According to the method, on the basis of not changing the overall architecture of the SM9 signature algorithm, the message with a signature is blinded in the signature process, and the signature can be completed under the condition that the message is not leaked.

Description

technical field [0001] The invention relates to information security technology, in particular to a blind signature generation method based on SM9 digital signature algorithm. Background technique [0002] Digital signature is a kind of security protection technology that emerges with the development of information network technology. The purpose is to realize the function of traditional handwritten signature through technical means, and to identify the identity of the signer and the legality of the data content. It can also verify whether the original text of the document has changed during the transmission process, ensuring the integrity, authenticity and non-repudiation of the transmitted electronic document. Digital signature is an important part of public key cryptosystem and plays an important role in many occasions. [0003] Normally, the signer must know what the message he is signing is in order to sign the message. In many cases, when the signer is required to si...

AI Technical Summary

Problems solved by technology

The signer does not know the specific content of the signed message, and the signature cannot be traced after signing

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