A blind signature generation method based on sm9 digital signature algorithm

Abstract

The invention discloses a blind signature generation method based on SM9 digital signature algorithm. The generation process involves two parties, one is the signer Signer, the other is the user User, and the steps of generating the blind signature are as follows: 1) The signer Signer generates a random signature Number calculation first temporary variable R=r·P 1 , and send R to the user User; 2) After the user User receives R, generate two random numbers to calculate the second temporary variable w=e(α·R+α·β·P 1 , P pub‑s ), and convert the data type of w into a bit string, and then calculate the hash value h=H of the message M to be signed 2 (M||w, N) and the third temporary variable h′=α ‑1 h‑βmod N, and finally send h′ to Signer; 3) Signer calculates the fourth temporary variable S′=(r‑h′) D after receiving h′ ID , and send S' to User; 4) After User receives S', calculate the signature value S=α·S', and output the signature (h, S). On the basis of not changing the overall structure of the SM9 signature algorithm, the invention blinds the message with the signature in the signature process, and can complete the signature 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 security technology that emerges with the development of information network technology. The purpose is to realize the function of traditional handwritten signature through technical means, which is used to identify the identity of the signer and the legitimacy of the data content. It can also verify whether the original text of the document has changed during the transmission process, and ensure 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] Typically, a signer must know what message he is signing before signing a message. In many cases, when a signer is required to sign a message, he do...

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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