Agent signature method based on Mamo

Abstract

The invention discloses a proxy signature method based on Mamo, which comprises the following steps: A randomly selects an integer k, solves r and s through a formula, and sends (r, s) as a proxy key to B through a secure channel; after receiving the (r, s), B firstly verifies whether the equation is established or not, if so, (r, s) can be considered to be sent by A, and the commission of A can be accepted, otherwise, the commission of A can be refused to be accepted or A is required to send a copy (r, s) again; and B, after the verification equation is established, calculating a proxy public key Y by using the proxy secret key and a private key of the B, and publicizing the proxy public key Y. Calculating a hash value H (m) of the message m to be signed through a hash function; then (u, v) is solved, and (u, v) is sent to C as a proxy digital signature of the message m to be signed; after receiving (u, v) and m, the C verifies whether the equations are equal; if yes, the received signature is valid; the verification program of the proxy signature is simple; only the proxy signature needs to be verified each time, and the calculation amount is small.

Description

technical field [0001] The invention relates to the field of proxy signatures, in particular to a Mambo-based proxy signature method. Background technique [0002] Proxy signature means that the original signer entrusts his signature rights to the proxy signer, and then lets the proxy signer generate a valid signature on his behalf; this signature method is often used in the commercial field and has always been highly scientific and practical value; the existing Mambo proxy signature scheme is specifically: [0003] First assume that A is the original signer, B is the proxy signer, and C is the signature verifier. Randomly select a large prime number p, q is a large prime factor of p-1, and g is generator of . A's private key and public key pair are (x A ,y A ), B's private key and public key pair is (x B ,y B ),in The message to be signed is marked as m, and the specific process is as follows: [0004] (1) The process of proxy key generation; [0005] The or...

AI Technical Summary

Problems solved by technology

[0016] Analyzing the above signature scheme, it is found that the proxy signer can sign the message to generate a proxy signature scheme, and the original signer can also sign the message to forge a proxy signature scheme; even if the signature verifier verifies the proxy signature scheme is correct, and will only think that the scheme is sent by the proxy signer. In fact, the signature scheme may also be forged by the original signer, which violates the concept of proxy signature and violates the legal rights of the proxy signer; A Proxy Signature Method Based on Mambo

Images