Identity-based digital signature password reverse firewall method

Abstract

The invention discloses an identity-based digital signature password reverse firewall method, and belongs to the technical field of information security. The method comprises the following steps: firstly, a transparent and credible password reverse firewall is set at a signature end, and related system parameters are set; the password reverse firewall re-randomizes part of the received parametersand then transmits the re-randomized parameters and other non-re-randomized parameters to the signature end; the signature end carries out signature to obtain a signature result sigma = (V, Ru, Rm), the rear two parts of the signature result are reset through the password reverse firewall of the signature end, and then the partially reset signature result is transmitted to a verification end; andthe verification end verifies the legality of the received signature result, if the signature result passes the verification, 'acceptance' is output, and otherwise, 'rejection' is output. According tothe identity-based digital signature password reverse firewall method, transparency and credibility are realized, leakage is prevented, the safety of a user is improved, and the attack behavior of aninternal attacker is particularly protected.

Description

technical field [0001] The invention belongs to the technical field of information security, in particular to a reverse firewall method suitable for identity-based signature passwords. Background technique [0002] The password reverse firewall technology appeared after the Snowden Prism incident in 2014, aiming at how to ensure that the information transmitted by users is not leaked under the monitoring and backdoor control of "big brothers". It is a new technology that assumes that the computer used by the user is fully compromised, but how to ensure that the information he transmits will not be leaked. The fundamental difference is that the attacks considered before are all external adversaries, but many facts in real life have proved that various encryption software and other security-related things have backdoors. If there are internal attackers, how should people solve this problem. [0003] After the Snowden incident, more and more people pay more attention to the pr...

AI Technical Summary

Problems solved by technology

[0010] Although the password reverse firewall is more convenient and simpler than the previous technology, and it does not need to analyze the internal algorithm to experiment with the internal random number, but the password reverse firewall has certain limitations, and its requirements for re-randomization are relatively high

Because the requirement of re-randomization exists, and most digital signatures (such as Schnorr signature, DSS signature, Hess signature and some famous signatures) have a hash function in the algorithm implementation, and the hash function is irreversible, which means that the password Reverse firewall technology is difficult to implement on most digital signatures

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