Research Of The Proxy Signature Scheme Based On Discrete Logarithm

With the development and wide application of internet and information systems,information security has become particularly important.Digital signature plays an important role in modern information security,digital signature can provide the undeniableness which traditional cryptography can not provide.Proxy signature is a special kind of digital signature,in the modern informationized life people need to authorize their signature right to their trust agents in many cases and let the agents to exercise their rights,proxy signature as the answer to this question arises at the historic moment.Proxy signature is widely used in mobile agent,electronic commerce,electronic cash and so on,research and design of proxy signature algorithm are of great significance,In this paper,the proxy signature schemes based on discrete logarithm are studied.This paper contains the following contents:1.The proxy signature systems are thoroughly analysised and studied in the paper,the research background and present situation of proxy signature are introduced in the paper,the related concepts of digital signature and proxy signature are expounded.2.All proxy signature schemes are based on common digital signature schemes,so to design secure proxy signature scheme,the general digital signature algorithms must be fully studied.The several typical digital signature algorithms are introduced in this paper,then a new digital signature scheme is proposed in the foundation of security analysis.3.A proxy signature algorithm is studied:Mambo proxy signature algorithm,then the corresponding improved algorithm is proposed after analyzing their security.Then a new application scenarios is proposed:how to complete the proxy signature without revealing the identity of the agent.Finally a proxy signature scheme which can protect the proxy signer's identity is proposed.4.Then the multi-proxy signature algorithm is studied,Harn multi-proxy signature algorithm is analyzed and the security flaws are pointed out,finally the improved scheme is proposed in this paper.Proxy signature systems are widely used in electronic auction,electronic voting,electronic commerce and mobile agent,the proxy signature systems are thoroughly analysised and studied in this paper,the research relates to ordinary digital signature schemes,ordinary proxy signature scheme,proxy signature scheme which can protect the'proxy signer's identity and multi-proxy signature scheme,the corresponding algorithms are proposed,these achievements enrich the study and design of the proxy signature.