Password Authentication, And Proxy Signature

Along with the development of computer and network communication technology, password and digital signature arises at the historic moment. Password is the most widely method to authenticate the legality of users. Authorized users have a identifier ID and password secret PIN different from other users in the system. The proxy signature is one kind of special signature, it was proposed for the first time by Mambo,Usudu and Okamoto in 1996. In a proxy signature scheme,an original signer is allowed to delegate his signing power to a designed person or group, who is called the proxy signer and can sign message on behalf of the original signer.In this paper, the main contributions are as follows:(1)Made some research about password authentication scheme, analysed the position,role of the security element in the verification process and the nternal mechanism of the password authentication scheme, and proposed a new password authentication scheme based on syndrome decoding.(2)On the basic of 'An agent based on elliptic curve signature scheme' proposed by Bai Guoqiang, etc, made some improvements to this scheme, hidden the information agent signature, cut the numbers of agent.(3) Combined the basic knowledge based on elliptic curve signature and proxy multi-signature system with the bilinear map, constructed a proxy multi-signature scheme. Analysed that the program can resist the forged signature of the agent attack , satisfy the requirements of proxy signature security features.