The Relevant Research On Proxy Signature

The vogue of Internet is making the changes of the people's style. With the rapid development of Internet, the theory and technology of information security become more and more important. Security is one of the key elements of the development of Internet. Digital certification can take the place of identification and verification in virtual world constructed by computer network. The digital signature is the foundation and guarantee of the information security and plays a key role in protecting the security of networking communication.Proxy signature schemes are the variation of digital signature schemes.The proxy signature is a signature scheme that an original signer delegates his/her signing capability to a proxy signer without leaking his or her private key, and then the proxy signer creates a valid signature on behalf of the original signer, the receiver of the signature verifies the signature itself and the original signer's delegation together.The thesis proposes an improved scheme based on ID-based proxy signature to solve the problem of key leakage; and puts forward the second scheme in which the information of the signatories are hiden based on the first one.The contents of this thesis are as follows:1. Summarize the relevant knowledge about Digital Signature System, Blind Signature and Proxy Signature, as well as mathematics and cryptography related to Proxy Signature.2. Analyse in very great detail a couple of typical Digital Signature schemes and their respective defects.3. Put forward two Proxy Signature Schemes based on the analysis of the defects of the typical signature schemes. A forward secure ID-based proxy signature scheme and A forward secure ID-based proxy blind signature scheme...