Research And Application Of Proxy Signature Based On Conic Curves Over Z_n

With the development of computer network and communication techniques, information security problem becomes more and more important. As a branch of public cryptography-the cryptography system based on difficulty of calculate on curves has raised many people's attention. Particular, elliptic conic cryptography has published correlative standard. The new conic curves cryptography and its application in signature was researched by more and more people.Proxy signature is a special kind of digital signature.Since the idea of proxy signature meets the requirements of multi-bank system models, some researchers proposed a multi-bank E-cash system based on proxy signature and gived proofs of the scheme.Firstly, this thesis introduces some basic knowledge related to proxy signature ,and introduces the basic definition and characters of conic curve over finite field Fp and GF (2 n) and ring Z n, pointing out the method which used to compute the basic point and add point and analyzing the conic curves cryptography based on ring Z n.Secondly, we introduce the definition, characters and classification of proxy signature.Systemic introduced the proxy blind signature, anonymous proxy signature and proxy multiblind signature. Then, several special proxy signature just as proxy blind signature scheme and anonymous proxy signature scheme were constructed on conic curves.Finally, we construct a secure and high efficiency multi-bank e-cash system with conic curves cryptography and proxy signature. As the analysis show that the system meet the security, rationality, anonymity.