The Research And Application Of Strong Proxy Signature

In daily life, people often need delegate their powers to reliable proxies who perform these powers on their behalf, such as delegating signature power. In electrion society, delegating power of signature is also needed, digital signature is electronic simulation of traditional signature, but digital signature can't function as proxy signature. Thus proxy signature comes into being as a special digital signature. In fast developing information society, proxy signature is more and more applied, in the same time its requirements even higher, a concept of strong proxy signature was advanced with these requirements. The reason why the existing proxy signatures can't be put in practice is mainly these signatures can't come up to the qualities of strong proxy signature.Strong proxy signature is researched and discussed in this paper. First the concept and qualities of strong proxy signature are introduced, the existing strong proxy signatures are analyzed, a new strong proxy signature is presented, and the security and validity of new system are proved. Secondly the concept of strong proxy blind signature is advanced with combination of blind signature and strong proxy signature, its the qualities and research actuality are introduced, the existing proxy blind signatures based on discrete logarithm are analyzed from the qualities of strong proxy and strong blind, a new strong proxy blind signature scheme is advanced, and the security and validity of it is proved as well. Lastly the application of strong proxy signature in electronic cash signs and issues system is presented, the electronic cash signs and issues protocol is particularly designed, also the validity and feasibility in theory of system is demonstrated.