A Studay About The Group-Oriented Signagnature In Electrical Signature

Paper work is rapidly being replaed as e-mail, electronic commerce, electronic money, etc. become more and more widespread. In many of these new forms of communication, the signature is essential.In recent years, the electrical signature are used to lots of the business market and public service OA system, the essential of electrical signature is digital signature, because the digital signature offer the properties such as integrality and anthentication. Integrality guarantees that a message being transferred never gets corrupted, and anthentication guarantees that the signer can't be impersonated.Traditinal digital signature only allows a single signer to sign a message, and anyone can verify the signature at anytime. Howeven, there are growing and growing numbers of times when a message needs to be signed by a set of signers and for distrubiting the power of a single authority. Threshold signature (group-oriented signature) schemes have thus been designed to solve such problem.In this paper, it will introduce the group-oriented signature and a group-oriented cryptosystem, analysis the the weekness of the cryptosystem and improve it.build a high-extensibility electrical signature system, and do a study about how to implement the group-oriented signature in this electrical signature system。...