Society-Oriented Digital Signature

In 1949,C. E. Shannon announced the paper "Communication Theory of Secrecy Systems" which learned to establish the solid theories foundation and make the cryptography become a real subject. In 1976, W. Diffie announced with the M. E. Hellman "New Direction in Cryptography" in which put forward a kind of brand-new cryptology design thought, causing a revolution of cryptography, from but founded the new era of public key cryptography. Along with the technology of computer quickly develop in network, depending on information commutation in network every kind of electronic commerce could be realize and develop rapidly . All of these convenience people's work and life . However, because of technique reasons or attackers, the information may be wiretap, distort, or delete in deliver of process, information security suffered to threaten seriously. Positively because of this, the digital signature is used as a kind of technique having function of the new integrity authentication, identification, non-repudiation and encryption.In different from traditional public key system, Society-oriented digital signature is not single dispatcher and single receiver in signature system, but is a group, in which member's relation may be equal, may be a complicated construction. Therefore, society-oriented digital signature contain various different types of digital signature, such as group signature, multi-signature, threshold group signature, proxy group signature etc. This paper aims at primarily group signature, multi-signature and signcryption.The main contributions are as follows:1. Because the group signature can be offer anonymity for any member in group and also can be canceled anonymity in necessary time by the unique authority to do it. Because of these, group signature make itself has a extensive application in electronic commerce. Therefore, security and efficiency is very important to group signature . In the paper ,we the development process of group signature, and analyzed two important schemes prove that the scheme[TJ]is not satisfied with unforgeability, the scheme[Xu] is not satisfied with robustness, traceability, security against framing attack .2. Signcryption is a new cryptographic technology, which simultaneously fulfills both the faction of digital signature and public key encryption in a logically single step,...