Similar Group Signature Scheme Based On Elliptic Curve

With the fast development of the networks as well as the rapid change of the electronic trading in the business,digital signature is sure to be attractive for more extensive applications,simultaneously the research on digital signature is deepening.This paper mainly studies the following aspects:The dissertion analyzes the course of the study about group signature and ring signature,contrary to the different characterstics and applications of the two signatures,the dissertion proposes a new similar group signature. This scheme with the characteristics of unconditional anonymity, unforgeability, linkable. Simultaneously, it avoids the weakness of the non-signers were falsely accused by the true signers in ring signaure.This scheme is proposed based on the bilinear pairings,it is simple and convenient. At the same time,the private keys of the group are generated by the signers, so it reduces the interaction between the group administrator and signers, therefore the efficiency is improved. This scheme has great use of space in the electronic elections.This dissertation analyzes a similar group signature proposed by Wang Jilin etc. We found that this scheme existed security vulnerability——under the cooperation of the signature verifier and non-signer the attacker can determines the identity of the ture signer. This dissertation improves the sheme based on elliptic curve.Finally, the dissertation analyzes the security issues in vehicle self-organizing networks and proposes a new signature scheme which suits the vehicle self-organizing networks. In the application this sheme meets the requirements of tamper-resistant, anonymity, traceability after the accident. It satistises the security issues of the exchange of information in the network..