Research On Forword-secure Digital Signatures

The digital signature is different from traditional signature,it is based on public key cryptosystems and is constructed by cryptogram arithmetic. Because digital signature can solve repudiation, forgery, tamper and imitation, it becomes an important part of solving the security of electronic commerce. With various application backgrounds in electronic commerce, a research on digital signatures having different features is not only necessary but also important. Both forword-secure digital signatures and biometric identity based signatures are analyzed and studied in this paper. The main work is as follows:1. The overview of forward-secure digital signature is presented and generic constructions and security models of forward-secure digital signature are described, at the same time, the merit and applied foreground of forward-secure digital signature scheme are analyzed.2. A new forward-secure digital signature scheme is proposed from bilinear pairings on elliptic curve.The security of the new scheme is based on the security of elliptic curve cryptosystem and difficulty assumption of discrete logarithim problems.3. A biometric identity based signature scheme is constructed which uses biometric information to construct the public key. The signer need not submit additional identity proof to authoritative organization in the scheme. So the scheme saves more space and time than normal identity based signature scheme.