Identity-based signatures in standard model

摘要

Tight security proofs allow for shorter security parameters and better efficiency. In this paper, we firstly present a new signature scheme, SSSTR, which is strongly existentially unforgeable under adaptively chosen message attacks and whose security is tightly related to Strong Diffie-Hellman assumption in the standard model, and then give two identity-based signatures which are existentially unforgeable under adaptively chosen message and identity attacks and whose security is also tightly related to Strong Diffie-Hellman assumption in the standard model.