Summary: Certified e-mail delivery has become one of the basic requirement in performing business transactions over the Internet securely. How to construct efficient fair protocols for certified e-mail delivery is of great interest. The notion of identity based cryptosystem has attracted much interest since its introduction by Shamir in 1984, as it eliminates the need of certificates and simplifies the key management. In this paper, we propose a fair protocol for certified e-mail delivery based on identity-based signatures. A semi-trust third party (TTP) is involved in our protocol to ensure fairness, who does not need to store anything except its own private-key. There is no need for an additional registration between users and TTP. The proposed scheme is the first identity-based protocol with such a concise frame and is computation- and communication-efficient.
For the entire collection see [Zbl 1098.94002].