Secure and Efficient Generalized Signcryption Scheme Based on a Short ECDSA

Generalized signcryption is a new cryptographic primitive which is more useful than the common signcryption in some applications. In this paper, based on a short ECDSA, a secure and efficient generalized signcryption scheme is proposed. It can work as the same with the original generalized signcryption scheme ECGSC and provides message confidentiality, unforgeability, non-repudiation. The notable property of our scheme is its additional secure properties and its high efficiency. It can provide forward secrecy and public verification which is important in many cases. Its computation cost and communication cost are all less than that of ECGSC due to the use of a short ECDSA and the short transmitted message in our scheme.