An efficient signcryption scheme based on ECC with forward secrecy and encrypted message authentication

In this paper, an efficient signcryption scheme based on elliptic curve cryptosystem is going to be proposed which can effectively combine the functionalities of digital signature and encryption and also takes a comparable amount of computational cost and communication overhead. The proposed scheme provides confidentiality, integrity, unforgeability and nonrepudiation, along with encrypted message authentication, forward secrecy of message confidentiality and public verification. By forward secrecy of message confidentiality function we mean, although the private key of the sender is divulged inattentively, it does not affect the confidentiality of the previously stored messages. By the public verification function we mean, any third party can verify directly the signature of the sender of the original message without the sender´s private key when dispute occurs. It enhances the justice of judge. In addition, proposed scheme will save great amount of computational cost. The proposed scheme can be applied to the lower computational power devices, like smart card based applications, e-voting and many more, due to their lower computational cost. The Proposed Scheme is discussed in this paper and is compared with the existing schemes with respect to computational cost and the security functions it provides.