A New Efficient Certificateless Signcryption Scheme

Certificateless public key cryptosystem overcomes the problem of the certificate management in the certificate-based public key cryptosystem and the inherent key escrow problem in the identity-based public key cryptosystem. Signcryption is a cryptographic primitive that combines both the functions of digital signature and public key encryption in a logical single step with lower computational costs and communication overheads than the traditional signature then encryption approach. In this paper, we proposed a new Certificateless Signcryption scheme which is more efficient than all the schemes available. Our scheme is based on the CDH and DL assumption. Moreover, we introduce a new character, i.e., public verifiability, into certificateless signcryption scheme.