Signcryption scheme with public verifiability and forward security

This paper proposes an identity based signcryption scheme with both public verifiability and forward security using bilinear pairings.The scheme can separate the signature verification from message recovery.It can be applied in mobile E—business scenario,such as filtration of bad instant messages of mobile equipment.The proposed scheme is proved to be secure assuming the bilinear Diffie-Hellman problem is hard.This scheme is also very efficient regarding the computation costs and the communication overheads after analyzing and being compared with other schemes.