Public verifiable signcryption schemes with forward secrecy

Signcryption is a new cryptographic technique which simultaneously provides both confidentiality and authenticity.Its efficiency is much higher than that of the traditional signature-then-encryption method.But signcryption schemes cannot provide forward secrecy and public verifiability as the traditional method does.This paper analyzed Zheng's original signcryption scheme.And proposed a new signcryption schemes with forward secrecy and public verifiability.Finally,gave a signcryption scheme based on ECC cryptography,which had forward secrecy and public verifiability.