Forward-secure signcryption scheme based on ECC cryptography

Signcryption is a new cryptographic primitive which simultaneously provides both confidentiality and authenticity.Compared with the cases where the encryption and signature operations are simply sequentially composed,signcryption can achieve significant sa-vings both in computational and communication overhead.The security of elliptic curve cryptography digital signature scheme described in IEEE P1363 is studied,and two security drawbacks of that scheme is pointed out: It can't protect the confidence of the signature and it can't provide forward security.In order to conquer those drawbacks,based on elliptic curve cryptography key agreement protocols and the method of signcryption,a forward-secure signcryption scheme is proposed,which can apply to a common cryptography system of ECC.Symmetrical key agreement,digital signature and encryption can be realized once the scheme is implemented.Finally,the scheme is proved has lots of secure characters,which are key agreement forward-secure,signature forward-secure and resistant to forging attack.