Cryptology ePrint Archive: Report 2007/173

Provable Secure Generalized Signcryption

Xu An Wang and Xiaoyuan Yang and Yiliang Han

Abstract: Generalized signcryption which proposed by Han is a new cryptographic primitive which can work as an encryption scheme, a signature scheme or a signcryption scheme[5]. However,the security proof in their paper is not very formal.our contribution are as following:First we give security notions for this new primitive.Secnond,we give an attack to [4]which is the first vision of [5] and propose an improved generalized signcryption scheme. Third, we give new very formal proofs for this new scheme.

Category / Keywords: public-key cryptography / foundations

Date: received 9 May 2007, last revised 21 May 2008

Contact author: wangxahq at yahoo com cn

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Version: 20080521:111320 (All versions of this report)

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