Provable secure identity based generalized signcryption scheme

Authors:
Gang Yu;Xiaoxiao Ma;Yong Shen;Wenbao Han
Affiliations:
Department of Applied Mathematics, Zhengzhou Information Science and Technology Institute, Zhengzhou 450002, China;School of Surveying and Land Information Engineering of Henan Polytechnic University, Jiaozuo 454003, China;Department of Applied Mathematics, Zhengzhou Information Science and Technology Institute, Zhengzhou 450002, China;Department of Applied Mathematics, Zhengzhou Information Science and Technology Institute, Zhengzhou 450002, China
Venue:
Theoretical Computer Science
Year:
2010

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Abstract

According to actual needs, a generalized signcryption scheme can flexibly work as an encryption scheme, a signature scheme or a signcryption scheme. In this paper, firstly, we give a security model for identity based generalized signcryption which is more complete than the existing model. Secondly, we propose an identity based generalized signcryption scheme. Thirdly, we give the security proof of the new scheme in this complete model. Compared with existing identity based generalized signcryption, the new scheme has less implementation complexity. Moreover, the new scheme has comparable computation complexity with the existing normal signcryption schemes.