Provable certificateless generalized signcryption scheme

Authors:
Caixue Zhou;Wan Zhou;Xiwei Dong
Affiliations:
School of Information Science and Technology, University of Jiujiang, Jiujiang, People's Republic of China 332005;School of Information Science and Technology, University of Jiujiang, Jiujiang, People's Republic of China 332005;School of Information Science and Technology, University of Jiujiang, Jiujiang, People's Republic of China 332005
Venue:
Designs, Codes and Cryptography
Year:
2014

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Abstract

Generalized signcryption can adaptively work as an encryption scheme, a signature scheme or a signcryption scheme with only one algorithm. It is very suitable for storage-constrained environments. In this paper, we introduce a formal security model for certificateless generalized signcryption schemes secure against the malicious-but-passive key generation center attacks and propose a novel scheme. Our scheme is proved to be IND-CCA2 secure under the GBDH assumption and CDH assumption and existentially unforgeable under the GDH' assumption and CDH assumption in random oracle model. Furthermore, performance analysis shows the proposed scheme is efficient and practical.