Towards confidentiality of ID-Based signcryption schemes under without random oracle model

Authors:
Mingwu Zhang;Pengcheng Li;Bo Yang;Hao Wang;Tsuyoshi Takagi
Affiliations:
Department of Computer Science and Engineering, College of Informatics, South China Agricultural University, Guangzhou, China;Department of Computer Science and Engineering, College of Informatics, South China Agricultural University, Guangzhou, China;Department of Computer Science and Engineering, College of Informatics, South China Agricultural University, Guangzhou, China;School of Electronic and Information Engineering, South China University of Technology, Guangzhou, China;Faculty of Mathematics, Kyushu University, Fukuoka, Japan
Venue:
PAISI'10 Proceedings of the 2010 Pacific Asia conference on Intelligence and Security Informatics
Year:
2010

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Abstract

Signcryption, achieves confidentiality and authenticity simultaneously in an efficient manner, is a novel cryptographic primitive in a single logic step with more efficient computation and communication cost to support the security. In this paper, we analyze two identity based signcryption schemes under the without random oracles model including a signcryption scheme by Yu et al. [11] and a certificateless signcryption scheme by Liu et al. [12]. We give the chosen plaintext attacks to prove that the proposed previous schemes cannot resist on the indistinguishability on chosen ciphertext attack to support semantic secure for confidentiality.