Cryptanalysis of an Identity Based Signcryption without Random Oracles

Article type: Research Article

Authors: Xiong, Hu | Qin, Zhiguang | Li, Fagen

Affiliations: School of Computer Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, P.R.China. [email protected]

Note: [] This work is supported by National Natural Science Foundation of China under Grant No. 61003230 and China Postdoctoral Science Foundation under Grant No. 20100480130. Address for correspondence: No. 4, Section 2, North Jianshe Road, Chengdu, P.R.China

Abstract: Signcryption is a cryptographic primitive that performs digital signature and public key encryption simultaneously, at lower computational costs and communication overhead than signing and encrypting separately. Recently, Yu et al. proposed an identity based signcryption scheme with a claimed proof of security. We show that their scheme is not secure even against a chosen-plaintext attack.

Keywords: Signcryption, Identity-based cryptography, Chosen plaintext attack

DOI: 10.3233/FI-2011-395

Journal: Fundamenta Informaticae, vol. 107, no. 1, pp. 105-109, 2011