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Cryptanalysis of a certificateless signcryption scheme in the standard model |
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| Authors: | Jian Weng Guoxiang Yao Robert H Deng Xiangxue Li |
| Affiliation: | a State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing 100876, China b Department of Computer Science, Jinan University, Guangzhou 510632, China c State Key Laboratory of Information Security, Institute of Software, Chinese Academy of Sciences, Beijing 100080, China d School of Information Systems, Singapore Management University, Singapore 178902, Singapore e College of Information Engineering, Shenzhen University, Shenzhen 518060, China f Department of Computer Science and Technology, East China Normal University, Shanghai 200241, China |
| Abstract: | Certificateless signcryption is a useful primitive which simultaneously provides the functionalities of certificateless encryption and certificateless signature. Recently, Liu et al. 15] proposed a new certificateless signcryption scheme, and claimed that their scheme is provably secure without random oracles in a strengthened security model, where the malicious-but-passive KGC attack is considered. Unfortunately, by giving concrete attacks, we indicate that Liu et al. certificateless signcryption scheme is not secure in this strengthened security model. |
| Keywords: | Certificateless signcryption Malicious-but-passive KGC attack Semantic security Existential unforgeability |
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