Cryptanalysis of a certificateless signcryption scheme in the standard model

• Main Authors: WENG, Jian, YAO, Guoxiang, DENG, Robert H., CHEN, Min-Rong, LI, Xianxue
• Format: text
• Language: English
• Published: Institutional Knowledge at Singapore Management University 2011
• Subjects: Certificateless signcryption; Malicious-but-passive KGC attack; Semantic security; Existential unforgeability; Information Security
• Online Access: https://ink.library.smu.edu.sg/sis_research/1304; https://ink.library.smu.edu.sg/context/sis_research/article/2303/viewcontent/Cryptanalysis_2010_afv.pdf
• Institution: Singapore Management University

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.