Cryptanalysis of a certificateless signcryption scheme in the standard model
Certificateless signcryption is a useful primitive which simultaneously provides the functionalities of certificateless encryption and certificateless signature. Recently, Liu et al.  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.
Certificateless signcryption, Malicious-but-passive KGC attack, Semantic security, Existential unforgeability
Information Security and Trust
WENG, Jian; Yao, Guoxiang; DENG, Robert H.; CHEN, Min-Rong; and LI, Xianxue.
Cryptanalysis of a certificateless signcryption scheme in the standard model. (2011). Information Sciences. 181, (3), 661-667. Research Collection School Of Information Systems.
Available at: http://ink.library.smu.edu.sg/sis_research/1304