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Security Pitfalls of the Certificateless Signature and Multi-Receiver Signcryption Schemes

Shim K. A., Lee Y. L.

Fundamenta Informaticae

2011

Vol. 112, nr 4

365-376

Recently, Xiong et al. and Selvi et al. proposed a certificateless signature scheme secure in the standard model and a certificateless multi-receiver signcryption scheme secure in the random oracle model, respectively. In this paper, we show that they are insecure against malicious-butpassive KGC attacks. More specifically, the former does not achieve unforgeability and the latter does not satisfy confidentiality against type II adversaries.