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Cryptanalysis of a Certificateless Encryption Scheme in the Standard Model

Certificateless public key cryptography (CL-PKC) is an important type of public key cryptography, which effectively solves the inherent key escrow problem in identity based public key cryptography while keeps its certificate-free property. As the adversarial models in CL-PKC are relatively complex, designing efficient and secure certificate less encryption schemes in the standard model has been an interesting and challenging research topic. In this paper, we give cryptanalysis to an existing certificate less encryption scheme in the standard model. We show its insecurity by demonstrating two kinds of attacks.