On the Security of a Certificateless Public-Key Encryption


Certificateless public-key cryptosystem is a recently proposed attractive paradigm using public key cryptosystem, which avoids the key escrow inherent in identity-based public-key cryptosystems, and does not need certificates to generate trust in public keys. Recently, Al-Riyami and Paterson proposed a new certificateless public-key encryption scheme [2, 3] and proved its security in the random oracle model. This paper shows that their scheme is vulnerable to adaptive chosen ciphertext attacks, and presents a countermeasure to overcome such a security flaw.

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@article{Zhang2005OnTS, title={On the Security of a Certificateless Public-Key Encryption}, author={Zhenfeng Zhang and Dengguo Feng}, journal={IACR Cryptology ePrint Archive}, year={2005}, volume={2005}, pages={426} }