Cryptology ePrint Archive: Report 2005/426

On the Security of a Certificateless Public-Key Encryption

Zhenfeng Zhang and Dengguo Feng

Abstract: 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. In 2005, Al-Riyami and Paterson proposed a new certificateless public-key encryption scheme 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.

Category / Keywords: public-key cryptography / certificateless public key encryption, cryptanalysis

Date: received 23 Nov 2005

Contact author: zfzhang at is iscas ac cn

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Version: 20051123:222808 (All versions of this report)

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