[Resource Topic] 2005/426: On the Security of a Certificateless Public-Key Encryption

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Title:
On the Security of a Certificateless Public-Key Encryption

Authors: Zhenfeng Zhang, 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.

ePrint: https://eprint.iacr.org/2005/426

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