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Is it possible to have CBE from CL-PKE?

Authors:
Bo Gyeong Kang
Je Hong Park
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URL: http://eprint.iacr.org/2005/431
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Abstract: Recently, Al-Riyami and Paterson proposed a generic conversion from CL-PKE (Certificateless Public Key Encryption) to CBE (Certificate Based Encryption) and claimed that the derived CBE scheme is secure and even more efficient than the original scheme of Gentry. In this paper, we show that their conversion is wrong due to the flaw of the security proof. It leads the new concrete CBE scheme by Al-Riyami and Paterson to be invalidated. In addition, our result supports the impossibility to relate both notions in any directions.
BibTeX
@misc{eprint-2005-12764,
  title={Is it possible to have CBE from CL-PKE?},
  booktitle={IACR Eprint archive},
  keywords={public-key cryptography /},
  url={http://eprint.iacr.org/2005/431},
  note={ jhpark@etri.re.kr 13182 received 24 Nov 2005, last revised 3 Feb 2006},
  author={Bo Gyeong Kang and Je Hong Park},
  year=2005
}