Is it possible to have CBE from CL-PKE?

Bo Gyeong Kang; Je Hong Park

Paper 2005/431

Is it possible to have CBE from CL-PKE?

Bo Gyeong Kang and Je Hong Park

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.

Metadata

Available format(s): PDF PS
Category: Public-key cryptography
Publication info: Published elsewhere. Unknown where it was published
Contact author(s): jhpark @ etri re kr
History: 2006-02-03: last of 2 revisions; 2005-11-27: received; See all versions
Short URL: https://ia.cr/2005/431
License: CC BY

BibTeX

@misc{cryptoeprint:2005/431,
      author = {Bo Gyeong Kang and Je Hong Park},
      title = {Is it possible to have {CBE} from {CL}-{PKE}?},
      howpublished = {Cryptology {ePrint} Archive, Paper 2005/431},
      year = {2005},
      url = {https://eprint.iacr.org/2005/431}
}