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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
Creative Commons Attribution
CC BY
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