Cryptology ePrint Archive: Report 2006/012

Certificate-Based Encryption Without Random Oracles

Paz Morillo and Carla R`{a}fols

Abstract: We present a certificate-based encryption scheme which is fully secure in the standard model. Our scheme is based on the identity-based encryption scheme of Waters \cite{W05}. Although some generic constructions from IBE to CBE has been previously proposed, they use the Random Oracle heuristic or provide less practical schemes than ours. Finally, we point out that one of the existing generic constructions going from IBE to CBE is flawed.

Category / Keywords: public-key cryptography, identity-based encryption, certificate-based encryption

Date: received 10 Jan 2006, last revised 24 May 2006

Contact author: crafols at ma4 upc edu

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Note: Several typos and other small mistakes have been corrected.

Version: 20060524:111353 (All versions of this report)

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