## Cryptology ePrint Archive: Report 2009/572

On the Equivalence of Two Models for Key-Dependent-Message Encryption

Alexander W. Dent

Abstract: In this paper we examine the relationship between the security models for key-dependent-message encryption proposed by Backes \emph{et al.} \cite{Backes:08:OAEP} and Camenisch \emph{et al.} \cite{Camenisch:09:Public}. We show that when the two notions are equivalent for certain logical classes of function families when the number of keys $\ell$ in the system is logarithmically small.

Category / Keywords: public-key cryptography /

Date: received 25 Nov 2009, last revised 9 Sep 2012, withdrawn 10 Nov 2012

Contact author: a dent at rhul ac uk

Available format(s): (-- withdrawn --)

Note: The proof in this paper contains a flaw which we cannot currently overcome. Hence, we are withdrawing the paper until we can provide a full proof.

Short URL: ia.cr/2009/572

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