Cryptology ePrint Archive: Report 2014/111

A Note on the CLRW2 Tweakable Block Cipher Construction

Gordon Procter

Abstract: In this note, we describe an error in the proof for CLRW2 given by Landecker et al. in their paper at CRYPTO 2012 on the beyond-birthday-bound security for tweakable block ciphers. We are able to resolve the issue, give a new bound for the security of CLRW2, and identify a potential limitation of this proof technique when looking to extend the scheme to provide asymptotic security.

Category / Keywords: secret-key cryptography /

Date: received 13 Feb 2014

Contact author: gordon procter 2011 at rhul ac uk

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Version: 20140216:154310 (All versions of this report)

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