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Generalization and Extension of XEX* Mode

Kazuhiko MINEMATSU, Toshiyasu MATSUSHIMA

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Summary :

This paper describes an extension of XEX* mode, which is a method to convert a block cipher into a tagged tweakable block cipher, a notion introduced by Rogaway in 2004 as an extension of the tweakable block cipher by Liskov et al. Our extension attaches an additional encryption function to the original XEX*, which has some limitation but is slightly faster than the encryption implemented by XEX*. We prove our scheme's security in a general form, where the offset function, a key component of our construction, is not restricted to the one used by XEX*. We also provide some applications of our result, in particular to OCB 2.0, an authenticated encryption based on XEX*.

Publication
IEICE TRANSACTIONS on Fundamentals Vol.E92-A No.2 pp.517-524
Publication Date
2009/02/01
Publicized
Online ISSN
1745-1337
DOI
10.1587/transfun.E92.A.517
Type of Manuscript
PAPER
Category
Cryptography and Information Security

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