Anzeige
Erschienen in:
2007 | OriginalPaper | Buchkapitel
Improved Security Analysis of XEX and LRW Modes
verfasst von : Kazuhiko Minematsu
Erschienen in: Selected Areas in Cryptography
Verlag: Springer Berlin Heidelberg
Aktivieren Sie unsere intelligente Suche, um passende Fachinhalte oder Patente zu finden.
Wählen Sie Textabschnitte aus um mit Künstlicher Intelligenz passenden Patente zu finden. powered by
Markieren Sie Textabschnitte, um KI-gestützt weitere passende Inhalte zu finden. powered by
We study block cipher modes that turn a block cipher into a tweakable block cipher, which accepts an auxiliary variable called tweak in addition to the key and message. Liskov et al. first showed such a mode using two keys, where one is the block cipher’s key and the other is used for some non-cryptographic function. Later, Rogaway proposed the XEX mode to reduce these two keys to one key. In this paper, we propose a generalization of the Liskov et al.’s scheme with a concrete security proof. Using this, we provide an improved security proof of the XEX and some improvements to the LRW-AES, which is a straightforward AES-based instantiation of Liskov et al.’s scheme proposed by the IEEE Security in Storage Workgroup.