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Erschienen in:
1999 | OriginalPaper | Buchkapitel
On the Lai-Massey Scheme
verfasst von : Serge Vaudenay
Erschienen in: Advances in Cryptology - ASIACRYPT’99
Verlag: Springer Berlin Heidelberg
Enthalten in: Professional Book Archive
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Constructing a block cipher requires to define a random permutation, which is usually performed by the Feistel scheme and its variants. In this paper we investigate the Lai-Massey scheme which was used in IDEA. We show that we cannot use it “as is” in order to obtain results like Luby-Rackoff Theorem. This can however be done by introducing a simple function which has an orthomorphism property. We also show that this design offers nice decorrelation properties, and we propose a block cipher family called Walnut.