1995 | OriginalPaper | Buchkapitel
A Generalization of Linear Cryptanalysis and the Applicability of Matsui’s Piling-up Lemma
verfasst von : Carlo Harpes, Gerhard G. Kramer, James L. Massey
Erschienen in: Advances in Cryptology — EUROCRYPT ’95
Verlag: Springer Berlin Heidelberg
Enthalten in: Professional Book Archive
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Matsui’s linear cryptanalysis for iterated block ciphers is generalized by replacing his linear expressions with I/O ssons sums. For a single round, an I/O sum is the XOR of a balanced binary-valued func- tion of the round input and a balanced binary-valued function of the round output. The basic attack is described and conditions for it to be successful are given. A procedure for finding effective I/O sums, i.e., I/O sums yielding successful attacks, is given. A cipher contrived to be se- cure against linear cryptanalysis but vulnerable to this generalization of linear cryptanalysis is given. Finally, it is argued that the ciphers IDEA and SAFER K-64 are secure against this generalization.