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Differential cryptanalysis of DES-like cryptosystems. (English) Zbl 0729.68017
Summary: The Data Encryption Standard (DES) is the best known and most widely used cryptosystem for civilian applications. It was developed at IBM and adopted by the National Bureau of Standards in the mid 1970s, and has successfully withstood all the attacks published so far in the open literature. We develop a new type of cryptanalytic attack which can break the reduced variant of DES with eight rounds in a few minutes on a personal computer and can break any reduced variant of DES (with up to 15 rounds) using less than \(2^{56}\) operations and chosen plaintexts. The new attack can be applied to a variety of DES-like substitution/permutation cryptosystems, and demonstrates the crucial role of the (unpublished) design rules.

MSC:
94A60 Cryptography
68P25 Data encryption (aspects in computer science)
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