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Erschienen in:
2010 | OriginalPaper | Buchkapitel
Rotational Cryptanalysis of ARX
verfasst von : Dmitry Khovratovich, Ivica Nikolić
Erschienen in: Fast Software Encryption
Verlag: Springer Berlin Heidelberg
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In this paper we analyze the security of systems based on modular additions, rotations, and XORs (ARX systems). We provide both theoretical support for their security and practical cryptanalysis of real ARX primitives. We use a technique called
rotational cryptanalysis
, that is universal for the ARX systems and is quite efficient. We illustrate the method with the best known attack on reduced versions of the block cipher Threefish (the core of Skein). Additionally, we prove that ARX with constants are functionally complete, i.e. any function can be realized with these operations.