The Independence of Linear Approximations in Symmetric Cryptanalysis

descriptionPublicationkeyboard_double_arrow_right Article 01 Dec 2006Publisher:Institute of Electrical and Electronics Engineers (IEEE)Journal:IEEE Transactions on Information Theory, volume 52, pages 5,510-5,518 (issn: 0018-9448,

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Authors: S. Murphy;

doi: 10.1109/tit.2006.885528

The Independence of Linear Approximations in Symmetric Cryptanalysis

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Abstract

Summary: A theoretical framework for the use of multiple linear approximations in the linear cryptanalysis of block ciphers is given. The covariance of two mask counts is derived, and it is shown that under appropriate conditions the mask counts in linear cryptanalysis are stochastically independent, whether or not the masks are linearly independent. Some consequences of these observations are also considered.

Related Organizations

University of London
United Kingdom

Keywords

Cryptography, linear cryptanalysis, Block cipher, symmetric cryptology, multiple approximations

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