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Nonlinearity of the round function

Kontak M., Szmidt J.

Control and Cybernetics

2007

Vol. 36, no 4

1037-1044

In the paper we present the results which enable to calculate the nonlinearity of the round function with quite large dimensions, e.g. 32 x 32 bits, which are used in some block ciphers. It can be used to estimate resistance of these ciphers against linear cryptanalysis. We give the application to linear cryptanalysis of the TGR block cipher.

The signal to noise ratio in the differential cryptanalysis of 9 rounds of data encryption standard

Misztal M.

Journal of Telecommunications and Information Technology

2006

nr 3

49-59

There is presented the differential cryptanalysis method of attack on data encryption standard (DES) reduced to 9 rounds. More precise estimation than that of Biham and Shamir of the signal to noise (S/N) ratio is obtained. Also, method of using the ratio in calculation of required number of plaintexts is suggested. There are given results (time of performance) and implementation's issues of practical realisation of this attack.

Praktyczna kryptoanaliza różnicowa algorytmu DES zredukowanego do 8 rund

Misztal M.

Biuletyn Wojskowej Akademii Technicznej

1999

Vol. 48, nr 10

125-146

Przedstawiono podstawy kryptoanalizy różnicowej i jej zastosowanie do algorytmu DES zredukowanego do 8 rund. Zaprezentowano algorytm takiej kryptoanalizy. Podano wyniki i wnioski z praktycznej realizacji tego algorytmu.

There are presented the principles of differential cryptoanalysis and its application to DES reduced to 8 rounds. Algorithms of that cryptoanalysis is showed. There are given results and conclusions of practical realisation of this algorithm.