Geodesic
Optimal linear approximations for Feistel networks. Estimation for the resistance of the cipher SMS4 to linear cryptanalysis
Prikladnaya Diskretnaya Matematika. Supplement, no. 5 (2012), pp. 58-60 
G. I. Shushuev. Optimal linear approximations for Feistel networks. Estimation for the resistance of the cipher SMS4 to linear cryptanalysis. Prikladnaya Diskretnaya Matematika. Supplement, no. 5 (2012), pp. 58-60. http://geodesic.mathdoc.fr/item/PDMA_2012_5_a30/
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     author = {G. I. Shushuev},
     title = {Optimal linear approximations for {Feistel} networks. {Estimation} for the resistance of the cipher {SMS4} to linear cryptanalysis},
     journal = {Prikladnaya Diskretnaya Matematika. Supplement},
     pages = {58--60},
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     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PDMA_2012_5_a30/}
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Voir la notice de l'article provenant de la source Math-Net.Ru

An approach to obtain the best linear approximations for Feistel networks is proposed. The resistance of the cipher SMS4 to linear cryptanalysis is investigated.

[1] Matsui M., “Linear Cryptoanalysis Method for DES Cipher”, LNCS, 765, 1994, 386–397 | Zbl

[2] Diffie W., Ledin G., SMS4 encyption algorithm for wireless networks, Cryptology ePrint Archive, Report 2008/329 , 2008 http://eprint.iacr.org/2008/329