A New Version of the Stream Cipher SNOW
SAC '02 Revised Papers from the 9th Annual International Workshop on Selected Areas in Cryptography
Cryptanalysis of Stream Ciphers with Linear Masking
CRYPTO '02 Proceedings of the 22nd Annual International Cryptology Conference on Advances in Cryptology
Cryptanalysis of Sosemanuk and SNOW 2.0 Using Linear Masks
ASIACRYPT '08 Proceedings of the 14th International Conference on the Theory and Application of Cryptology and Information Security: Advances in Cryptology
FSE'06 Proceedings of the 13th international conference on Fast Software Encryption
Improved linear distinguishers for SNOW 2.0
FSE'06 Proceedings of the 13th international conference on Fast Software Encryption
Distinguishing attack on SOBER-128 with linear masking
ACISP'06 Proceedings of the 11th Australasian conference on Information Security and Privacy
Differential fault analysis of Sosemanuk
AFRICACRYPT'11 Proceedings of the 4th international conference on Progress in cryptology in Africa
On the sosemanuk related Key-IV sets
LATINCRYPT'12 Proceedings of the 2nd international conference on Cryptology and Information Security in Latin America
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The SOSEMANUK stream cipher is one of the finalists of the eSTREAM project. In this paper, we improve the linear cryptanalysis of SOSEMANUK presented in Asiacrypt 2008. We apply the generalized linear masking technique to SOSEMANUK and derive many linear approximations holding with the correlations of up to 2-25.5. We show that the data complexity of the linear attack on SOSEMANUK can be reduced by a factor of 210 if multiple linear approximations are used. Since SOSEMANUK claims 128-bit security, our attack would not be a real threat on the security of SOSEMANUK.