By Thomas Johansson, Willi Meier, Frédéric Muller (auth.), Matthew Robshaw (eds.)

Fast software program Encryption (FSE) 2006 is the thirteenth in a sequence of workshops on symmetric cryptography. it's been subsidized for the final ?ve years via the overseas organization for Cryptologic learn (IACR), and former FSE workshops were held worldwide: 1993 Cambridge, united kingdom 1994 Leuven, Belgium 1996 Cambridge, united kingdom 1997 Haifa, Israel 1998 Paris, France 1999 Rome, Italy 2000 manhattan, united states 2001 Yokohama, Japan 2002 Leuven, Belgium 2003 Lund, Sweden 2004 New Delhi, India 2005 Paris, France The FSE workshop is dedicated to investigate on speedy and safe primitives for symmetric cryptography, together with the layout and research of block ciphers, move ciphers, encryption schemes, research and overview instruments, hash fu- tions, and message authentication codes. This 12 months greater than a hundred papers have been submitted to FSE for the ?rst time. After an in depth overview by means of the ProgramCommittee, 27 papers have been awarded on the workshop. after all, the programwould now not were whole with no the invited speaker, and the presentation by way of Eli Biham at the early heritage of di?erential cryptanalysis was once rather favored by means of workshop attendees.

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Additional resources for Fast Software Encryption: 13th International Workshop, FSE 2006, Graz, Austria, March 15-17, 2006, Revised Selected Papers

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Given a real function of m binary variables f (x1 , . . , xm−1 ), the Walsh transform of f is the real function of m binary variables F = W (f ) defined by: f (x0 , . . +um−1 xm−1 . F (u0 , . . ,xm−1 ∈{0,1}m Let us define the function s(α0 , . . , αm−1 ) by: j ∈ {1, . . , M } (αj0 , . . , αjm−1 ) = (α0 , . . , αm−1 ) ∧ bj = 1 − j ∈ {1, . . , M } (αj0 , . . , αjm−1 ) = (α0 , . . , αm−1 )∧ bj = 0 . The function s can be computed in M steps. e. ∀(y0 , . . , ym−1 ) ∈ {0, 1}m, W (s)(y0 , . .

Grain - A Stream Cipher for Constrained Environments. ECRYPT Stream Cipher Project Report 2005/001, 2005. org/stream. 12. M. Hell, T. Johansson, and W. Meier. Grain - A Stream Cipher for Constrained Environments, 2005. se/grain. 13. T. Johansson and F. J¨ onsson. Fast correlation attacks based on turbo code techniques. In Advances in Cryptology—CRYPTO’99, volume 1666 of Lecture Notes in Computer Science, pages 181–197. Springer-Verlag, 1999. 14. T. Johansson and F. J¨ onsson. Improved fast correlation attacks on stream ciphers via convolutional codes.

The keystream generation process and the key/IV setup are illustrated in Sect. 2, respectively. 1 Keystream Generation The keystream generation diagram of DECIM is given in Fig. 1. DECIM has a regularly clocked LFSR which is defined by the feedback polynomial P (X) = X 192 + X 189 + X 188 + X 169 + X 156 + X 155 + X 132 + X 131 + X 94 + X 77 + X 46 + X 17 + X 16 + X 5 + 1 over GF (2). The related recursion is given as s192+n = s187+n ⊕ s176+n ⊕ s175+n ⊕ s146+n ⊕ s115+n ⊕ s98+n ⊕ s61+n ⊕ s60+n ⊕ s37+n ⊕ s36+n ⊕ s23+n ⊕ s4+n ⊕ s3+n ⊕ sn .

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