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x - Faculty of Computer Science - Technische Universität Dresden

x - Faculty of Computer Science - Technische Universität Dresden

Expansion Use key S 1

Expansion Use key S 1 Mixing S 2 S 3 S 4 Encryption function f R i-1 32 E P 48 48 S 5 32 32 f(R i-1, K i) 48 S 6 K i S 7 S 8 Terms Make f (and DES) nonlinear (permutations and � are linear) • Substitution-permutation networks • Confusion - diffusion 228 “substitution box” S can implement any function s : {0,1} 6 � {0,1} 4 , for example as table. For DES, the functions are fixed.

Generation of a key for each of the 16 rounds 64-bit key (only 56 bits in use) 28 28 C 0 LS 1 C 1 LS 2 C 2 C 16 PC-1 D 0 LS 1 D 1 LS 2 D 2 D 16 PC-2 56 48 PC-2 PC-2 choose 48 of the 56 bits for each key of the 16 rounds K 1 K 2 K 16 229

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