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x - Faculty of Computer Science - Technische Universität Dresden

x - Faculty of Computer Science - Technische Universität Dresden

x 1 x 2 x 3 . . . x b-1

x 1 x 2 x 3 . . . x b-1 0 S 1 S 2 S 3 . . . S b-1 1 Pathological Block cipher plaintext block (length b) x 1 x 2 x 3 . . . x b-1 1 secure insecure ciphertext block (length b) plaintext block (length b-1) x 1 x 2 x 3 ... x b-1 S 1 S 2 S 3 . . . S b-1 ciphertext block (length b-1) x 1 x 2 x 3 . . . x b-1 0 0 1 pathological 240

Block length a Length of the output unit, a � b r Length of the feedback unit, r � b Addition mod appropriately chosen modulus Subtraction mod appropriately chosen modulus shift register 1 b choose Cipher FeedBack (CFB) encryption encryption key key choose or complete shift register 1 b b b r r b b � n � symmetric; self synchronizing choose or complete choose a a a a a a a a n+1 n+1 n plaintext ciphertext plaintext n+1 241

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