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x - Faculty of Computer Science - Technische Universität Dresden

x - Faculty of Computer Science - Technische Universität Dresden

Block length a Length

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 shifting register 1 b n Cipher FeedBack (CFB) (2) n+1 n+2 shifting register 1 b b b r r encryption encryption key key b choose or choose or b choose complete complete choose a a a a a a a a n+2 n+1 n n+2 � n+1 n � symmetric; self synchronizing plaintext ciphertext plaintext 242

shift register 1 b CFB for authentication shift register 1 b b r r b key encryption last content of the shift register encryption key � b encrypted choose choose � b comparison ok ? or or last content choose complete complete choose of the shift a a a a register encrypted a a � � plaintext stream plaintext stream 243

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