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x - Faculty of Computer Science - Technische Universität Dresden

x - Faculty of Computer Science - Technische Universität Dresden

Cipher Block Chaining

Cipher Block Chaining (CBC) (2) All lines transmit as many characters as a block comprises Addition mod appropriately chosen modulus Subtraction mod appropriately chosen modulus bit error plaintext block n n+1 n+2 memory for ciphertext block n-1 n+2 n+1 n n+2 n+1 n n+2 n+1 n n key key � � encryption decryption ciphertext block n useable for authentication � use last block as MAC memory for ciphertext block n-1 238 1 modified plaintext bit � from there on completely different ciphertext plaintext block n

� plaintext block n memory for ciphertext block n-1 CBC for authentication ciphertext block n key key � memory for ciphertext block n-1 encryption encryption last block � � ciphertext block n last block comparison plaintext 239 ok ?

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