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x - Faculty of Computer Science - Technische Universität Dresden

x - Faculty of Computer Science - Technische Universität Dresden

plaintext block n

plaintext block n Electronic Codebook (ECB) key bit error key encryption n+1 n decryption n+1 n ciphertext plaintext block n block n 236

Cipher Block Chaining (CBC) All lines transmit as many characters as a block comprises Addition mod appropriately chosen modulus Subtraction mod appropriately chosen modulus plaintext block n memory for ciphertext block n-1 key bit error key � � encryption decryption ciphertext block n n+1 memory for ciphertext block n-1 237 n+2 n+1 n n+2 n+1 n n+2 n+1 n self synchronizing n If error on the line: Resynchronization after 2 blocks, but block borders have to be recognizable plaintext block n

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