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15 5. In 8-bit CFB mode, if one bit of a ciphertext block is corrupted during transmission, how many blocks in total will be affected in decryption assuming DES is used? The error will affect the decryption of the ciphertext block. In addition, the error block will stay in the IV for another 64/8=8 blocks. In total, 9 blocks will be affected.
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19 Answer to Problem 4.2: IV will be the first block to be repeated. To see this, note
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