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Consider a block cipher that is used in cipher block chaining mode. Suppose that during transmission,...

Consider a block cipher that is used in cipher block chaining mode. Suppose that during transmission, Ci , the i-th ciphertext block, is corrupted. How many plaintext blocks will be affected? Answer the same question for the case of cipher feedback mode.

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Answer #1

Note: Done accordingly. Please comment for any problem. Please Uprate. Thanks.

In Cipher block chaining mode if one ciphertext block is damaged, only two received plaintext blocks will be damaged.

As shown in figure suppose block underlined by red is corrupted then that block and next block is affected only.

Same is with CFB mode as shown below in decryption of CFB:

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