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Suppose that, in PCBC (Plaintext Cipher Block Chaining) mode, blocks C_i and C_(i+1) are interchanged during...

Suppose that, in PCBC (Plaintext Cipher Block Chaining) mode, blocks C_i and C_(i+1) are interchanged during transmission. Show that this affects only the decrypted blocks P_i and P_(i+1)but not subsequent blocks.
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