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Some block cipher modes of operation only use encryption because the input is set to

some initialization vector and the leftmost bits of the output of the encryption function

are XORed with the first segment of plain text p1 to produce the first unit of cipher text

C1 and it is transmitted. While in decryption, the cipher text is XORed with the output of

the encryption function to produce the plain text.

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Q: Why do some block cipher modes of operation only use encryption while others use both encryption and decryption?
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