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Block cipher mode of operation
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=====CFB compared to other modes===== Like CBC mode, changes in the plaintext propagate forever in the ciphertext, and encryption cannot be parallelized. Also like CBC, decryption can be parallelized. CFB, OFB and CTR share two advantages over CBC mode: the block cipher is only ever used in the encrypting direction, and the message does not need to be padded to a multiple of the cipher block size (though [[ciphertext stealing]] can also be used for CBC mode to make padding unnecessary).
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