| (I) An block cipher mode that enhances electronic code book mode
by chaining together the blocks of ciphertext it produces and
operating on plaintext segments of variable length less than or
equal to the block length. [FP081]
(C) This mode operates by using the previously generated
ciphertext segment as the algorithm's input (i.e., by "feeding
back" the ciphertext) to generate an output block, and then
combining (exclusive OR-ing) that output block with the next
plaintext segment (block length or less) to form the next
ciphertext segment.
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