| (I) An encryption algorithm that breaks plaintext into fixed-size
segments and uses the same key to transform each plaintext segment
into a fixed-size segment of ciphertext. (See: mode, stream
cipher.)
(C) For example, Blowfish, DEA, IDEA, RC2, and SKIPJACK. However,
a block cipher can be adapted to have a different external
interface, such as that of a stream cipher, by using a mode of
operation to "package" the basic algorithm.
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