单项选择题

A.Fixed-length groups of digits called blocksB.Individu……

Stream ciphers run on which of the following？（）

A.Fixed-length groups of digits called blocks
B.Individual blocks，one at a time，with the transformations varying during the encryption
C.Individual digits，one at a time，with the transformations varying during the encryption
D.Fixed-length groups of bits called blocks

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