单选题Stream ciphers run on which of the following？（）AFixed-length groups of digits called blocksBIndividual blocks，one at a time，with the transformations varying during the encryptionCIndividual digits，one at a time，with the transformations varying during the encryptionDFixed-length groups of bits called blocks
单选题
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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