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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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多选题Which of the following statements are true？ （）ARC4 is a stream cipherBStream ciphers require paddingCAES is a block cipherDDES and 3DES are stream ciphersEAES is a stream cipherFAES， DES， and 3DES can be used as HMAC algorithms
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单选题Which of the following kdb subcommands should be entered to obtain information about a serial port?（）A
ttyB
statC
traceD
stream
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