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
多选题
Which of the following statements are true？ （）
A
RC4 is a stream cipher
B
Stream ciphers require padding
C
AES is a block cipher
D
DES and 3DES are stream ciphers
E
AES is a stream cipher
F
AES， DES， and 3DES can be used as HMAC algorithms
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