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
正确答案:A,C
答案解析:有
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