问题:
A . 3DES is muchmore secure than DES.
B . Both DES and 3DES are stream ciphers.
C . DES uses 64 bitkeys, although the effective key lengthis only 56bits.
D . The decryption operation for both DES and 3DES is the same as the encryption operation.
E . DES can only be used for encryption, whereas 3DES can also be used for authentication.
● 参考解析
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