问题

●真正安全的密码系统应是 (64) 。

(64) A.即使破译者能够加密任意数量的明文,也无法破译密文

B.破译者无法加密任意数量的明文

C.破译者无法破译密文

D.密钥有足够的长度

参考答案
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