A(n)______ allows users to scramble and unscramble their messages easily without a third partyintruding.

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问题 A(n)______ allows users to scramble and unscramble their messages easily without a third partyintruding.

选项 A、DES
B、signing messages
C、encrypt
D、firebreak

答案A

解析 用户可以使用DES算法进行消息的加密和解密,以防止第三方的入侵。
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