题目内容

以下哪种机制可在无信息传输时,通过发送伪随机序列信号,使非法监听者无法知道哪些是有用信息,哪些是无用信息:( )

A. 公证机制
B. 鉴别交换机制
C. 业务流量填充机制
D. 路由控制机制

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