流量分析即通过监测通信方以及传输的数据量来收集关于消息或协议的信息。
Traffic analysis attacks attempt to glean information about a message or protocol by observing which parties are talking to whom, and in some cases how much data is being transferred.
不同的网络变量，比如传输协议、带宽和流量。
Various network variables such as transport protocol, bandwidth, and traffic.
小型传输，开销很小(固定长度的头部是2字节)，协议交换最小化，以降低网络流量。
A small transport overhead (the fixed-length header is just 2 bytes), and protocol exchanges minimised to reduce network traffic.
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