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在基于用户身份认证的校园网计费系统中，确认用户身份、防止ＩＰ盗用是一个很重要的问题。此文以校园网身份认证系统为例，就原理和实现两个方面做出了详细讨论。
In the campus network charging system based on user identity authentication, it is a very important issue to confirm the user identity and prevent IP theft. This article takes the campus network authentication system as an example to discuss in detail two aspects of principle and realization.