实现vpn应用，代码完整，是课程设计的最好选择-Implement vpn application, code integrity is the best choice for curriculum design

一个控制本地机器上网，主要用于ccProxy代理人的程序源代码的完整性适配器，可直接使用。-A local machine access control, mainly for ccProxy agent program source code integrity adapter can be used directly.

A digital signature is a mathematical scheme for demonstrating the authenticity of a digital message or document. A valid digital signature gives a recipient reason to believe that the message was created by a known sender, such that the sender canno