虚拟专用网络(VPN)中的IPSec协议不能解决通信各方的身份认证间题.为此,在VPN中引入PKI认证技术,描述PKI在VPN中的应用,包括身份认证、密钥管理和访问控制3个方面,给出PKI在VPN中的配置模型与功能模型,并对VPN用户数字签名的实现过程进行分析.%Referring to unbalanced dataset, the traditional machine learning methods will achieve biased performance. Using traditional methods, the recognition rate of minority class will be lower than the recognition rate of majority class. In this paper, based on rotation forest, it proposes an improved unbalanced dataset learning method, which is called deflection forest. It reduces data unbalance by over-sampling the data of minority class. It uses random resampling to increase diversity of samples which generate the deflection matrix and then improves the accuracy rate. Experimental results show that the deflection forest method achieves better performance, which carries out higher recognition rate of minority class and also lower recognition error rate of majority class.
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