1. For the data transportation security, VPN technology which is very popular in the market is discussed. Several primary protocols are compared with one another from the point of view of implementation. And also, the implementing model of IPSec_based VPN enciphers is introduced.
针对数据传输安全，论述目前在安全市场上需求极大的VPN技术，从实现角度比较占主导地位的几种协议，介绍基于IPSec的VPN密码机实现模型。