摘要： 在SVPN中加密传输压缩数据时，为了减少SVPN网关的加密计算量，可以把压缩数据本身分为关键信息和辅助信息两类，只对关键信息进行加密传输。该文讨论了利用SVPN(以IPSec协议为例)分别对这两类信息进行传输的机制。同时还讨论了在几种常见压缩算法中关键信息和辅助信息的具体划分。

关键词: 安全虚拟专用网络, IPSec, 霍夫曼编码, 自适应量化, 自适应差分脉冲编码, 小波变换

Abstract: When the compressed data in encrypted way is transmitted by using SVPN, it can be divided into two parts: key information and assistant information and only the key information needs to be encrypted. The paper discusses how to use SVPN system (using IPSec protocol) to transmit the two types of information separately,and how to divide the compressed data into key information and assistant information in some common compression arithmetics.

中图分类号: 

• TP393.08