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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。
When encrypting and transmitting compressed data in SVPN, in order to reduce the amount of encrypted computation of the SVPN gateway, the compressed data itself can be divided into two kinds of key information and auxiliary information, and only the key information is encrypted and transmitted. This paper discusses the mechanism of using SVPN (using IPSec protocol as an example) respectively to transmit these two types of information. Also discussed in several common compression algorithm, the specific division of the key information and auxiliary information.