Research on Construction Methods for Network Covert Channels Based on HTTP
Ran Zhang, Yong Gan, Yifeng Yin · Applied Mechanics and Materials · 2012
Network covert channel is a steganography technology that uses network traffic data as a carrier to transfer the secret data. This paper analyzes the working principle of network covert channels, and summarizes the commonly used construction technology of network covert channels. Then it analyzes the characteristics of the HTTP header lines and gives some methods of constructing network covert channels with these characteristics. Network covert channels based on the HTTP header lines are simple, flexible, and difficult to be detected and shielded.