Modeling and Simulation of Covert Channel Based on Network Packet Length
Wang Zhi-quan · Jisuanji fangzhen · 2010
Research of covert channel is of great significance not only because it is an important tool of network steganography,but also it is a frequently used mean to steal information by hacker.Packet length covert channel was proposed,hiding information with the length of network packet.And channel capacity,robustness,safety and undetectability were proposed to assess a covert channel.Because of avoidance of hiding message by the delay of sending packet,the capacity of packet length covert channel is much larger than traditional covert time channel.Moreover,the changing of network structure and the quality of network may make the covert time channel out of work.But these factors cannot play a role in packet length covert channel,so that the robust of packet length covert channel is better than covert time channel.Hence,covert channel by packet length is a more stability and useful tool of covert communication.The detection algorithms by packet length based on neuron net could work well to eliminate the risk of covert channel.