A New Network Covert Channel Based on Web Access Model

Network covert channel is a transmission scheme which hides the confidential information to normal network channel.Network covert timing channel does not modify the network packets,therefore it is more difficult to detect and more dangerous.This paper presents a new network covert timing channel based on Web access model.Malicious users transfer the confidential information by regularly access the Web server in this channel.We implement the prototype of the covert channel,and analyze the channel performance.