Research on Covert Channels Based on Multiple Networks

Abstract

Covert channel is a kind of method, used to transmit message secretly usually. Till now, most covert channel uses one network with protocol header or filter bits, time interval of packets etc. With the development of networks, using multiple networks transmit data getting more common. In this paper, a new kind of covert channel is proposed using multi-networks to transmit ciphertext. One is used to transmit key, and the others are used to transmit ciphertext. In the experiment, the key is transmitted with 3G network, while the cipher using WiFi network in the covert channel. For making the covert channel more robust, we use one time padding to encrypt our message. We also measure the accuracy with different transmission speed. The result shows that the covert channel we propose has high accuracy with different transmission speed.