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| Research of Covert Channels Based on Web Counters |
| HU Wen-tao, XUE Zhi, CHEN Nan |
| (School of Electronic, Information and Electrical Engineering, Shanghai Jiaotong University, Shanghai 200240, China) |
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Abstract To avoid the limits of previous network storage covert channels which transmit covert information generally through packet head manipulation, a new idea was presented by using the plentiful, public Web counters for storage to construct a covert channel. Therefore, the encoder and the decoder do not need to establish a direct network connection, thus avoid the surveillances of many firewalls and intrusion detection system (IDS). A general noisy discrete memoryless channel (DMC) was modeled and the iteration algorithm of the DMC’s capacity was realized by C program language to compute the channel capacity. Several methods such as using multiple counters to increase rate were presented. One technique using pseudorandom sequence to scramble the sending information was used to enhance the covertness and the antinoise capability of the channel. The relationships between parameters and channel’s performance were analyzed through experiment. The result shows that the covert channel is feasible.
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Received: 19 December 2007
Published: 28 October 2008
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Corresponding Authors:
XUE Zhi
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