A Wireless Covert Channel Based on Constellation Shaping Modulation

作者：Cao, Pengcheng; Liu, Weiwei; Liu, Guangjie^*; Ji, Xiaopeng; Zhai, Jiangtao; Dai, Yuewei

来源：Security and Communication Networks, 2018, 2018: UNSP 1214681.

DOI：10.1155/2018/1214681

• Communication reliabilities
• Constellation errors
• Constellation points
• Constellation shaping
• Covert communications
• Covert timing channels
• OFDM-based communication systems
• Statistical detection

Wireless covert channel is an emerging covert communication technique which conceals the very existence of secret information in wireless signal including GSM, CDMA, and LTE. The secret message bits are always modulated into artificial noise superposed with cover signal, which is then demodulated with the shared codebook at the receiver. In this paper, we first extend the traditional KS test and regularity test in covert timing channel detection intowireless covert channel, which can be used to reveal the very existence of secret data in wireless covert channel from the aspect of multiorder statistics. In order to improve the undetectability, a wireless covert channel for OFDM-based communication system based on constellation shaping modulation is proposed, which generates additional constellation points around the standard points in normal constellations. The carrier signal is then modulated with the dirty constellation and the secret message bits are represented by the selection mode of the additional constellation points; shaping modulation is employed to keep the distribution of constellation errors unchanged. Experimental results show that the proposed wireless covert channel scheme can resist various statistical detections. The communication reliability under typical interference is also proved.

• 出版日期2018
• 单位南京理工大学; 江苏科技大学