Information hiding methods research and improvement based on FTP protocol
LI Caiqi · Computer Engineering and Applications Journal · 2013
Two methods of protocols steganography are discovered by using FTP protocol commands based on the study of FTP protocol. The characters of covert channels, which are bandwidth, sneakiness and robustness, based on the two methods are analyzed. In addition, the covert channel based on the classification of command sequence length of FTP protocol has been improved. The methods before and after the improvement are compared. The conclusion proves that the improved method has improved the bandwidth greatly.