【摘要】 通过对FTP协议进行研究,提出了两种基于FTP协议的信息隐藏方法,分析了两种信息隐藏方法的安全性、隐藏容量、鲁棒性。对基于FTP协议的分级序列长度隐蔽信道进行了改进,对改进前后两种方法进行了比较,使隐藏容量大幅度提高。更多还原

【Abstract】 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.更多还原