Concealed in the Internet: A Novel Covert Channel with Normal Traffic Imitating
Xiaorong Lu, Liusheng Huang, Wei Yang, Yao Shen · 2016
Covert channel in network protocols has been an area absorbing great interests for many years in secret transmission. Recently, covert channels based on packet length have become a new preference among researchers in this field because of their excellent performance in simulating statistical features of network packets in real world. However, few approaches which can embed secret information with great security ensured has been worked out by so far. Therefore, in this paper, we analyze the traffic stream of UDP packets, several storage features of data files, then propose a novel network steganography scheme based on IP address, UDP packet length in order to overcome the drawbacks of existing schemes. A comprehensive set of corresponding experiment results show that the proposed covert channel follows the normal traffic statistical features well, thus ensures more security than that of the existing algorithms.