Evaluating the Transmission Rate of Covert Timing Channels in a Network

Publication year: 2011
Source: Computer Networks, In Press, Accepted Manuscript, Available online 13 June 2011

Xiaochao, Zi , Lihong, Yao , Xinghao, Jiang , Li, Pan , Jianhua, Li

Network covert channel is an illegal communication mechanism, which can be used by attackers to steal information from compromised systems. The channel brings serious security threat, which is usually measured by the information transmission rate achieved in the channel. In this paper, we focus on evaluating the transmission rate achieved by potential covert timing channels in a network. In such channels, the delay jitter and loss of media packets correspond to the communication noise, and impacts the error probability of the channel communication. Based on the analysis of the network status (e.g. delay jitter, packet loss), we propose a method…

 Highlights: ► We propose a method to evaluate the maximum transmission rate over covert channels. ► The evaluation method is based on the network status instead of transmission schemes. ► Actual channel construction and transmission process are unnecessary in the method.