A Novel Covert Timing Channel Based on RTP/RTCP  

作　　者：YING Lizhi HUANG Yongfeng YUAN Jian LINDA Yunlu Bai 

机构地区：[1]Institute of Information Cognition and Intelligence System,Department of Electronic Engineering,Tsinghua University,Beijing 100084,China

出　　处：《Chinese Journal of Electronics》2012年第4期711-714,共4页电子学报（英文版）

基　　金：This work is supported in part by the National Natural Science Foundation of China （No.60703053, No.60773140）, and Independent Scientific Research Programs of National Education Ministry （No.20111081023）.

摘　　要：A covert timing channel utilizes temporal features to transfer secret messages. This paper proposes a framework of network covert timing channels based on information theory to measure their capacity and efficiency. Different from many former channels constructed upon a single transport layer protocol, the paper designs and implements a novel covert timing channel based on RTP and RTCP which both belong to the application layer. The channel utilizes Run Length Code and Multi-Zero Code to improve imperceptibility and robustness. The evaluation and test results show that the channel is superior in covert communication for it is quite robust against jitter and packet loss with high imperceptibility.

关 键 词：STEGANOGRAPHY Covert timing channel Real time protocol/Real time transmission protocol （RTP/RTCP） Information theory. 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术] TP37[自动化与计算机技术—计算机科学与技术]