MSN语音流中隐蔽信道的检测方法  

Detection the covert channels based on MSN VoIP

作　　者：黄永峰[1] 袁键[1] 陈书梅 王俊[1] 

机构地区：[1]清华大学电子工程系,北京100084

出　　处：《清华大学学报（自然科学版）》2009年第S2期2200-2207,共8页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(60773140);国家"九七三"重点基础研究项目(2007CB310806)

摘　　要：随着互联网和信息隐藏技术的发展,基于网络协议和流媒体的隐蔽通信软件应用日益广泛。该文针对目前普遍使用的网络通信软件MSN Messenger,研究其中隐蔽通信信道的检测方法。重点探索了微软网络服务(MSN)网络电话(VoIP)语音流的检测方法和语音编码PCM(pulse code modulation)的LSB(least significant bit)信息隐藏算法的检测方法,主要解决了语音流隐蔽通信的在线实时检测问题。该文所提出识别和检测算法,在VoIP流的识别准确率、信息隐藏检测率等方面取得较好结果,能满足实际应用的需要。Covert communications are widely used in network communications and media streams,so detection of the information hidden in these data streams is a key issue in information security.Since microsoft service network(MSN) Messenger is one of the most widely used Internet communication protocols currently,this paper presents method to analyze the features of MSN VoIP(voice over IP) packets to identify convert information.A sliding window method is used to sample the VoIP stream to detect covert communications using steganography on the PCM(pulse code modulation) speech code using the LSB(least significant bit) algorithm.These methods effectively provide real-time online detection of covert communications.Tests demonstrate that these methods achieve better performance,with a high identification ratio for MSN VoIP streams and a high correctness ratio in covert communication detection.Hence,these methods can provide practical steganalyses.

关 键 词：微软网络服务(MSN) VoIP识别 隐蔽通信 信息隐藏 

分 类 号：TP393.09[自动化与计算机技术—计算机应用技术]