Steganography of VoIP Streams
Steganography of VoIP Streams
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DOI：
10.1007/978-3-540-88873-4_6
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发表时间：
2008-05
期刊：
影响因子：
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通讯作者：
W. Mazurczyk;K. Szczypiorski
中科院分区：
文献类型：
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作者：
W. Mazurczyk;K. Szczypiorski
本文关注现有的隐写技术，可用于创建隐蔽的通道VoIP（语音互联网协议）流。除了描述现有的隐写方法之外，我们还通过提出两种新技术提供了新的见解。第一种是网络隐写解决方案，其利用空闲/未使用的协议的字段，并且已知用于IP、UDP或TCP协议，但从未应用于RTP（实时传输协议）和RTCP（实时控制协议），这是VoIP的特征。第二种方法，称为LACK（丢失的音频数据包隐写），提供混合存储定时隐蔽通道，利用延迟的音频数据包。本文还包括实验结果，该实验是为了估计在典型的VoIP对话阶段可以秘密传输的数据总量，无论隐写分析如何。
The paper concerns available steganographic techniques that can be used for creating covert channels for VoIP (Voice over Internet Protocol) streams. Apart from characterizing existing steganographic methods we provide new insights by presenting two new techniques. The first one is network steganography solution which exploits free/unused protocols’ fields and is known for IP, UDP or TCP protocols but has never been applied to RTP (Real-Time Transport Protocol) and RTCP (Real-Time Control Protocol) which are characteristic for VoIP. The second method, called LACK (Lost Audio Packets Steganography), provides hybrid storage-timing covert channel by utilizing delayed audio packets. The results of the experiment, that was performed to estimate a total amount of data that can be covertly transferred during typical VoIP conversation phase, regardless of steganalysis, are also included in this paper.