Lost audio packets steganography: the first practical evaluation
Wojciech Mazurczyk · Security and Communication Networks · 2012
ABSTRACT This paper presents first experimental results for an Internet Protocol (IP) telephony‐based steganographic method called lost audio packets steganography (LACK). This method utilises the fact that in typical multimedia communication protocols such as Real‐time Transport Protocol, excessively delayed packets are not used for the reconstruction of transmitted data at the receiver; that is, these packets are considered useless and discarded. The results presented in this paper were obtained on the basis of a functional LACK prototype and show the method's impact on the quality of voice transmission. Achievable steganographic bandwidth for the different IP telephony codecs is also calculated. Copyright © 2012 John Wiley & Sons, Ltd.