DST approach to enhance audio quality on lost audio packet steganography

Abstract

Lost audio packet steganography (LACK) is a steganography technique established on the VoIP network. LACK provides a high-capacity covert channel over VoIP network by artificially delaying and dropping a number of packets in use to convey stegnogram. However, the increasing loss of packets will hurt the quality of the VoIP service. The quality deterioration will not only affect the legitimate VoIP service but also constrain the capacity of the covert channel. Discrete spring transform (DST) is proven to be a way to eliminate the perceptual redundancy in the multimedia signal. In this paper, the DST is applied on the LACK so that the perceptual redundancy of the voice frames is suppressed. In this way, the less redundant VoIP frames with perceptual equivalent quality can be transmitted in a channel whose capacity is squeezed by the established covert channel. As a result, the VoIP perceptual quality can be maintained with the existence of the covert channel. Meanwhile, the proposed DSTbased method demonstrates the possibilities in exploiting the perceptual space of the multimedia signal. The simulation results show that the DST on LACK achieves up to 24 % more capacity over the LACK scheme.

VoIP Steganography Methods, a Survey

“…LACK [1] method, which used the packet loss as an advantage and created space in hidden communication channels by forcing packet loss and introduces redundant frames with secret messages embedded in it. Q i, P e n g and S h a r i f [13] in 2016 worked on the technique LACK proposed by M a z u r c z y k and L u b a c z [1], The original method embedded the secret message by forced loss of VoIP frames and introduced redundant frames with secret message embedded in it. As a result, the number of redundant frames was increased.…”

High capacity speech steganography for the G723.1 coder based on quantised line spectral pairs interpolation and CNN auto-encoding

“…DWT-based speech steganography is introduced in [6]. The discrete spring transform (DST) is used in [39] within a scheme called DST-LACK, which is a speech-in-speech steganography that reduces the effect of packet loss caused by the LACK covert channel scheme [31] to make the latter method less detectable.…”

Covert Communication Over VoIP Streaming Media With Dynamic Key Distribution and Authentication

“…In 2016, Qi et al used Discrete Spring Transform to eliminate redundancy in multimedia signals and improve speech quality [18]. Liu et al reported the use of a matrix embedding method to achieve steganography in linear predictive coding for low bit-rate speech codec [19].…”