GiLBCSteg: VoIP Steganography Utilizing the Internet Low Bit-Rate Codec
Garrett Calpouzos, Cihan Varol · Computer Science and Information Technology · 2013
GiLBCSteg is a steganography algorithm that utilizes an open source low bit-rate audio codec (iLBC) to be used in Voice over Internet Protocol (VoIP) applications. The GiLBCSteg achieves this by hiding data within the compression process of audio signals, a required step in successful live VoIP applications. Specifically, GiLBCSteg is the first study in the literature that alters the linear spectral frequencies indices used by iLBC to encode hidden data within the audio signal. This encoding algorithm not only produces mild distortion, less than 5 dB in difference which is not readily noticeable to the human ear, but also do not transmit the hidden message as a separate file.