On the undetectability of transcoding steganography

Abstract

Transcoding Steganography (TranSteg) is a fairly new IP telephony steganographic method that is characterized by a high steganographic bandwidth, low introduced distortions, and high undetectability. TranSteg utilizes compression of the overt data to free space for the secret data bits. In this paper, we focus on evaluating different possibilities for TranSteg detection. Building on the previous works, we perform a wide analysis of different steganalysis methods to assess the possibility of TranSteg detection and identify the most 'undetectable' pairs of voice codecs.