  Recently, merging signal processing techniques with information security
services has found a lot of attention. Steganography and steganalysis are among
those trends. Like their counterparts in cryptology, steganography and
steganalysis are in a constant battle. Steganography methods try to hide the
presence of covert messages in innocuous-looking data, whereas steganalysis
methods try to reveal existence of such messages and to break steganography
methods. The stream nature of audio signals, their popularity, and their wide
spread usage make them very suitable media for steganography. This has led to a
very rich literature on both steganography and steganalysis of audio signals.
This paper intends to conduct a comprehensive review of audio steganalysis
methods aggregated over near fifteen years. Furthermore, we implement some of
the most recent audio steganalysis methods and conduct a comparative analysis
on their performances. Finally, the paper provides some possible directions for
future researches on audio steganalysis.
