VoIP Steganography and Its Detection - A Survey
It addresses the security challenge of covert communication in VoIP for researchers and practitioners, but it is incremental as it is a survey rather than presenting new findings.
This survey paper examines the problem of steganography in VoIP (steganophony), which involves hiding secret information in voice-over-IP communications, and reviews existing methods for both implementing and detecting such hidden data.
Steganography is an ancient art that encompasses various techniques of information hiding, the aim of which is to secret information into a carrier message. Steganographic methods are usually aimed at hiding the very existence of the communication. Due to the rise in popularity of IP telephony, together with the large volume of data and variety of protocols involved, it is currently attracting the attention of the research community as a perfect carrier for steganographic purposes. This paper is a survey of the existing VoIP steganography (steganophony) methods and their countermeasures.