Recent Approaches for VoIP Steganography

Background/Objectives: With the development of data communication, it is essential to find a way to keep the important and secret data during transmission through the internet or mobile communications. Steganography is the most popular technique that is used in information hiding. In steganography, the secret information is embedded inside a cover file or carrier without effect on the quality of that cover file. The carriers used in steganography can be classified into two types: A static digital carrier such as text, image, audio and video files that are applied in digital steganography, and instant or dynamic carrier like an audio stream or network protocol called network steganography. Network steganography is a relatively modern trend in information hiding. It utilizes the development in network functionality and services to convey the secret data. Voice over Internet Protocol (VoIP) is the most common service that is adoptedby researchers in respect to information hiding. Methods/Statistical Analysis: This paper presents a brief review of features, classification and recently proposed network steganography technique. Findings: Many efforts nowadays are exerted to develop the LSBVoIP techniques and adopting other techniques along with LSB to improve the steganography efficiency regarding hiding capacity and imperceptibly.