Review and Comparison of Network Steganography Methods Based On Different Classifications

The growth of Internet and computer networks has led to the ease of information transfer. This development has also caused some problems due to the fact that in network environments, data may be snooped while transferring from the sender to the receiver. So, it is always necessary to provide information security and in order to achieve this goal, steganography plays an important role. Network steganography is a method that uses network protocols. Many techniques for network steganography have been suggested up to this time so that familiarity with different algorithms, as well as recognizing the advantages and disadvantages of each of them, are required for researchers in this field who wish to introduce a new approach to steganography or to propose a new method of steganalysis. In this paper, it has been attempted to describe the various ideas behind network steganography methods in terms of two different classifications, and the result of the research have been presented. Although it would be ideal to devise a method which satisfies the three steganography evaluation criteria: capacity, undetectability and robustness simultaneously, but bearing in mind the conflict between them, a method can be proposed for each application which excels in the criterion that is most relevant in that application.