Steganography, meaning hidden writing, is the technique of concealing secret information into another cover-media, such as audio, video, image and text, in such a manner that the very existence of the information is camouflaged. Unlike the goal of cryptography, which prevents the data from illicit access and modification by transforming the secret data into messy and meaningless bit-streams, the aim of steganography is to conceal their very existence such that the embedded data is inaudible or invisible to the grabbers.
For a long time, information hiding has focused on carriers like images and audio files. A problem with these carriers is that they do not support hiding in new types of network-based services. Nowadays, these services often arise as a consequence of