In Chapter 3, we showed you different techniques and tools to conceal data inside digital images.
Digital images commonly exchanged between Internet users make it less suspicious when concealing data inside them. Nihad Ahmad Hassan, Rami Hijazi, in Data Hiding Techniques in Windows OS, 2017 Image Forensicsĭigital images are still the most used medium for concealing data digitally. Hash sets are databases of MD5 hashes of known unique files associated with a particular application. Steganography hash sets are also available within the NIST database of hash sets. It works by both searching for known stego artifacts as well as by searching for the program files associated with over 650 steganography toolsets. StegAlyzerAS is a tool created by Backbone Security to detect steganography on a system. Another method is to hide images behind other images using the layers feature of some photo enhancement tools, such as Photoshop. Forensic tools will allow the analyst to locate this text, but on opening the file the text won’t be readily visible. In Microsoft Word, text boxes can be placed right over the top of other text, formatted in such a way as to render the text undetectable to a casual observer.
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Other, more manual stego techniques may be as simple as hiding text behind other text. Then comes the arduous task of locating 11 of the files that may possibly contain hidden data. The most common way that steganography is discovered on a machine is through the detection of the steganography software on the machine. Some of these do it by simply appending the “hidden” file at the tail end of a JPEG file and then add a pointer to the beginning of the file.
For example, there are a number of stego software tools that allow the user to hide one image inside another. Steganography tools provide a method that allows a user to hide a file in plain sight. Ellis, in Managing Information Security (Second Edition), 2013 Steganography “Covered Writing”
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