Outguess windows software3/12/2023 The goal in this attack is to determine corresponding patterns in the steganography medium that may point to the use of specific steganography tools or algorithms. Chosen-message attack: A known message and steganography tool (or algorithm) are used to create steganography media for future analysis and comparison.Chosen-steganography attack: The steganography medium and tool (or algorithm) are both known.Known-message attack: The hidden message is known.Known-carrier attack: The carrier, that is, the original cover, and steganography media are both available for analysis.Steganography-only attack: Only the steganography medium is available for analysis.An attack approach is dependent on what information is available to the steganalyst (the person who is attempting to detect steganography-based information streams). This is usually done with statistical analysis using advanced statistics techniques.Īttacks and analysis on hidden information may take several forms: detecting, extracting, and disabling or destroying hidden information. ![]() The steganalyst starts by reducing the set of suspect information streams to a subset of most likely altered information streams. Unlike cryptanalysis, where it is evident that intercepted encrypted data contains a message, steganalysis generally starts with several suspect information streams but uncertainty whether any of these contain hidden message. Unless it is possible to fully recover, decrypt and inspect the hidden data, often one has only a suspect information stream and cannot be sure that it is being used for transporting secret information.Some of the suspect signal or file may have noise or irrelevant data encoded into them (which can make analysis very time consuming).The hidden data, if any, may have been encrypted before inserted into the signal or file.The suspect information stream, such as a signal or a file, may or may not have hidden data encoded into them. ![]() The goal of steganalysis is to identify suspected information streams, determine whether or not they have hidden messages encoded into them, and, if possible, recover the hidden information. It is the art of discovering and rendering useless covert messages. Steganalysis is "the process of detecting steganography by looking at variances between bit patterns and unusually large file sizes". Steganalysis is a relatively new research discipline with few articles appearing before the late-1990s.
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