Analyse et conception de techniques opérationnelles de stéganographie

Abstract : Steganography is the science of writing hidden messages. In this context, an individual attempts to communicate with an entity without arousing suspicious on the very existence of this communication. This science completes cryptography science (COMmunication SECurity -- COMSEC) when invisibility in addition to security is required. This PhD work, which has been carried out under the guidance and on behalf of the French military headquaters (EMA) deals with different methods allowing the design of a steganography scheme (TRANSmission SECurity -- TRANSEC), technically operational and strong enough to insert a message of approximately ten kilobytes in a JPEG picture of reasonable dimensions, and capable of resisting against attacks given by the state of the art. To make this scheme as safe as possible, the most common data formats are studied (JPEG, BMP, MP3) before defining a first insertion algorithm. This algorithm, based on Hopper's works, is still a proof of concept but allows to define the basis of our new algorithm (named IMEI). The latter maximizes embedding efficiency, and so on, minimizing number of changes applied to the cover-medium. An analysis of HUGO algorithm presented in the context of BOSS challenge gives us the oppportunity to define a steganalysis protocol as well as a second basis for IMEI. The last part of this thesis deals with steganalysis including both IMEI security evaluation, and an operational steganalysis in which we can find a study of a real-life use of steganography and its evaluation.
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Submitted on : Saturday, February 8, 2014 - 10:07:39 AM
Last modification on : Friday, February 21, 2014 - 11:24:27 AM
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Nicolas Bodin. Analyse et conception de techniques opérationnelles de stéganographie. Cryptographie et sécurité [cs.CR]. Ecole Polytechnique X, 2013. Français. ⟨pastel-00943663⟩

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