-\section{Analysis of Steganographic Approaches}
-\input{analysis.tex}
-
-This work considers digital images as covers and fondation is
-spatial least significant-bit (LSB) replacement.
-I this data hiding scheme a subset of all the LSB of the cover image is modified
-with a secret bit stream depending on to a key, the cover, and the message to embed.
-This well studied steganographic approach never decreases (resp. increases)
-pixel with even value (resp. odd value) and may break structural symetry.
-This structure modification is detectable by statistical approaches
-and thus by steganalysis methods~\cite{Dumitrescu:2005:LSB:1073170.1073176,DBLP:conf/ih/2005,FK12}.
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-random LSB selection: coarse, easily tractable, easilly detactable
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-feature-based : precise but time consuming