\section{Conclusion}
+This work has reviewed the evolution of chaos based data hiding schemes.
+The whole class of algorithms has been formally presented and implemented.
+Two watermarking processes ($\mathcal{CIW}_1$ and $\mathcal{CIS}_2$) have been
+recalled; the former is a one-bit approach whereas the latter allows to
+embed any message of reasonable size.
+The two schemes have been
+theoretically evaluated: both are stego-secure and verify the
+topological expansiveness property.
+These two scheme has been practically evaluated: they have been proven to be
+robust against a large class of attacks.
+Finally, $\mathcal{DI}_3$ which adapts the $\mathcal{CIS}_2$ scheme to
+the steganography field. It capacity to resists to steganalysis has been
+evaluated and has shown promissing results.
+
+To summarize, this works has presented three
+chaos based data hiding schemes and has study their security.
+In a future work we plan to combine these approaches to other data hiding
+schemes to take benefit of their best behaviors:
+for instance the pixel selection may be achieved by state of the art
+distortion function and modifications may be delayed to chaos
+based schemes.
+
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