Chokri CHEMAK was born in CHEBBA, Tunisia, in 1978. He received the Master degree from the National Engineering School of Sfax, Tunisia, in June 2005. Since September 2005, he was been an Assistant Professor of Computer Science in the High Institute of Computer Sciences, Mahdia, Tunisia. Currently, he is studding for the Ph.D. degree. He is a member of the Distributed System Team in the Computer Science Laboratory of Franche-Comte (L.I.F.C.), French. He is also, a member of the R.U.: Sciences and Technologies of Image and Telecommunications (SETIT), Tunisia. He is a member of the organisation committee of the IEEE International Conference: Sciences of Electronic, Technologies of Information and Telecommunication: (SETIT 2005 and SETIT 2007). His research interests include image processing (including Watermarking and data hiding and information Security).