Keynote Lectures

The applicability of Information Centric Network to the Internet of Things

Prof. AMINE DHRAIEF, Higher School Of Digital Economy, University of Manouba, Tunisia.

Hermitian codes and restricted Hermitian codes: their parameters, automorphisms, implementations and applications in the McEliece cryptosystem

Prof. Gábor P. Nagy, Budapest University of Technology , Hungary.

 For safe and secure communication and data storage, we must be able to correct errors which are caused either by some random noise or by pollution attacks of an adversary. The largest class of error correcting codes with good parameters and an effective decoding algorithm is formed by the algebraic geometric (AG) codes. This class contains the Reed-Solomon codes and many generalizations of them. The construction of an AG code is based on an algebraic curve X over a finite field GF(q). The investigations require methods from the theory of function fields, finite geometry and group theory. In our research we focus on Hermitian curves, which are the best known class of nontrivial maximal curves. In my talk, I will present some recent results on bounds of the minimum distance of Hermitian curves; here the main tool is the understanding of the structure of the Weierstrass semigroup at higher degree places and divisors. I will make special focus on the software implementation techniques of the computation of the generator matrix of Hermitian codes and of the decoding algorithm. In the second part of the talk, I will deal with subfield subcodes of Hermitian codes. Here, the main question is if we can produce binary codes for the McEliece Cryptosystem with better parameters than the binary Goppa codes.

A Survey of 3D Reconstruction

Prof. Khalid SATORI, Sidi Mohamed Ben Abdellah University, Fez - Morocco

3D reconstruction from images is an important and widely studied axis in recent decades. Its importance is reflected in the diversity of its application fields, namely: robotics, quality control, surveillance, medicine, shape recognition, augmented reality, video games, and others. There are several approaches of three-dimensional perception of the environment, however, the main approaches used are: reconstruction from silhouettes, reconstruction from texture, reconstruction from camera movement and reconstruction from epipolar geometry:
Reconstruction from Silhouettes: Used in multi-camera environments, called "Shape from Silhouette", it makes an all-encompassing estimate of the 3D shape and visual envelope of interest objects. Usually two types to distinguished, surface and volume in real time.
The reconstruction from texture: called "Shape from texture". Approaches of this type estimate the shape of objects from observed variations in texture. However, objects that will be rebuilt must be textured.
The reconstruction from camera movement: called "Shape from motion", allows recovering the three-dimensional structure from a displacement vector field, indicating the projection of an object or scene in motion, in image planes.
Reconstruction from epipolar geometry: called "Shape from epipolar geometry", the methods of this category are the most used in the field of computer vision. The main difficulty of these techniques results from the problem of the matching of the points between image couples. But once the matching is discerned for each couple of points from the two ordinary views, these points can be triangulated to estimate the 3D points of the homologous scene.

Prof. Khalid Satori received the PhD degree from the National Institute for the Applied Sciences INSA at Lyon in 1993.  He received the Thesis of doctorate of State in Science at Faculty of Sciences of Fez in 1999. He is currently a professor of higher education of computer science at USMBA-Fez University. He is the director of the LIIAN Laboratory and the Head of Department of Computer Science at the Faculty of Science of Fez. His research interests include real-time rendering, Image-based rendering, virtual reality, biomedical signal, camera self calibration and 3D reconstruction.

 Introduction to Security Proofs in Cryptography

                                    Prof. Hussain Ben-azza, ENSAM, University of Moulay Ismail, Meknes, Morocco. 

Quasi-periodicity, chaos and coexistence in the time delay controlled two-cell DC-DC buck converter

Prof. Moez Feki, University of Sousse, Tunisia

Power converter interface devices are important for using energy storage systems (ESSs) in microgrids. With the development of power electronics technology, many different power converters have emerged. DC-DC converters have been used long before their behavior is completely understood. Indeed, it's only on late eighties that the existence of chaotic behavior in power converters has been reported. In this work, we present a modeling method and a thorough analysis of different scenarios leading to bifurcation and chaos. We show that the time delay controlled two-cell DC/DC buck converter, in addition to border collision bifurcation, may also exhibit a Neimark-Sacker bifurcation which for some parameter set may lead to a 2D Torus that may then break yielding a chaotic behavior. Besides, the saturation of the controller can also lead to the coexistence of a stable focus and a chaotic attractor. The results are presented using numerical simulation of a discrete map of the two-cell DC/DC buck converter obtained by expressing successive crossings of Poincaré section in terms of each other.