YourOSoft is a web company specialized in the development of IT/web solutions for companies, based on open source. We provide solution based on PHP and Java/Spring and relies on best practices as well as industry standards (MVC, REST API, hybrid)

The WebSabaki company aims to provide innovative solutions that meet the specific needs of its customers, whether companies or individuals. We focus our activities in the field of web, given the flexibility provided by this support.To ensure optimum quality, the WebSabaki company responds quickly and accurately to your needs, and propose solutions adapted to them. To ensure quality work, we also strive to implement secure solutions and optimized.

Projects manager and developer:- Web 2.0 websites such as http://www.clickflysmile.com- Web Plateforms French companies- SyncEvents2Cal developer

Thesis Abstract: The protection of sensitive data, in order to assure their confidentiality, integrity and availability, is an essential objective for sensitive organizations as governments. Technical solutions must guarantee that the security objectives are satisfied, as for instance multilevel security rules associated to top secret data. In this thesis, I introduce new concepts in order to manage the exchanges of such classified data in dynamic information systems. In the first part of my work, I studied the concept of declassification and propose a taxonomy of such actions in an information systems. In a second part, I study the security needs associated to the concept of declassification. I revisit the concept of dynamic information systems and formalize the concepts of confidentiality, integrity and consistency for such environments. I also define the associated security policies which, once merged, let one securely enforce the concept of declassification. I then consider such an enforcement of declassification actions in dynamic information systems as the Oracle database management system. This thesis open new perspectives for the modeling of the concept of declassification and the definition of declassification policies, as for the enforcement of such policies in centralized and decentralized information systems.See the website: http://thesis.julienthomas.eu/

Internship AbstractFor several years, Ad hoc networks is a major field of research. In such networks, extreme cases occur, such as advanced attacks due to the wireless aspect of the communications between nodes and the fact that the network is self-organized. Moreover, mobility in such networks is an important inconvenient as it leads to unstable networks.Many studies deals with routing techniques in such environments. The main works done in this case are the design of efficient routing protocols to solve problems such as non-bidirectional links or highly-mobile nodes and to manage security aspects.With the emergence of security needs in wireless networks and more specifically in ad hoc networks (for military's applications or consumers ones, for instance with multi-players games or tele conferences), several secured protocols at the application layer have been proposed, mainly to build secure groups. In order to provide group communication privacy, we need to have a common secret key. However, efficiently managing group keys in mobile networks, such as ad hoc networks, is difficult as every time the group changes (a node joins or leaves the group), the group key needs to be modified. Moreover, due to the wireless and the self-organized aspects of such networks, the notion of centralized trusted third party has to be reconsidered. In such cases, designing a secured group management protocol is not so easy. Thus, we undertake the design of a secure group management protocol. See the associated website (French): http://master.julienthomas.eu