This fourth International Conference on Communications and Networking ComNet’2014 will take place in Tunisia from 19 to 22 March 2013. " Dear authors, thank you very much for your contribution to ComNet'2014 Conference. The conference continues to receive very positive feedback on the high quality of the research work presented as well as on the excellent organization of the event’s program. In the aim to offer you the best service, the website of ComNet’2014 has been migrated to a new server. This operation caused some confusion in the update of information. But everything is backs to normal, and the submission deadline has been extended to 30 October 2013. We look forward to seeing you on ComNet’2014. " ComNet’2014 aims at bringing together ICT researchers from northern and southern countries to meet, exchange ideas and expertise, initiate and strengthen cooperation between them on topics related to communications and networking. It positions itself as a platform to researchers and practitioners both from academia and industry to meet and share cutting-edge research and development in these fields. ComNet’2014 will provide an excellent international forum for sharing knowledge and research results in theories, methodologies and applications in different topics related to communications and networking, both in wired and wireless networks, from a theoretical as well as practical point of view. Original papers are invited on topics related to computer networks, network protocols, wireless networks, data communication technologies and network security. Authors are solicited to contribute to this conference by submitting articles that illustrate research results, projects, surveying works and industrial experiences that describe significant advances in the related areas.