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IEEE 802.11e is a wireless local area networking standard introducing quality of service. It defines new MAC protocols, mainly HCF and EDCF. EDCF is a contention-based channel access scheme and is part of HCF for infrastructure networks and may be used as a separate coordination function for wireless ad-hoc networks. The aim of this paper is to propose a(More)
Covert channels exist in most communications systems and allow individuals to communicate truly undetectable and exchange hidden information. That's why their detection seems to be a big deal for security systems. However, till now, security systems do not include dedicated processes for covert channel detection. In this paper, we first propose mechanisms(More)
After a presentation of the context of the formation from a far, we present a platform for teaching of technology based on three components: a remote handling platform for automatic devices and regulation, a numeric supports in electronics and computer science and a virtual university platform in Tunisia. An approach of specification based on the systemic(More)
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