Abstract Radio Frequency Identification (RFID) systems are used to automatically identify objects by using radio waves transmitted between readers and tagged objects. While the RFID technology has numerous potential applications in healthcare, military, commerce, to list a few, it raises many security and privacy risks and concerns due to the wireless transmission for data between the tag and the reader. Additionally,... Radio Frequency Identification (RFID) systems are used to automatically identify objects by using radio waves transmitted between readers and tagged objects. While the RFID technology has numerous potential applications in healthcare, military, commerce, to list a few, it raises many security and privacy risks and concerns due to the wireless transmission for data between the tag and the reader. Additionally, the limited computational power of the tag is usually insufficient to apply robust security measure.. In this paper, we will discuss the main RFID privacy and security threats and their countermeasures. Our emphasis will be on RFID usages in smart spaces such as smart hospitals and how to maintain the privacy of subjects in the systems including doctors, nurses and patients. Read More Read Less

Abstract VoIP-based applications are emerging as new technologies in the e-learning area by proposing new and flexible modes of communications between students and teachers. In this paper, we propose a SIP-based clustered architecture based on failover and load balancing mechanisms that are used to ensure the high availability and scalability of such systems. We define also a distributed test architecture in... VoIP-based applications are emerging as new technologies in the e-learning area by proposing new and flexible modes of communications between students and teachers. In this paper, we propose a SIP-based clustered architecture based on failover and load balancing mechanisms that are used to ensure the high availability and scalability of such systems. We define also a distributed test architecture in order to verify the performance of the implemented system. Experimental results show the importance of failover and load balancing techniques to build highly available systems and the use of load testing as a validation technique to detect servers failure and call losses. Read More Read Less

Abstract In order to define new switched Ethernet functions for data center use, the project IEEE802.1Qau [1] for congestion management is underway in the IEEE 802.1 standards committee. The aim of this project is to develop Ethernet congestion control algorithm for hardware implementation. Our focus is on Quantized Congestion Notification (QCN) algorithm, which is being considered by the IEEE802.1Qau standards for... In order to define new switched Ethernet functions for data center use, the project IEEE802.1Qau [1] for congestion management is underway in the IEEE 802.1 standards committee. The aim of this project is to develop Ethernet congestion control algorithm for hardware implementation. Our focus is on Quantized Congestion Notification (QCN) algorithm, which is being considered by the IEEE802.1Qau standards for deployment in switched Ethernet networks. In this paper, based on simulation results, we show how QCN can dynamically control traffic flow, and we study QCN performances properties related to congestion control. In addition, we compare QCN behavior and performances to another backward congestion notification algorithm, which is Ethernet Congestion Management (ECM). The comparison between these two mechanisms is based on simulation results. Read More Read Less

Abstract The IEEE 802.16 standard, usually known as WIMAX, is the latest technology that has promised to offer broadband wireless access over long distance. In this article we offer an overview of the state-of-the-art of security issue on WIMAX, which is a new and hot research point for telecommunication and computer scientist, we analyze vulnerabilities contained in layers and we categorize... The IEEE 802.16 standard, usually known as WIMAX, is the latest technology that has promised to offer broadband wireless access over long distance. In this article we offer an overview of the state-of-the-art of security issue on WIMAX, which is a new and hot research point for telecommunication and computer scientist, we analyze vulnerabilities contained in layers and we categorize these weakness into three kinds: man-in-the-middle, replay and denial of service attacks. We give a classification of the man-in-the-middle attacks based on unauthentication, unencryption message and unmutual authentication. Some of these attacks have been fixed with the adoption of recent amendments and security solutions in IEEE 802.16 but some still persist exist and need to be resolved. In our paper we propose a new authentication protocol more reliable and secure to prevent replay, DOS and man-in-the-middle attacks. Read More Read Less