Multimedia sensors are attracting the attention of the researchers increasingly, and have shifted the focus from traditional scalar sensors to sensors equipped with multimedia devices. The characteristics of multimedia services impose more resource constraints that involve energy consumption, memory, buffer size, bandwidth, and processing capabilities. Existing routing solutions used in wireless multimedia sensor networks suffer from limitations in term of QoS and energy efficiency. In this paper, we propose a new QoS routing solution to increase the energy efficiency while guaranteeing the QoS requirements of the multimedia services over the wireless sensor networks.
Security presents a big challenge for transmitting voice traffic over the Internet. The goal is to acquire the same security level offered by the standard telephony without affecting the performance and the quality of service. VoIP security solutions must take into account the real-time constraint of voice service and their mechanisms should address possible attacks and overhead associated with it. Virtual Private Networks (VPNs) are considered actually the strongest security solutions for communications between users and intranet over an IP network. Most VPN solutions are proposed for tunneling data traffic while our proposed VPN solution is to support real time traffic. This paper compares the different VPN technologies and their associated security protocols presenting the advantage and drawbacks of each solution. Moreover, it presents VoIP security protocols and voice traffic protected by IP Security mechanisms. The paper ends by presenting our proposed VPN solution to secure voice over IP packets that guarantees the performance and quality of services, without reducing the effective bandwidth.
Security and privacy become mandatory requirements for VoIP communications that needs security services such as confidentiality, integrity, authentication, non-replay and nonrepudiation. The available solutions are generic and do not respect voice specificities and constraints. Thus, QoS of the voice is affected by delay, jitter, and packet loss. New security solutions must take into account the real-time constraint of voice service and their mechanisms should address possible attacks and overhead associated with it. Nowadays, VPNs (Virtual Private Networks) is considered the strongest security solutions for communications over IP networks. Most VPN solutions are implemented to tunnel data traffic while the trend toward a converged data and voice network, however, places new demands on VPNs to support real time traffic.In this paper we compare the VPN security protocols presenting their advantage and drawbacks. Then we present our new solution to secure voice over IPSec VPNs while guaranteeing the performance and quality of services, without reducing the effective bandwidth. We use the AVISPA model to analyze the security vulnerabilities of exchange messages to initiate session and establish VPN.
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