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Modern multimedia communication tools must have high security, high availability and high quality of service (QoS). Any security implementation will directly impact on QoS. This paper will investigate how end-to-end security impacts on QoS in Voice over Internet Protocol (VoIP). The QoS is measured in terms of lost packet ratio, latency and jitter using(More)
Sensor networks have many applications in monitoring and controlling of environmental properties such as sound, acceleration, vibration and temperature. Due to limited resources in computation capability, memory and energy, they are vulnerable to many kinds of attacks. The ZigBee specification [1], based on the 802.15.4 standard [2], defines a set of layers(More)
JXTA is a set of open protocols that enable the creation and deployment of peer-to-peer (P2P) networks, allowing the execution of services in a distributed manner. Being a generic P2P middleware, it has slowly evolved in order to appeal a broad set of different applications. Part of this evolution includes providing basic security capabilities in its(More)
SUMMARY With the evolution of the P2P research field, new problems, such as those related with information security, have arisen. It is important to provide security mechanisms to P2P systems, since it has already become one of the key issues when evaluating them. However, even though many P2P systems have been adapted to provide a security baseline to(More)
JXME is the JXTA protocols implementation for mobile devices using J2ME. Two different flavors of JXME have been implemented, each one specific for a particular set of devices, according to their capabilities. The main value of JXME is its simplicity to create peer-to-peer (P2P) applications in limited devices. In addition to assessing JXME functionalities,(More)
This paper presents an innovative academic experience regarding the use of PlanetLab—an open large-scale platform over the Internet—in engineering courses on distributed systems. By integrating a live-deployment environment such as PlanetLab into distributed-systems courses, software implementations developed by students can interact with instructors'(More)
Modern multimedia communication tools must have high security, high availability and high quality of service (QoS). Any security implementation will directly impact on QoS. This paper will investigate how end-to-end security impacts on QoS in Voice over Internet Protocol (VoIP). The QoS is measured in terms of lost packet ratio, latency and jitter using(More)
JXTA is a peer-to-peer (P2P) middleware which has undergone successive iterations through its 10 years of history, slowly incorporating a security baseline that may cater to different applications and services. However, in order to appeal to a broader set of secure scenarios, it would be interesting to take into consideration more advanced capabilities,(More)