a broadcast authentication protocol enables the receivers to verify that a received packet was really sent by the claimed sender. Data confidentiality, authenticity, integrity, and non repudiation are basic concerns of securing data delivery over an insecure network. Large and distributed systems with time critical applications require immediate and secure authentication of command and control ...

In different this paper we present the performance evaluation study of a simple broadcast data dissemination technique in new emerging Vehicular Ad hoc Networks (VANETs). Differently from the traditional Mobile Ad hoc NETworks (MANETs), VANETs require particular routing protocols, due to the high dynamism of the network topology, and to different traffic and mobility patterns. For safety and em...

We present two protocols, a distributed reliable broadcast and a distributed reliable multicast; these protocols are resistant to network partitions in asynchronous distributed systems. They are reliable in the sense that the receiver will eventually receive the message even if the receiver was partitioned away at any time. The protocols are aimed either for large scale or smaller networks. We ...

In this paper we discuss the mechanism of multipoint relays (MPRs) to efficiently do the flooding of broadcast messages in the mobile wireless networks. Multipoint relaying is a technique to reduce the number of redundant re-transmissions while diffusing a broadcast message in the network. We discuss the principle and the functioning of MPRs, and propose a heuristic to select these MPRs in a mo...

This paper will discuss physical layer aspects of the novel approach taken within the SATIN framework to deliver Multicast/Broadcast multimedia services (MBMS) through a satellite network with minimum change to the terrestrial 3G WCDMA air interface. Keywords—SATIN, S-UMTS, Physical layer, UTRA, W-CDMA

Astheenergyefficiencyremainsakeyissueinwirelesssensornetworks,duty-cycledmechanisms acquiredmuchinterestduetotheirabilitytoreduceenergyconsumptionbyallowingsensornodesto switchtothesleepingstatewheneverpossible.Thechallengingtaskistoauthorizeasensornodeto adoptaduty-cyclemodewithoutinflictinganynegativeimpactontheperformanceofthenetwo...