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As the city road networks is growing day-by-day, the question of how to obtain information about the roads is becoming more and more challenging. In such an era Intelligent Transportation Systems (ITSs) has emerged as a key candidate that is benefited from the unique features and capabilities of Wireless Sensor Networks (WSNs) and Bluetooth technology. WSNs are composed of small tiny devices that work in autonomous manner to sense the surroundings. The Bluetooth protocol can be used for intervehicle communication among vehicles equipped with Bluetooth devices. ITSs are a state of art combination of transportation infrastructure and computer and information technology. ITSs can also resolve severe situations like traffic congestion and cope with emergency conditions like major accidents. This paper presents an efficient architecture that will increase the safety of road travel using the concepts of WSN and the Bluetooth protocol. We also discuss the ad-hoc network formation between vehicles and data exchange sensed by sensors. The simulation results show that Bluetooth and sensor networks can be used collaboratively to increase the safety of road travel. General TermsAlgorithms

Mobile ad-hoc networks (MANETs) are a form of wireless networks which do not require a base station for providing network connectivity. Mobile ad-hoc networks have many characteristics which distinguish them from other wireless networks which make routing in such networks a challenging task. Cluster based routing is one of the routing schemes for MANETs in which various clusters of mobile nodes are formed with each cluster having its own clusterhead which is responsible for routing among clusters. In this paper we have proposed and implemented a distributed weighted clustering algorithm for MANETs. This approach is based on combined weight metric that takes into account several system parameters like the node degree, transmission range, energy and mobility of the nodes. We have evaluated the performance of proposed scheme through simulation in various network situations. Simulation results show that proposed scheme outperforms the original distributed weighted clustering algorithm (DWCA).

In today"s era of the ubiquitous computing, the Internet has become the main mode of data communication. Most of the devices used in wireless/mobile environments, that form wireless networks, ad-hoc networks and wireless sensor networks etc., have low computational power, memory and limited battery power. In such a Pervasive Computing environment, providing security to data becomes a complex task. Elliptic Curve Cryptography (ECC) has become the preferred choice for the pervasive computing environment because of its suitability to the devices having limited bandwidth, battery power, less computational resources and less memory. This paper provides an introduction to ECC and presents a survey on the current use of ECC in the pervasive computing environment. General TermsSecurity in pervasive environment.