Vehicular Ad-hoc Networks (VANETs) is a technology that has been recently emerged, and brings a lot of research interests. Security is one of the important issues in VANET, it is considered a critical point in the development of robust VANET applications. In this paper, various dimensions of VANETs including its emerging applications, security issues, challenges, security threats and the existi...

Local vehicle density state estimation is increasingly becoming an important factor of many Vehicular Ad-hoc Networks (VANETs) applications such as traffic state estimation and protocols such as congestion control. This estimation is used to get an estimated number of the neighbors within the transmission range. The periodic sent messages (beacons) are not sufficient to cover transmission range...

This paper provides an overview of reliability issues in vehicular ad hoc networks (VANETs) for safety-related applications. First, IEEE 802.11p based DSRC system, communication environment, and applications on safety related services are introduced. The factors affecting the reliability of safety services provided by VANETs are identified. Second, the features and requirements of VANETs for sa...

Vehicular Ad hoc Networks (VANETs) are the hopeful approach to offer safety and other applications to the drivers and customers. A lot of works have been completed towards it but security in VANET is still challenging. Data dissemination is the basic process in vehicular ad hoc networks (VANETs). Data dissemination is used to improve the quality of driving in terms of time, distance and safety....

In traffic safety applications of Vehicular Ad-hoc Networks (VANETs), security is a very important issue. Sybil attack is a particular attack where the attacker illegitimately claims multiple identities. In the past, several approaches have been proposed to solve this problem. They are categorized into PKI-based, infrastructure-based, observer-based, and resourcetesting-based schemes. In this p...

To improve the condition of road traffic, Vehicular Ad Hoc Networks (VANETs) plays a vital role and this emergent technology integrates the areas like ad hoc network, WLAN and cellular technology which leads to intelligent inter-vehicle communications and hence a safe drive. Due to the mobility and network architecture of VANETs, the flow of traffic information from source to destination poses ...

A recent surge of research on Vehicular Ad-hoc Networks (VANETs) has given us new opportunities and challenges. Besides safety-related applications, commercial applications also find their way to fully utilize these networks. One of the promising applications is the dissemination of commercial advertisements over VANETs. However there are uncooperative vehicles that may disrupt the spreading of...

Vehicular Ad-hoc Networks (VANETs) are known as a special type of Mobile Ad-hoc Networks (MANETs) specialized in vehicular communications. These networks are based on smart vehicles and basestations, which share data by means of wireless communications. To route these information, a routing protocol is required. Since the VANETs have a particular network features as rapidly changeable topology,...