Wireless sensor networks (WSNs) are communication infrastructures containing a large number of spatially distributed nodes equipped with micro-sensors. These small devices are used to sense data from a specific region and to collaborate in order to collect and process them. Data are then transmitted to a base station. Although WSNs have existed for several decades, they are one of the key components of Internet of Things (IoT)-based products and services [1]. Indeed, they play a significant role in various future IoT application scenarios such as health care [2], environmental monitoring [3] and smart cities [4]. Comparing sensor networks to ad-hoc networks, the number of sensor nodes in a sensor network can be several orders of magnitude higher than the nodes in an ad-hoc network. Sensor nodes are densely deployed and they are limited in power, computational capacities
Vehicular Ad hoc NETworks (VANETs) are a key part of the Intelligent Transport Systems (ITS) as they constitute an intelligent transport network where vehicles and some infrastructure collaborate to exchange messages about traffic, accidents, etc. In such context, security becomes a key component to ensure that exchanged messages were not modified or inserted for example. Consequently, a wide variety of research contributions have been recently presented to cope with this issue. This paper presents a review of most recent papers dealing with security issues in VANETs. Hence, it presents an overview of VANETs and mainly their characteristics as well as their main applications. Then, the main security challenges faced by VANETs are introduced. This is done by first listing their main security requirements, second by establishing attackers' profiles, and their attacks and third by introducing some security solutions. Finally, the opportunities and challenges related to VANETs security are presented such as Trust, Internet of Vehicle, etc.
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