Mobile Ad-hoc Networks are wireless networks, where the devices can move around and leave or join the network freely. These networks are gaining popularity because of their ease of use and cost effectiveness. Even so, MANETs have yet to properly solve several issues that stem from their unique characteristics, such as the lack of central control and monitoring or the dynamically changing topology.
The routing protocols, protocols that are responsible for forwarding the traffic from one device to the other, are a vital part of the network, their proper operation is of key importance. If not secured, malicious attackers can easily disrupt the performance of the MANET.
The scope of this thesis is to overview the security issues regarding these routing protocols and to demonstrate that without protection, the routing function of the network can be rendered useless. First a small testing network was assembled and then black hole type attack was executed in it. The black hole attack’s purpose is to convince the network elements to send their packets through a specific, often malicious device, which then can simply drop these packets instead of forwarding them.