In this book, we address a key topic in the field of computer networking security which is detection of black hole nodes in MANET. This problem is a form of denial of service attack that makes a gap for data traffic in MANET. We focus in our research on the ad hoc network that is more vulnerable this attack due to its infrastructureless nature. VANET is a type of ad hoc networks where each node is a car and the main aim is to exchange data to for managing the cars' movement. Our proposal deals with the detection of black hole attacks that may occur in a VANET.