Ad Hoc network consists of a set of mobile wireless nodes that can communicate with each other without fixed networking infrastructure. Because of the dynamic changes of network topology, limited bandwidth and energy, and distributed architecture, Ad Hoc network is more susceptible to various kinds of attacks.Wormhole is a kind of serious attack against Ad Hoc network. In a wormhole attack, an attacker receives packets at one point in the network, "tunnels" them to another point in the network, and then replays them from that point. For tunneled distances longer than the normal wireless transmission range of a single hop, it is simple for the attacker to make the tunneled packet arrive with better metric than a normal multi-hop route, and then the attacker can drop or modify the packets, or even damage the network topology.Ad hoc on demand distance vector (AODV) protocol and the optimized link state routing (OLSR) are two typical routing protocols in ad hoc networks.
