Abstract -In mobile ad hoc networks, data transmission is tunneling, this attack imposes severe threats to ad hoc performed within an untrusted wireless environment. Various network routing protocols. For example, in AODV, the path kinds of attack have been identified and corresponding solutions with smallest hop count is selected. Since the malicious nodes have been proposed. Wormhole attack is one of the serious are acting as neighbors, the AODV routing protocol would attacks which forms a serious threat in the networks, especially get wrong hop count information and select an inappropriate against many ad hoc wireless routing protocols and location-. . based wireless security system. We identify two types of ath. Malicious nodes can also lure other nodes to send traffic wormhole attacks. In the first type, malicious nodes do not take through them by advertising apparently short paths so as to part in finding routes, meaning that, legitimate nodes do not launch other attacks to the data packets. malicious. Some researchers have proposed detection information in apacket to restrictuthe transmission distance of mechanisms for the first type. In this paper, we propose an the packet so as to avoid tunneling. The authors called the efficient detection method called Delay Per Hop Indication information packet leash and they proposed two types of (DelPHI). By observing the delays of different paths to the packet leashes: geographical leash and temporal leash. In the receiver, the sender is able to detect both kinds of wormhole geographical leashes, the location information and loosely attacks. This method requires neither synchronized clocks nor synchronized clocks together verify the neighbor relation. In special hardware equipped mobile nodes. The performance of the temporal leashes, the packet transmission distance is DelPHI is justified by simulations. calculated as the product of signal propagation time and the
This single threshold method is also used in the Delay Per Hop Indication (DelPHI) scheme in REF .
DelPHI: wormhole detection mechanism for ad hoc wireless networks
2006 1st International Symposium on Wireless Pervasive Computing
2006 1st International Symposium on Wireless Pervasive Computing
Computer Science