Wireless ad-hoc network is a set of independent mobile nodes that communicates through a wireless link. Due to open medium and lack of centralized authority, ad-hoc networks are susceptible to numerous routing attacks. Wormhole attack is one of the most severe attacks on routing protocols in which two or more malicious nodes receive packets at one point of the network and transmit them to another location by a wired or wireless tunnel. This attack is so powerful that the detection of it is difficult. This attack can form a serious threat in wireless networks, especially against many wireless ad-hoc networks and location-based wireless security systems.