theoretical analysis

After intensive experiment and theoretical analysis, NLSBT show better performance with other schemes, such as low storage, computation and communication, and also show good robustness in the environment of underwater.As the same with other support techniques in WSNs, locating also exists of security problem, also faces the inner and outside attack, and more seriously exists of the attack to hardware. In this paper, the attacks in techniques of locating is analysed, and the existing secure techniques of locating is surveyed. Based on these work, the part security problem of DV-Hop algorithm in APS (AD Hoc Position System) is studied. The algorithmn of DV-Hop depend on the exchange of data packets to estimate the distance to the node that has a known position, which is very cheap and convenience to the network with limited resource. But its security is not taken into account in the original design. Wormhole attack is simple and easy to implement in known types of attacks, which makes two far nodes directly communicate and in which the attacker does not need modify the packets. Lunching wormhole attack in DV-hop can cause the algorithm invalid. In this paper, wormhole attack in DV-hop is discussed, and a new scheme, which is named DWDV, that is proposed to defend wormhole attack. DWDV is simulated on positif2.0 based on OMNET++ and the experimental results show that DWDV can effectively defend wormhole attack and make more nodes get a valid position.
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