摘要：Due to the infrastructure-less, dynamic, and broadcast nature of radio transmissions, communications in mobile ad-hoc networks, MANETs, are susceptible to malicious traffic analysis. After performing traffic analysis, an attacker conducts an intensive attack (i.e., a target-oriented attack) against a target node specified by the traffic analysis. Because of the degradation of both throughput and security of routing, traffic analysis and its subsequent target-oriented attack are known as serious problems in regards to MANETs. Basically, position information of routing nodes is very sensitive data in MANETs, where even nodes not knowing each other establish a network temporarily. It is desirable that position information is kept secret. All of these problems are especially prominent in position-based routing protocols of MANETs. Therefore a new position-based routing protocol, which keeps routing nodes anonymous, thereby preventing possible traffic analysis, is proposed. The proposed scheme uses a time-variant temporary identifier, Temp ID, which is computed from the time and position of a node and used for keeping the node anonymous. Only the position of a destination node is required for the route discovery, and the Temp ID is used for establishing a route for sending data. A receiver dynamic-handshake scheme is designed for determining the next hop on-demand by using the Temp ID. The level of anonymity and the performance of this scheme were evaluated. The evaluation results show that the proposed scheme ensures the anonymity of both route and nodes and robustness against a target-oriented attack and other attacks. Moreover, this scheme does not depend on node density as long as nodes are connected in the network.
