A novel acknowledgment-based approach against collude attacks in MANET

Routing misbehavior and collusion attack in Mobile Ad Hoc Networks (MANETs) are the main topics in this paper. Various techniques prevent routing misbehaviors have been published, but most of them do not consider the collusion attacks. Therefore, we propose the scheme called NACK to simultaneously detect routing misbehavior and collusion attacks, and to mitigate the effects of routing attacks. Furthermore, NACK scheme adopts an acknowledgment-based approach and timestamps comparison to resist the attacks mentioned above. The security analysis and simulation results are presented to evaluate the performance of NACK.

► We propose an acknowledgment-based technique to detect and mitigate the dropping attacks.
► Our scheme can solve the drawbacks of watch-dog mechanism and 2ACK mechanism.
► We can prevent collusion attacks effectively, when two consecutive nodes collude.
► Compared with other approaches such as the overhearing techniques, our scheme has better performance.