Date Added: Jul 2011
In this paper, the authors propose a new method to detect relay attacks. The relay attacks are possible in many communication systems, and are easy to put in practice since the attackers don't require any knowledge about the underlying protocols or the cryptographic keys. So far the most practical solutions against relay attacks rely on distance-bounding protocols. These protocols can provide an estimated maximum distance between two communicating devices. They provide a different solution that can detect a relay attack regardless of the distance between the devices. Their solution relies on introducing intentional errors in the communication, providing a kind of hop-count metric.