A method preventing relay attacks between first and second devices is disclosed. The method includes providing, by a first device, a command message, receiving a request message and providing a response message to a second device. The time period between the receipt of the command message and the transmission of the response message by the first device is compared to another time period between the time when the command message was sent and the response message was received by the second device. If those times substantially match, then the first device can have assurance that a relay attack is not occurring.