US Patent 10043329 Detection and protection against jam intercept and replay attacks

Method and apparatus are disclosed for detection and protection against jam intercept and replay attacks. An example disclosed key fob includes a first wireless transceiver tuned to communicate via a first frequency band, second wireless transceiver tuned to communicate via a second frequency band, and a communicator. The first frequency band is different than the second frequency band. The example communicator sends a first message via the first wireless transceiver in response to activation of a first button. Additionally, the example communicator, in response to not receiving a second message via the second wireless transceiver, provides an alert.