4 ms·
Is there any type of encryption between the car and the key? Or are the signals always constant? Could you just record the relay signal and play it back whenev
by cjjuice 8y ago
Is there any type of encryption between the car and the key? Or are the signals always constant?
Could you just record the relay signal and play it back whenever, essentially replicating the key?
- W-_-D 8y agoI believe a nonce is used to prevent replay attacks, but wouldn't be surprised if there are some fobs out there which are vulnerable to replay.
- Reason077 8y agoIt uses a challenge-response protocol, so you can’t simply record the signal and play it back.
- deleted 8y ago[deleted]
- thebluehawk 8y agoEvery run of the mill garage door opener using rotating keys or nonces to prevent replay attacks. I assume any fob design worth its salt would implement something similar.
- ehsankia 8y agohttps://www.youtube.com/watch?v=CNodxp9Jy4A https://www.youtube.com/watch?v=CNodxp9Jy4A
- lordnacho 8y agoIt might not matter. If the point of the amp is to reduce the effective distance between the car and the fob, whatever messages are exchanged will look right to the car and the door will open.