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Could one make a lock that unlocks wirelessly via radio communication? I would imagine something that gets its energy from the outside, similar to wireless cha
by MrThoughtful 4y ago
Could one make a lock that unlocks wirelessly via radio communication?
I would imagine something that gets its energy from the outside, similar to wireless charging. So the key would provide the energy.
It could be Bluetooth or some proprietary technology.
So you hold the key next to the lock and the two devices exchange some challenge response data that proves the key holds the secret key that is allowed to open the lock.
I guess that would be unpickable. Just like a locked Android/iOS phone is unpickable.
Would anything prevent this design?
- perlgeek 4y agoThings like this have been made, but there are challenges: * you have to prevent replay attacks, where somebody just records a session and replays the response * lower-power devices are usually vulnerable to side-channel attacks, for example you can limit the power supply just to threshold where it starts working, and then you can infer information about the internal state and possibly key material If you look at practical attacks against existing key fobs, you'll see that there are a lot of things that can go wrong in the field.
- mgdlbp 4y agoAre there wired electronic keys? No wireless vulnerabilities, and no picking, either. There'd be something like opto-isolated data and a separate circuit powering the key to protect the lock electronics. Edit: This concept is called a 'passive electronic lock'