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Re:BusKill – A USB kill cord for laptops by heavenlyblue on Wednesday December 15, 2021 @09:34AM (#29566441)
Why not have a bluetooth/wifi/customised proximity device constantly connected to your laptop (and resides in your wallet/shoes/private parts) and if you suddenly are too far away from your laptop while it's unlocked it gets purged?
Re:BusKill – A USB kill cord for laptops by maltfield on Wednesday December 15, 2021 @12:38PM (#29569082)
If all you want is a bluetooth/wifi solution, then there's tons of "solutions" on the market for this. See our "comparison" table on CrowdSupply for some options:

* https://www.crowdsupply.com/alt-shift/buskill

When I designed BusKill, I intentionally avoided wireless solutions.

BusKill is designed for situations where the risk is extremely high, and you'll find that the radio-based solutions aren't very secure. They're faulty and have huge surface areas of attack.