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usbkill
« usbkill » is an anti-forensic kill-switch that waits for a change on your USB ports and then immediately shuts down your computer.
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Of course, this is a kill switch, but that's usually detectable if the attacker is sophisticated enough. Plus, they can always backup the disk before.
Plausible deniability lets you pretend you do not have incriminating data, but it's tricky to use in the first place: https://gitlab.com/cryptsetup/cryptsetup/-/wikis/FrequentlyA...
Travelling with an empty disk seems like a more appropriate option. Dm-verity could probably be used to check that there has been no tampering.
https://github.com/hephaest0s/usbkill
This does the same thing, but you can use any USB hardware as the entry/remove trigger. And you can script it to whatever you want.
But... that doesn't sell unneeded hardware.