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Format drive if wrong decryption key is prompted?
(sopuli.xyz)
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The prompt running on (many) distributions boot has a time limit, but if you pull the drive and plug it into another host (or boot from USB) the limitation doesn't exist.
You could bake that into init scripts since the kernel is already running. On the same spot where the time delay triggers you could just wipe the drive instead of prompting to wait until receiving new password. But that still leaves the option to pull the drive physically into another host and do whatever you like with it since the wiping code on the drive wouldn't/couldn't execute.