cryptsetup-nuke-password - 6+b1 main

Installing this package lets you configure a special "nuke password" that
can be used to destroy the encryption keys required to unlock the encrypted
partitions. This password can be entered in the usual early-boot prompt
asking the passphrase to unlock the encrypted partition(s).
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This provides a relatively stealth way to make your data unreadable in
case you fear that your computer is going to be seized.
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After installation, use “dpkg-reconfigure cryptsetup-nuke-password” to
configure your nuke password.