chkboot - 1.3-8.2 main

chkboot is a set of scripts that will display a notification (console or
graphical) when boot files are tempered with.
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This tool is indented to be used on encrypted disks. In order to get the
operating system to run, parts of the boot process must remains un-encrypted.
chkboot checks that those files have not changed between reboots.
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Since the scripts and the data they generate are stored on the encrypted part
of the disk, any attempts to modify the boot partition between reboots will be
detected.
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Please note that this tool is not effective against rootkit that hides every
boot files modifications or prevents chkboot from functioning properly.