self_terminat_method

1st Gen - dd

just a simple dd start with zero
do nothing on ram

2nd Gen - initrd

reboot, format, and dd

3rd Gen - kernel module

know memory schema, and erase heap, cache, process area
know disk schema, erase structure firse, then random erase data area

or - in register killer

a small binary can run inside processor
random erase RAM
random erase Drives