When you use full disk encryption only the crypt header reveals your using it.
Using:
cryptsetup luksDump/dev/device
You can get the length of the header to make a backup:
dd if=/dev/device of=./backupfile count=length
Then you can overwrite it with:
dd if=/dev/urandom of=/dev/device
Now your disk cannot be recognized as encrypted, storing the cryptheader on a micro-SD card allows you to quickly eat it when necessary.
You can also carry a very strong magnet Neodymium magnet, this allows you to wipe your harddrive in a second.
Slashdot Mirror
When you use full disk encryption only the crypt header reveals your using it. Using: cryptsetup luksDump /dev/device
You can get the length of the header to make a backup:
dd if=/dev/device of=./backupfile count=length
Then you can overwrite it with:
dd if=/dev/urandom of=/dev/device
Now your disk cannot be recognized as encrypted, storing the cryptheader on a micro-SD card allows you to quickly eat it when necessary.
You can also carry a very strong magnet Neodymium magnet, this allows you to wipe your harddrive in a second.