Question re use of dd to overwrite asset in README

[Phil H <philtickle200@xxxxxxxxx>]

Just me with another question ...

Is there any particular reason(s) the examples in the
loop-aes README use "dd" to overwrite the device with
encrypted zeros (in order to mask how much cyphertext
is subsequently written there), instead of (say) using
shred eg..

	>~ ln -s /dev/fd0 tmp.$$
	>~ shred -n 1 -v tmp.$$
rm -f tmp.$$

- as can be seen in some of the older online guides to
loop-aes.

Why do I care? Because dd doesn't appear to have
usable exit values (it's 1 no matter what happens?),
so you can't really test in a script if it's  finished
properly.

On the other hand, shred has a non-zero exit value if
something went wrong.


		
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Linux-crypto:  cryptography in and on the Linux system
Archive:       http://mail.nl.linux.org/linux-crypto/