[ale] A little math

[Greg Freemyer]

> I'm just going by people recommendations in setting up a LUKS volume.
> They all agree to do the urandom data will produce a stronger means of
> encryption as opposed to all zeros, which is the last data pattern
> written in the badblocks utility.

Ah, that's different.  I assume they want random data so an attacker
can't differentiate encrypted data from empty space by a entropy test.

You are at the mercy of /dev/urandom and your cpu power.

Greg