Package description:
scrub overwrites hard disks, files, and other devices with
repeating patterns intended to make recovering data from
these devices more difficult. Although physical destruction
is unarguably the most reliable method of destroying sensitive
data, it is inconvenient and costly. For certain classes of
data, organizations may be willing to do the next best thing
which is scribble on all the bytes until retrieval would
require heroic efforts in a lab.
