In our last post we examined the possibility to recover deleted data from USB keys and disks. Today we want to focus your attention on the proper way to destroy sensitive data from your disks.
On Ubuntu you have the possibility to move any file to the Trash but, as we demonstrate in our last post, anyone has the possibility to recover them using a simple, basic GUI, program called PhotoRec.
If you want to be reasonably sure that none will be able to recover a file you decided to permanently delete you have to use the Shred command. Shred is native in Ubuntu Kernel and literally delete your files overwriting them repeatedly with arbitrary data. After you delete a file with Shred you can be sufficiently sure that recovering procedures will not succeed.
As usual we must warn you that technology is rapidly evolving and what could be considered sure today, tomorrow will be out of date! So, if you think you need to preserve your privacy in the best way, don’t forget to change the hard disks regularly and mechanically destroy your old ones. Sincerely we hope our readers haven’t this kind of need.
To start using Shred on Ubuntu you have to open a Terminal and type:
sudo shred –help
In this way you will visualize the grammar and all the possible options offered by this program.
The correct grammar to use Shred is:
shred [OPTIONS] FILE
or, if you want to shred a entire partition:
shred [OPTIONS] /dev/[HDA9]
The possible options are:
-f, –force change permissions to allow writing if necessary
-n, –iterations=N overwrite N times instead of the default (3)
–random-source=FILE get random bytes from FILE
-s, –size=N shred this many bytes (suffixes like K, M, G accepted)
-u, –remove truncate and remove file after overwriting
-v, –verbose show progress
-x, –exact do not round file sizes up to the next full block;
this is the default for non-regular files
-z, –zero add a final overwrite with zeros to hide shredding
–help display this help and exit
–version output version information and exit
In our experience, to operate in the fastest way, we decided to add Shred on the Nautilus Menu and have the command ready with a simple right click on the mouse.
For this reason you have to open a Terminal and type:
sudo apt-get install nautilus-actions
Then you launch the program following this path: System->Preference->Nautilus Actions Configuration.
Last, you have to configure Shred filling e.g. the following parameters:
Tooltip: Shred utility to securely erase files
Parameters: -f -u -v -z %M
Appears if selection contains: Both
Be sure to check the box “Appears if selection has multiple files or folders“
To finish your configuration, do not forget to open again a Terminal and type: