Using Wipe Tool
Wipe using the Gutmann method, the theoretical basis is the college in 1996 Oakland University computer science professor Peter Gutmann in the sixth session of the USENIX security on the paper, “safely remove magnetic solid memory data”.
mirror as pdf: Peter Gutmann – Secure Deletion of Data from Magnetic and Solid-State Memory.pdf
This is by far the most secure data deleting method, covering data 35 times that any attempt to restore the data are in vain. Wipe uses repeated write 34 times to the random number generation data Gutmann, removal of the object can be a single file, folder and the whole disk. With the hard disk capacity is larger and larger, rewriting the time will be longer, so wipe also provides only 4 times rewritable fast mode.
Type the following command to install wipe tool
apt-get install wipe; # install wipe
Securely Delete a file using wipe command
wipe config.txt; # wipe a file
Securely delete directory using wipe command
wipe -r /tmp; # wipe a directory # example: wipe -r porn/; # wipe a directory with porn, because it could be used against you Okay to WIPE 1 directory ? (Yes/No) Yes # very good! it asks for confirmation Wiping Amber Peach Masturbates At Home., pass 14 (23)
# c'mon guys! 28 PASSES! Really? 😀 (you will have to let it run... otherwise it won't delete it, so sit back, relax, do something else 😀
Delete the entire disk partition a possible
wipe /dev/sdb1; # wipe entire partition (!!! DANGER ! NOT A DIRECTORY !!!)
alternative (tested, unpatient, canceled, took too long, did not really do anything)
Second, use sfill to wipe out unused space on your disk:
sudo sfill -f <directory>; # securely delete a directory