NAME
sswap - secure swap wiper (secure_deletion toolkit)
SYNOPSIS
sswap [-f] [-l] [-l] [-v] [-z] swapdevice
DESCRIPTION
sswap is designed to delete data which may lie still on your swapspace
in a secure manner which can not be recovered by thiefs, law
enforcement or other threats. The wipe algorythm is based on the paper
"Secure Deletion of Data from Magnetic and Solid-State Memory"
presented at the 6th Usenix Security Symposium by Peter Gutmann, one of
the leading civilian cryptographers.
The secure data deletion process of sswap goes like this:
* 1 pass with 0xff
* 5 random passes. /dev/urandom is used for a secure RNG if
available.
* 27 passes with special values defined by Peter Gutmann.
* 5 random passes. /dev/urandom is used for a secure RNG if
available.
COMMANDLINE OPTIONS
-f fast (and insecure mode): no /dev/urandom, no synchronize mode.
-l lessens the security. Only two passes are written: one mode with
0xff and a final mode with random values.
-l -l for a second time lessons the security even more: only one
pass with random values is written.
-v verbose mode
-z wipes the last write with zeros instead of random data
BEWARE
swapoff
unmount your swapspace before using this tool! Otherwise your
system might crash!
BETA! sswap is still beta. It was only tested on Linux but on this
system it performed it’s work all of the time.
BUGS
No bugs. There was never a bug in the secure_deletion package (in
contrast to my other tools, whew, good luck ;-) Send me any that you
find. Patches are nice too :)
AUTHOR
van Hauser / THC <vh@thc.org>
DISTRIBUTION
The newest version of the secure_deletion package can be obtained from
http://www.thc.org
sswap and the secure_deletion package is (C) 1997-2003 by van Hauser /
THC (vh@thc.org)
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; Version 2.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
SEE ALSO
srm (1), sfill (1), sdmem (1)