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)