sswap

SSWAP(1)                    General Commands Manual                   SSWAP(1)



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), smem (1)



                                                                      SSWAP(1)