sdmem

SDMEM(1)                    General Commands Manual                   SDMEM(1)



NAME
       sdmem - secure memory wiper (secure_deletion toolkit)


SYNOPSIS
       sdmem [-f] [-l] [-l] [-v]


DESCRIPTION
       sdmem is designed to delete data which may lie still in your memory
       (RAM) in a secure manner which can not be recovered by thiefs, law
       enforcement or other threats.  Note that with the new SDRAMs, data will
       not wither away but will be kept static - it is easy to extract the
       necessary information!  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 sdmem goes like this:

       *      1 pass with 0x00

       *      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.

       -l     lessens the security. Only two passes are written: the first
              with 0x00 and a final random one.

       -l     -l for a second time lessons the security even more: only one
              pass with 0x00 is written.

       -v     verbose mode

NOTE
       This utility was originally called
              smem but was renamed for debian to avoid name clashes with
              another package.


BEWARE
       SLOW   Wiping the memory is very slow. You might use sdmem with the -ll
              option. (tip)

       BETA!  sdmem is still beta.


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

       sdmem 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), sswap (1)



                                                                      SDMEM(1)