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SMEM(1) General Commands Manual SMEM(1) NAME smem - secure memory wiper (secure_deletion toolkit) SYNOPSIS smem [-f] [-l] [-l] [-v] DESCRIPTION smem 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 en- forcement 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 "Se- cure Deletion of Data from Magnetic and Solid-State Memory" presented at the 6th Usenix Security Symposium by Peter Gutmann, one of the lead- ing civilian cryptographers. The secure data deletion process of smem goes like this: * 1 pass with 0x00 * 5 random passes. /dev/urandom is used for a secure RNG if avail- able. * 27 passes with special values defined by Peter Gutmann. * 5 random passes. /dev/urandom is used for a secure RNG if avail- able. 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 BEWARE SLOW Wiping the memory is very slow. You might use smem with the -ll option. (tip) BETA! smem is still beta. BUGS No bugs. There was never a bug in the secure_deletion package (in con- trast 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 smem 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 MER- CHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. SEE ALSO srm (1), sfill (1), sswap (1) SMEM(1)
NAME | SYNOPSIS | DESCRIPTION | COMMANDLINE OPTIONS | BEWARE | BUGS | AUTHOR | DISTRIBUTION | SEE ALSO
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