108 lines
2.4 KiB
Groff
108 lines
2.4 KiB
Groff
.\" This definition swiped from the gcc(1) man page
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.de Sp
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.if n .sp
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.if t .sp 0.4
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..
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.TH SMEM 1
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.SH NAME
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smem \- secure memory wiper (secure_deletion toolkit)
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.SH SYNOPSIS
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.B smem [-f] [-l] [-l] [-v]
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.SH DESCRIPTION
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.I smem
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is designed to delete data which may lie still in your memory (RAM)
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in a secure manner which can not be recovered by thiefs, law enforcement
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or other threats.
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Note that with the new SDRAMs, data will not wither away but will be kept
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static - it is easy to extract the necessary information!
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The wipe algorythm is based on the paper "Secure Deletion of Data from
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Magnetic and Solid-State Memory" presented at the 6th Usenix Security
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Symposium by Peter Gutmann, one of the leading civilian cryptographers.
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.PP
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The
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.I secure data deletion
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process of smem goes like this:
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.PP
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.TP
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.B *
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1 pass with 0x00
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.TP
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.B *
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5 random passes. /dev/urandom is used for a secure RNG if available.
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.TP
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.B *
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27 passes with special values defined by Peter Gutmann.
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.TP
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.B *
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5 random passes. /dev/urandom is used for a secure RNG if available.
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.PP
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.SH COMMANDLINE OPTIONS
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.PP
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.TP
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.B \-f
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fast (and insecure mode): no /dev/urandom.
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.TP
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.B \-l
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lessens the security. Only two passes are written: the first with 0x00
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and a final random one.
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.TP
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.B \-l
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-l for a second time lessons the security even more: only one pass with
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0x00 is written.
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.TP
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.B \-v
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verbose mode
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.PP
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.SH BEWARE
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.TP
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.B SLOW
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Wiping the memory is very slow. You might use smem with the -ll option. (tip)
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.TP
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.B BETA!
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.I smem
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is still beta.
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.PP
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.SH BUGS
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No bugs. There was never a bug in the secure_deletion package (in contrast
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to my other tools, whew, good luck ;-)
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Send me any that you find. Patches are nice too :)
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.SH AUTHOR
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.Sp
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van Hauser / THC
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.I <vh@thc.org>
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.SH DISTRIBUTION
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The newest version of the
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.I secure_deletion package
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can be obtained from
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.I http://www.thc.org
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.Sp
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.I smem
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and the
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.I secure_deletion package
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is (C) 1997-2003 by van Hauser / THC (vh@thc.org)
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.Sp
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; Version 2.
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.Sp
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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.SH SEE ALSO
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.I srm
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(1),
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.I sfill
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(1),
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.I sswap
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(1)
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