1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
|
.\" This definition swiped from the gcc(1) man page
.de Sp
.if n .sp
.if t .sp 0.4
..
.TH SDMEM 1
.SH NAME
sdmem \- secure memory wiper (secure_deletion toolkit)
.SH SYNOPSIS
.B sdmem [-f] [-l] [-l] [-v]
.SH DESCRIPTION
.I sdmem
is designed to delete data which may lie still in your memory (RAM)
in a secure manner which can not be recovered by thieves, 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 algorithm 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.
.PP
The
.I secure data deletion
process of sdmem goes like this:
.PP
.TP
.B *
1 pass with 0x00
.TP
.B *
5 random passes. /dev/urandom is used for a secure RNG if available.
.TP
.B *
27 passes with special values defined by Peter Gutmann.
.TP
.B *
5 random passes. /dev/urandom is used for a secure RNG if available.
.PP
.SH COMMANDLINE OPTIONS
.PP
.TP
.B \-f
fast (and insecure mode): no /dev/urandom.
.TP
.B \-l
lessens the security. Only two passes are written: the first with 0x00
and a final random one.
.TP
.B \-l
-l for a second time lessons the security even more: only one pass with
0x00 is written.
.TP
.B \-v
verbose mode
.PP
.SH NOTE
.TP
This utility was originally called
.I smem
but was renamed for debian to avoid name clashes with another package.
.SH BEWARE
.TP
.B SLOW
Wiping the memory is very slow. You might use sdmem with the -ll option. (tip)
.TP
.B BETA!
.I sdmem
is still beta.
.PP
.SH 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 :)
.SH AUTHOR
.Sp
van Hauser / THC
.I <vh@thc.org>
.SH DISTRIBUTION
The newest version of the
.I secure_deletion package
can be obtained from
.I http://www.thc.org
.Sp
.I sdmem
and the
.I secure_deletion package
is (C) 1997-2003 by van Hauser / THC (vh@thc.org)
.Sp
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.
.Sp
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.
.SH SEE ALSO
.I srm
(1),
.I sfill
(1),
.I sswap
(1)
|
