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
|
.\" Copyright (c) 1997 John S. Kallal (kallal@voicenet.com)
.\"
.\" This is free documentation; you can redistribute it and/or
.\" modify it under the terms of the GNU General Public License as
.\" published by the Free Software Foundation; either version 2 of
.\" the License, or (at your option) any later version.
.\"
.\" Some changes by tytso and aeb.
.\"
.\" Japanese Version Copyright (c) 1998
.\" ISHIKAWA Mutsumi, all rights reserved.
.\" Translated into Japanese Mon Jan 12 03:20:27 JST 1998
.\" by ISHIKAWA Mutsumi <ishikawa@linux.or.jp>
.\"
.\" Japanese Version Last Modified Thu Feb 5 21:08:33 JST 1998
.\" by ISHIKAWA Mutsumi <ishikawa@linux.or.jp>
.\"
.TH RANDOM 4 "August 1, 1997" "Linux" "Linux Programmer's Manual"
.SH ̾
random, urandom \- ͥǥХ
.SH
(Linux 1.3.30 Ƥ) \fB/dev/random\fP
\fB/dev/urandom\fP 饯ڥեϥͥͥ졼
ؤΥե롣
\fB/dev/random\fP եϥ㡼ǥХʥС 1 ޥʡǥХ
ֹ 8 Ǥ롣\fB/dev/urandom\fP ϥ㡼ǥХʥС 1 ޥ
ʡǥХʥС 9 Ǥ롣
.LP
ͥ졼ϥǥХɥ饤Ф䤽¾θδĶΥ
ȥԡסؽ롣
ޤͥ졼ϥȥԡסΥΥӥåȤοθѤ
¸롣
Υȥԡס뤫롣
.LP
ɤ߹ߤԤȡ
\fB/dev/random\fP
ǥХϥȥԡסΥΥӥåȤοɾͤ顢
ХȤΤߤ֤
\fB/dev/random\fP ϥѥå(one-time pad) 丰Τ褦
˹⤤ʼä̵ɬפˤʤŬڤǤ
ȥԡס뤬λϡ\fB/dev/random\fP ɤߤϡ
ʤĶΥޤǡ֥å롣
.LP
ޤ\fB/dev/urandom\fP ǥХɤ߽ФԤ줿ϡ
줿̤ΥХȤ֤η̡⤷ȥԡס˽ʬʥ
ԡ¸ߤʤ硢֤ͤϤΥɥ饤ФǻȤƤ륢르ꥺ
˴ŤŹ湶ФơŪˤϼ夯ʤ뤳Ȥˤʤ롣
ιɤΤ褦˹ԤȤˤĤƤϡ߸ʸʤɤ
ǤϤʤΤ褦ʹŪ¸߲ǽǤ롣
⤷λۤʤ顢(\fB/dev/urandom\fP ǤϤʤ)
\fB/dev/random\fP ѤФ
.SH
ƥˤ餫줿 \fB/dev/random\fP
\fB/dev/urandom\fP ¸ߤʤʤ顢Τ褦ʥޥɤǺǤ롣
.nf
mknod -m 644 /dev/random c 1 8
mknod -m 644 /dev/urandom c 1 9
chown root:root /dev/random /dev/urandom
.fi
ڥ졼ʤ Linux ƥǤưľϡȥԡ
סϰճ˳Ѱʾ֤ˤ
ˤꡢȥԡסμºݤΥΥ̤ɾͤ꾯ʤʤ롣
θ̤Ǥäˡåȥ()ưޤǻۤ
ȥԡסξˤʤ롣
ȥԡסۤˤϡLinux ƥεưưδ֤
륹ץȤŬڤʬˡΤ褦ʹԤդäɤ
.nf
echo "Initializing kernel random number generator..."
# Υåȥ (ޤϡȥå)麣
# ȥåפ˻ۤѤͥ
# 졼ν
# ɤԤθ塢512 ХȤΥȥԡס
# ֤롣
if [ -f /var/random-seed ]; then
cat /var/random-seed >/dev/urandom
fi
dd if=/dev/urandom of=/var/random-seed count=1
.fi
ޤLinux ƥΥåȥ륹ץȤŬڤʬ
Τ褦ʹԤä롣
.nf
# ͥ졼Ѥ뤿ˡΥåȥ顢
# εưޤۤ
# 512 ХȤͥ졼Υȥԡס¸롣
echo "Saving random seed..."
dd if=/dev/urandom of=/var/random-seed count=1
.fi
.SH ե
/dev/random
.br
/dev/urandom
.SH
ͥ롦ʥСͥ졼 Theodora Ts'o
(tytso@athena.mit.edu) ˤäƽ줿
.SH Ϣ
mknod (1)
.br
RFC 1750, "Randomness Recommendations for Security"
.SH
<ishikawa@linux.or.jp>
|
