Import translated manuals from JM CVS Repository.

[linuxjm/jm.git] / manual / LDP_man-pages / release / man4 / random.4

.\" 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.
.\"
.\" 2004-12-16, John V. Belmonte/mtk, Updated init and quit scripts
.\" 2004-04-08, AEB, Improved description of read from /dev/urandom
.\" 2008-06-20, George Spelvin <linux@horizon.com>,
.\"             Matt Mackall <mpm@selenic.com>
.\"     Add a Usage subsection that recommends most users to use
.\"     /dev/urandom, and emphasizes parsimonious usage of /dev/random.
.\"
.\" 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>
.\" Updated & Modified Sun Jun  6 14:48:03 JST 2004
.\"     by Yuichi SATO <ysato444@yahoo.co.jp>
.\" Updated & Modified Tue Jan 18 04:21:16 JST 2005 by Yuichi SATO
.\" Updated & Modified Fri Apr 22 03:44:01 JST 2005 by Yuichi SATO
.\" Updated 2008-08-13, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>, LDP v3.05
.\"
.\"WORD:        random generator        Íð¿ô¥¸¥§¥Í¥ì¡¼¥¿
.\"
.TH RANDOM 4 2008-06-20 "Linux" "Linux Programmer's Manual"
.SH ̾Á°
random, urandom \- ¥«¡¼¥Í¥ëÍð¿ô¥½¡¼¥¹¥Ç¥Ð¥¤¥¹
.SH ÀâÌÀ
(Linux 1.3.30 ¤«¤éÄ󶡤µ¤ì¤Æ¤¤¤ë) \fI/dev/random\fP ¡¢
\fI/dev/urandom\fP ¥­¥ã¥é¥¯¥¿¥¹¥Ú¥·¥ã¥ë¥Õ¥¡¥¤¥ë¤Ï
¥«¡¼¥Í¥ëÍð¿ô¥¸¥§¥Í¥ì¡¼¥¿¤Ø¤Î¥¤¥ó¥¿¥Õ¥§¡¼¥¹¤òÄ󶡤¹¤ë¡£
\fI/dev/random\fP ¥Õ¥¡¥¤¥ë¤Ï¥á¥¸¥ã¡¼¥Ç¥Ð¥¤¥¹ÈÖ¹æ 1
¥Þ¥¤¥Ê¡¼¥Ç¥Ð¥¤¥¹ÈÖ¹æ 8 ¤Ç¤¢¤ë¡£
\fI/dev/urandom\fP ¤Ï¥á¥¸¥ã¡¼¥Ç¥Ð¥¤¥¹ÈÖ¹æ 1
¥Þ¥¤¥Ê¡¼¥Ç¥Ð¥¤¥¹ÈÖ¹æ 9 ¤Ç¤¢¤ë¡£
.LP
Íð¿ô¥¸¥§¥Í¥ì¡¼¥¿¤Ï¥Ç¥Ð¥¤¥¹¥É¥é¥¤¥Ð¤ä¤½¤Î¾¤Î¸»¤«¤é¤Î´Ä¶­¥Î¥¤¥º¤ò
¥¨¥ó¥È¥í¥Ô¡¼¡¦¥×¡¼¥ë¤Ø½¸¤á¤ë¡£
¤Þ¤¿¡¢¥¸¥§¥Í¥ì¡¼¥¿¤Ï¥¨¥ó¥È¥í¥Ô¡¼¡¦¥×¡¼¥ëÆâ¤Î¥Î¥¤¥º¤Î¥Ó¥Ã¥È¿ô¤Î¿äÄêÃͤò
ÊÝ»ý¤¹¤ë¡£
¤³¤Î¥¨¥ó¥È¥í¥Ô¡¼¡¦¥×¡¼¥ë¤«¤éÍð¿ô¤¬À¸À®¤µ¤ì¤ë¡£
.LP
Æɤ߹þ¤ß¤¬¹Ô¤ï¤ì¤ë¤È¡¢
\fI/dev/random\fP
¥Ç¥Ð¥¤¥¹¤Ï¥¨¥ó¥È¥í¥Ô¡¼¡¦¥×¡¼¥ë¤Î¥Î¥¤¥º¥Ó¥Ã¥È¤Î¿ô¤Î¿äÄêÃͤΤ¦¤Á¡¢
¥é¥ó¥À¥à¥Ð¥¤¥È¤Î¤ß¤òÊÖ¤¹¡£
\fI/dev/random\fP ¤Ï¥ï¥ó¥¿¥¤¥à¥Ñ¥Ã¥É (one-time pad) ¤ä¸°¤ÎÀ¸À®¤Î¤è¤¦¤Ê
Èó¾ï¤Ë¹â¤¤ÉʼÁ¤ò»ý¤Ã¤¿Ìµºî°ÙÀ­¤¬É¬ÍפˤʤëÍÑÅӤ˸þ¤¤¤Æ¤¤¤ë¤À¤í¤¦¡£
¥¨¥ó¥È¥í¥Ô¡¼¡¦¥×¡¼¥ë¤¬¶õ¤Î»þ¤Ï¡¢\fI/dev/random\fP ¤«¤é¤ÎÆɤ߽Ф·¤Ï¡¢
¹¹¤Ê¤ë´Ä¶­¥Î¥¤¥º¤¬ÆÀ¤é¤ì¤ë¤Þ¤Ç¡¢¥Ö¥í¥Ã¥¯¤µ¤ì¤ë¡£
.LP
\fI/dev/urandom\fP ¥Ç¥Ð¥¤¥¹¤«¤éÆɤ߽Ф·¤Ç¤Ï¡¢
¥¨¥ó¥È¥í¥Ô¡¼¤¬¤è¤ê¹â¤¯¤Ê¤ë¤Î¤òÂԤĤ¿¤á¤Î¥Ö¥í¥Ã¥¯¤Ï¹Ô¤ï¤ì¤Ê¤¤¡£
¤½¤Î·ë²Ì¡¢¤â¤·¥¨¥ó¥È¥í¥Ô¡¼¡¦¥×¡¼¥ë¤Ë½½Ê¬¤Ê¥¨¥ó¥È¥í¥Ô¡¼¤¬Â¸ºß¤·¤Ê¤¤¾ì¹ç¡¢
ÊÖ¤êÃͤϤ³¤Î¥É¥é¥¤¥Ð¤Ç»È¤ï¤ì¤Æ¤¤¤ë¥¢¥ë¥´¥ê¥º¥à¤Ë´ð¤Å¤¯°Å¹æ¹¶·â¤ËÂФ·¤Æ¡¢
ÏÀÍýŪ¤Ë¤Ï¼å¤¯¤Ê¤ë¤³¤È¤Ë¤Ê¤ë¡£
¤³¤Î¹¶·â¤ò¤É¤Î¤è¤¦¤Ë¹Ô¤¦¤«¤È¤¤¤¦»ö¤Ë¤Ä¤¤¤Æ¤Ï¡¢¸½ºß¸¦µæÏÀʸ¤Ê¤É¤Î
·Á¤ÇÆþ¼ê¤Ç¤­¤ë»ñÎÁ¤Ï¤Ê¤¤¡¢¤·¤«¤·¡¢¤½¤Î¤è¤¦¤Ê¹¶·â¤ÏÏÀÍýŪ¤Ë¸ºß²Äǽ¤Ç¤¢¤ë¡£
¤â¤·¡¢¤³¤Î»ö¤¬¿´Çۤʤ顢(\fI/dev/urandom\fP ¤Ç¤Ï¤Ê¤¯)
\fI/dev/random\fP ¤òÍøÍѤ¹¤ì¤Ð¤¤¤¤¡£
.SS »È¤¤Êý
.I /dev/random
¤È
.I /dev/urandom
¤Î¤É¤Á¤é¤ò»È¤¦¤Ù¤­¤«Ì¤ä¿¾ì¹ç¡¢¤¿¤¤¤Æ¤¤¤Ï
.I /dev/urandom
¤ÎÊý¤ò»È¤¤¤¿¤¤¤È»×¤Ã¤Æ¤¤¤ë¤Ï¤º¤À¤í¤¦¡£
°ìÈ̤ˡ¢Ä¹´ü¤ËÅϤäƻȤï¤ì¤ë GPG/SSL/SSH ¤Î¥­¡¼°Ê³°¤ÎÁ´¤Æ¤Î¤â¤Î¤Ë
.I /dev/urandom
¤ò»ÈÍѤ¹¤Ù¤­¤Ç¤¢¤ë¡£

²¼µ­¤Ç¿ä¾©¤·¤Æ¤¤¤ë¤è¤¦¤ËºÆµ¯Æ°¤ÎÁ°¸å¤ÇÍð¿ô¼ï¥Õ¥¡¥¤¥ë¤¬Êݸ¤µ¤ì¤ë¾ì¹ç
(Á´¤Æ¤Î¼ç¤Ê Linux ¤Î¥Ç¥£¥¹¥È¥ê¥Ó¥å¡¼¥·¥ç¥ó¤Ï¾¯¤Ê¤¯¤È¤â 2000 ǯ°Ê¹ß¤Ï
Íð¿ô¼ï¤òÊݸ¤¹¤ë¤è¤¦¤Ë¤Ê¤Ã¤Æ¤¤¤ë)¡¢µ¯Æ°¥·¡¼¥±¥ó¥¹¤Ë¤ª¤¤¤ÆÍð¿ô¼ï¤¬
ºÆ¥í¡¼¥É¤µ¤ì¤¿Ä¾¸å¤«¤é¡¢¤½¤Î½ÐÎÏ¤Ï¥í¡¼¥«¥ë¤Î¥ë¡¼¥È¥¢¥¯¥»¥¹¤¬¤Ç¤­¤Ê¤¤
¹¶·â¼Ô¤ËÂФ·¤Æ°Å¹æŪ¤Ë°ÂÁ´¤Ê¤â¤Î¤È¤Ê¤ê¡¢¥Í¥Ã¥È¥ï¡¼¥¯°Å¹æ²½¤Î¥»¥Ã¥·¥ç¥ó¥­¡¼
¤È¤·¤Æ»È¤¦¤Ë¤Ï´°Á´¤ËºÇŬ¤Ê¤â¤Î¤È¤Ê¤ë¡£
.I /dev/random
¤«¤é¤ÎÆɤ߽Ф·¤ÏÄä»ß (block) ¤¹¤ë²ÄǽÀ­¤¬¤¢¤ë¤Î¤Ç¡¢¥æ¡¼¥¶¤ÏÉáÄÌ
¤³¤Î¥Õ¥¡¥¤¥ë¤òÈóÄä»ß (nonblocking) ¥â¡¼¥É¤Ç³«¤³¤¦¤È¤·
(¤â¤·¤¯¤Ï¥¿¥¤¥à¥¢¥¦¥È¤ò»ØÄꤷ¤ÆÆɤ߽Ф·¤ò¼Â¹Ô¤·)¡¢´õ˾¤¹¤ë¥ì¥Ù¥ë¤Î
¥¨¥ó¥È¥í¥Ô¡¼¤Ï¤¹¤°¤Ë¤ÏÍøÍѤǤ­¤Ê¤¤¾ì¹ç¤Ë¤Ï¡¢²¿¤é¤«¤ÎÄÌÃΤò¹Ô¤¦¤³¤È¤À¤í¤¦¡£

¥«¡¼¥Í¥ë¤ÎÍð¿ô¥¸¥§¥Í¥ì¡¼¥¿¤Ï¡¢°Å¹æµ¿»÷Íð¿ô¥¸¥§¥Í¥ì¡¼¥¿ (Cryptographic
pseudo-random number generator; CPRNG) ¤Î¼ï¤È¤·¤Æ»ÈÍѤǤ­¤ë
¹âÉʼÁ¤ÊÍð¿ô¼ï¤ÎºàÎÁ¤ò¾¯¤·À¸À®¤¹¤ë¤¿¤á¤ËÀ߷פµ¤ì¤Æ¤¤¤ë¡£
¤³¤ì¤Ï®Å٤ǤϤʤ¯°ÂÁ´À­¤ò½Å»ë¤·¤ÆÀ߷פµ¤ì¤Æ¤ª¤ê¡¢
¥é¥ó¥À¥à¤Ê¥Ç¡¼¥¿¤òÂçÎ̤ËÀ¸À®¤¹¤ë¤Î¤Ë¤ÏÁ´¤¯¤â¤Ã¤ÆŬ¤·¤Æ¤¤¤Ê¤¤¡£
¥æ¡¼¥¶¤Ï
.I /dev/urandom
(¤È
.IR /dev/random )
¤«¤éÆɤ߽Ф¹Íð¿ô¼ï¤ÎºàÎÁ¤ÎÎ̤ò¤Ç¤­¤ë¤À¤±ÀáÌ󤹤٤­¤Ç¤¢¤ë¡£
¤³¤Î¥Ç¥Ð¥¤¥¹¤«¤éÉÔɬÍפËÂçÎ̤Υǡ¼¥¿¤òÆɤ߽Ф¹¤È¡¢¤³¤Î¥Ç¥Ð¥¤¥¹¤ò»È¤¦
¾¤Î¥æ¡¼¥¶¤Ë¥Þ¥¤¥Ê¥¹¤Î±Æ¶Á¤òÍ¿¤¨¤Æ¤·¤Þ¤¦¤À¤í¤¦¡£

°Å¹æ¸°¤òÀ¸À®¤¹¤ë¤Î¤ËɬÍפÊÍð¿ô¼ï¤ÎºàÎÁ¤ÎÎ̤ϡ¢¸°¤Î¼Â¸ú¥µ¥¤¥º¤ÈƱ¤¸¤Ç¤¢¤ë¡£
Î㤨¤Ð¡¢3072 ¥Ó¥Ã¥È¤Î RSA ¤ª¤è¤Ó Diffie-Hellman ¤ÎÈëÌ©¸°¤Î¼Â¸ú¥µ¥¤¥º¤Ï
128 ¥Ó¥Ã¥È (¤³¤ÎÈëÌ©¸°¤òÇˤë¤Ë¤Ï 2^128 ²ó¤ÎÁàºî¤¬É¬ÍפȤ¤¤¦¤³¤È) ¤Ç¤¢¤ê¡¢
¤½¤Î¤¿¤á¸°À¸À®´ï¤¬
.I /dev/random
¤«¤éÆɤ߽Ф¹É¬Íפ¬¤¢¤ëÍð¿ô¼ï¤ÎºàÎÁ¤ÎÎÌ¤Ï 128 ¥Ó¥Ã¥È (16 ¥Ð¥¤¥È) ¤À¤±¤Ç¤¢¤ë¡£

CPRNG ¥¢¥ë¥´¥ê¥º¥à¤Î·ç´Ù¤ËÂФ¹¤ëÊݸî¤È¤·¤Æ¡¢¤³¤ÎºÇ¾®ÃͤËÂФ·¤Æ¤¤¤¯¤é¤«¤Î
°ÂÁ´¾å¤Î¥Þ¡¼¥¸¥ó¤ò¼è¤ë¤Î¤Ï¤â¤Ã¤È¤â¤À¤¬¡¢¸½ºßÍøÍѲÄǽ¤Ê°Å¹æ¥×¥ê¥ß¥Æ¥£¥Ö¤Ç
256 ¥Ó¥Ã¥È¤è¤ê¿¤¯¤Î°ÂÁ´¤ÊÍð¿ô¤òɬÍפȤ¹¤ë¤è¤¦¤Ê¤â¤Î¤Ï¤Ê¤¤¡£
µ¯Æ°¤¹¤ëÅ٤ˡ¢¤â¤·¤¯¤ÏÍð¿ô¼ï¤òÊѹ¹¤¹¤ëÂÅÅö¤Ê´Ö³Ö (1 ʬ¤è¤êû¤¯¤Ê¤ë¤³¤È¤Ï¤Ê¤¤)
¤ÎÅ٤ˡ¢¥«¡¼¥Í¥ë¤ÎÍð¿ô¥×¡¼¥ë¤«¤é 256 ¥Ó¥Ã¥È (32 ¥Ð¥¤¥È) ¤è¤ê¤¿¤¯¤µ¤óÆɤ߽Ф¹
¤è¤¦¤Ê¾ì¹ç¤Ë¤Ï¡¢¤½¤Î¥×¥í¥°¥é¥à¤Î°Å¹æ½èÍý¤¬¤¦¤Þ¤¯¼ÂÁõ¤µ¤ì¤Æ¡Ö¤¤¤Ê¤¤¡×²ÄǽÀ­¤¬
¤¢¤ë¤È¹Í¤¨¤ë¤Ù¤­¤Ç¤¢¤í¤¦¡£
.SS ÀßÄê
¥·¥¹¥Æ¥à¤Ë¤¢¤é¤«¤¸¤áºîÀ®¤µ¤ì¤¿ \fI/dev/random\fP ¤È
\fI/dev/urandom\fP ¤¬Â¸ºß¤·¤Ê¤¤¤Ê¤é¡¢¼¡¤Î¤è¤¦¤Ê¥³¥Þ¥ó¥É¤ÇºîÀ®¤Ç¤­¤ë¡£
.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

¥ª¥Ú¥ì¡¼¥¿¤ÎÁàºî¤Ê¤·¤Ë Linux ¥·¥¹¥Æ¥à¤¬µ¯Æ°¤·¤¿Ä¾¸å¤Ï¡¢
¥¨¥ó¥È¥í¥Ô¡¼¡¦¥×¡¼¥ë¤Ï°Õ³°À­¤Î˳¤·¤¤¶Ñ°ì¤Ê¾õÂ֤ˤ¢¤ë¤À¤í¤¦¡£
¤³¤ì¤Ë¤è¤ê¡¢¥¨¥ó¥È¥í¥Ô¡¼¡¦¥×¡¼¥ë¤Î¼ÂºÝ¤Î¥Î¥¤¥ºÎ̤Ïɾ²ÁÃͤè¤ê¾¯¤Ê¤¯¤Ê¤ë¡£
¤³¤Î¸ú²Ì¤òÂǤÁ¾Ã¤¹¤¿¤á¤Ë¡¢¥·¥ã¥Ã¥È¥À¥¦¥ó¤«¤é (¼¡¤Î) µ¯Æ°»þ¤Þ¤Ç»ý¤Á±Û¤·¤¿
¥¨¥ó¥È¥í¥Ô¡¼¡¦¥×¡¼¥ë¤Î¾ðÊ󤬽õ¤±¤Ë¤Ê¤ë¡£
¥¨¥ó¥È¥í¥Ô¡¼¡¦¥×¡¼¥ë¤ò»ý¤Á±Û¤¹¤¿¤á¤Ë¤Ï¡¢
Linux ¥·¥¹¥Æ¥à¤Îµ¯Æ°»þ¤Ë¼Â¹Ô¤µ¤ì¤ëŬÀڤʥ¹¥¯¥ê¥×¥È¤Ë¡¢
°Ê²¼¤Î¹Ô¤òÄɲ乤ì¤Ð¤è¤¤:
.nf

    echo "Initializing random number generator..."
    random_seed=/var/run/random-seed
    # Íð¿ô¼ï¤òº£²ó¤Î¥¹¥¿¡¼¥È¥¢¥Ã¥×¤«¤é¼¡²ó¤Î¥¹¥¿¡¼¥È¥¢¥Ã¥×¤Þ¤Ç»ý¤Á±Û¤¹¡£
    # ¥í¡¼¥É¤ò¹Ô¤¤¡¢¤½¤Î¸å¡¢Á´¤Æ¤Î¥¨¥ó¥È¥í¥Ô¡¼¡¦¥×¡¼¥ë¤òÊݸ¤¹¤ë¡£
    if [ \-f $random_seed ]; then
        cat $random_seed >/dev/urandom
    else
        touch $random_seed
    fi
    chmod 600 $random_seed
    poolfile=/proc/sys/kernel/random/poolsize
    [ \-r $poolfile ] && bytes=\`cat $poolfile\` || bytes=512
    dd if=/dev/urandom of=$random_seed count=1 bs=$bytes
.fi

¤Þ¤¿¡¢Linux ¥·¥¹¥Æ¥à¤Î¥·¥ã¥Ã¥È¥À¥¦¥ó»þ¤Ë¼Â¹Ô¤µ¤ì¤ëŬÀڤʥ¹¥¯¥ê¥×¥È¤Ë¡¢
°Ê²¼¤Î¹Ô¤òÄɲ乤ì¤Ð¤è¤¤:
.nf

    # Íð¿ô¼ï¤òº£²ó¤Î¥·¥ã¥Ã¥È¥À¥¦¥ó¤«¤é¼¡²ó¤Î¥¹¥¿¡¼¥È¥¢¥Ã¥×¤Þ¤Ç»ý¤Á±Û¤¹¡£
    # Á´¤Æ¤Î¥¨¥ó¥È¥í¥Ô¡¼¡¦¥×¡¼¥ë¤òÊݸ¤¹¤ë¡£
    echo "Saving random seed..."
    random_seed=/var/run/random-seed
    touch $random_seed
    chmod 600 $random_seed
    poolfile=/proc/sys/kernel/random/poolsize
    [ \-r $poolfile ] && bytes=\`cat $poolfile\` || bytes=512
    dd if=/dev/urandom of=$random_seed count=1 bs=$bytes
.fi
.SS "/proc ¥¤¥ó¥¿¥Õ¥§¡¼¥¹"
¥Ç¥£¥ì¥¯¥È¥ê
.I /proc/sys/kernel/random
¤Ë¤¢¤ë¥Õ¥¡¥¤¥ë (2.3.16 ¤«¤é¸ºß¤¹¤ë) ¤Ï¡¢
.I /dev/random
¥Ç¥Ð¥¤¥¹¤Ø¤Î¤½¤Î¾¤Î¥¤¥ó¥¿¥Õ¥§¡¼¥¹¤òÄ󶡤¹¤ë¡£
.LP
Æɤ߹þ¤ßÀìÍѤΥե¡¥¤¥ë
.I entropy_avail
¤Ï»ÈÍѲÄǽ¤Ê¥¨¥ó¥È¥í¥Ô¡¼¤òɽ¤¹¡£
Ä̾¤³¤ì¤Ï 4096 (¥Ó¥Ã¥È) ¤Ë¤Ê¤ê¡¢¥¨¥ó¥È¥í¥Ô¡¼¡¦¥×¡¼¥ë¤¬ËþÇդξõÂ֤Ǥ¢¤ë¡£
.LP
¥Õ¥¡¥¤¥ë
.I poolsize
¤Ï¥¨¥ó¥È¥í¥Ô¡¼¡¦¥×¡¼¥ë¤Î¥µ¥¤¥º¤òɽ¤¹¡£
¤³¤Î¥Õ¥¡¥¤¥ë¤Î°ÕÌ£¤Ï¥«¡¼¥Í¥ë¥Ð¡¼¥¸¥ç¥ó¤Ë¤è¤ê°Û¤Ê¤ë¡£
.RS
.TP 12
Linux 2.4:
¤³¤Î¥Õ¥¡¥¤¥ë¤Ï¥¨¥ó¥È¥í¥Ô¡¼¡¦¥×¡¼¥ë¤Î¥µ¥¤¥º¤ò¡Ö¥Ð¥¤¥È¡×ñ°Ì¤Çµ¬Äꤹ¤ë¡£
Ä̾¤³¤Î¥Õ¥¡¥¤¥ë¤ÎÃÍ¤Ï 512 ¤Ë¤Ê¤ë¤¬¡¢½ñ¤­¹þ¤ß²Äǽ¤Ç¤¢¤ê¡¢
¥¢¥ë¥´¥ê¥º¥à¤ÇÍøÍѲÄǽ¤ÊǤ°Õ¤ÎÃͤËÊѹ¹¤Ç¤­¤ë¡£
ÁªÂò²Äǽ¤ÊÃÍ¤Ï 32, 64, 128, 256, 512, 1024, 2048 ¤Ç¤¢¤ë¡£
.TP
Linux 2.6:
¤³¤Î¥Õ¥¡¥¤¥ë¤ÏÆɤ߽Ф·ÀìÍѤǤ¢¤ê¡¢
¥¨¥ó¥È¥í¥Ô¡¼¡¦¥×¡¼¥ë¤Î¥µ¥¤¥º¤ò¡Ö¥Ó¥Ã¥È¡×ñ°Ì¤Çµ¬Äꤹ¤ë¡£
ÃÍ¤Ï 4096 ¤Ç¤¢¤ë¡£
.RE
.LP
¥Õ¥¡¥¤¥ë
.I read_wakeup_threshold
¤Ï
.I /dev/random
¤«¤é¤Î¥¨¥ó¥È¥í¥Ô¡¼¤òÂԤäƵٻߤ·¤Æ¤¤¤ë¥×¥í¥»¥¹¤òµ¯¤³¤¹¤Î¤ËɬÍפÊ
¥¨¥ó¥È¥í¥Ô¡¼¤Î¥Ó¥Ã¥È¿ô¤òÊÝ»ý¤·¤Æ¤¤¤ë¡£
¥Ç¥Õ¥©¥ë¥È¤Ï 64 ¤Ç¤¢¤ë¡£
¥Õ¥¡¥¤¥ë
.I write_wakeup_threshold
¤Ï¥¨¥ó¥È¥í¥Ô¡¼¤Î¥Ó¥Ã¥È¿ô¤òÊÝ»ý¤·¤Æ¤ª¤ê¡¢¤³¤ÎÃͰʲ¼¤Ë¤Ê¤Ã¤¿¤é
.I /dev/random
¤Ø¤Î½ñ¤­¹þ¤ß¥¢¥¯¥»¥¹¤Î¤¿¤á¤Ë
.BR select (2)
¤Þ¤¿¤Ï
.BR poll (2)
¤ò¼Â¹Ô¤¹¤ë¥×¥í¥»¥¹¤òµ¯¤³¤¹¡£
¤³¤ÎÃͤϥե¡¥¤¥ë¤Ë½ñ¤­¹þ¤ß¤ò¹Ô¤¦¤³¤È¤Ë¤è¤Ã¤ÆÊѹ¹¤Ç¤­¤ë¡£
.LP
Æɤ߹þ¤ßÀìÍѤΥե¡¥¤¥ë
.I uuid
¤È
.I boot_id
¤Ï 6fd5a44b-35f4-4ad4-a9b9-6b9be13e1fe9 ¤Î¤è¤¦¤Ê
¥é¥ó¥À¥à¤Êʸ»úÎó¤òÊÝ»ý¤·¤Æ¤¤¤ë¡£
Á°¼Ô¤ÏÆɤ߹þ¤ß¤ÎÅ٤˿·¤¿¤ËÀ¸À®¤µ¤ì¡¢
¸å¼Ô¤Ï 1 ÅÙ¤À¤±À¸À®¤µ¤ì¤ë¡£
.SH ¥Õ¥¡¥¤¥ë
/dev/random
.br
/dev/urandom
.\" .SH Ãø¼Ô
.\" ¥«¡¼¥Í¥ë¡¦¥é¥ó¥À¥à¥Ê¥ó¥Ð¡¼¡¦¥¸¥§¥Í¥ì¡¼¥¿¤Ï Theodora Ts'o
.\" (tytso@athena.mit.edu) ¤Ë¤è¤Ã¤Æ½ñ¤«¤ì¤¿¡£
.SH ´ØÏ¢¹àÌÜ
mknod (1)
.br
RFC\ 1750, "Randomness Recommendations for Security"
.\" .SH ËÝÌõ¼Ô
.\" ÀÐÀî ËÓ <ishikawa@linux.or.jp>