blog/Unlimited_randomness_with_the_ChaosKey_.html

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   6     <title>Petter Reinholdtsen: Unlimited randomness with the ChaosKey?</title>
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  14  <h1>
  15      <a href="http://people.skolelinux.org/pere/blog/">Petter Reinholdtsen</a>
  16
  17  </h1>
  18
  19 </div>
  20
  21
  22     <div class="entry">
  23       <div class="title">Unlimited randomness with the ChaosKey?</div>
  24       <div class="date"> 1st March 2017</div>
  25       <div class="body"><p>A few days ago I ordered a small batch of
  26 <a href="http://altusmetrum.org/ChaosKey/">the ChaosKey</a>, a small
  27 USB dongle for generating entropy created by Bdale Garbee and Keith
  28 Packard.  Yesterday it arrived, and I am very happy to report that it
  29 work great!  According to its designers, to get it to work out of the
  30 box, you need the Linux kernel version 4.1 or later.  I tested on a
  31 Debian Stretch machine (kernel version 4.9), and there it worked just
  32 fine, increasing the available entropy very quickly.  I wrote a small
  33 test oneliner to test.  It first print the current entropy level,
  34 drain /dev/random, and then print the entropy level for five seconds.
  35 Here is the situation without the ChaosKey inserted:</p>
  36
  37 <blockquote><pre>
  38 % cat /proc/sys/kernel/random/entropy_avail; \
  39   dd bs=1M if=/dev/random of=/dev/null count=1; \
  40   for n in $(seq 1 5); do \
  41      cat /proc/sys/kernel/random/entropy_avail; \
  42      sleep 1; \
  43   done
  44 300
  45 0+1 oppføringer inn
  46 0+1 oppføringer ut
  47 28 byte kopiert, 0,000264565 s, 106 kB/s
  48 4
  49 8
  50 12
  51 17
  52 21
  53 %
  54 </pre></blockquote>
  55
  56 <p>The entropy level increases by 3-4 every second.  In such case any
  57 application requiring random bits (like a HTTPS enabled web server)
  58 will halt and wait for more entrpy.  And here is the situation with
  59 the ChaosKey inserted:</p>
  60
  61 <blockquote><pre>
  62 % cat /proc/sys/kernel/random/entropy_avail; \
  63   dd bs=1M if=/dev/random of=/dev/null count=1; \
  64   for n in $(seq 1 5); do \
  65      cat /proc/sys/kernel/random/entropy_avail; \
  66      sleep 1; \
  67   done
  68 1079
  69 0+1 oppføringer inn
  70 0+1 oppføringer ut
  71 104 byte kopiert, 0,000487647 s, 213 kB/s
  72 433
  73 1028
  74 1031
  75 1035
  76 1038
  77 %
  78 </pre></blockquote>
  79
  80 <p>Quite the difference. :) I bought a few more than I need, in case
  81 someone want to buy one here in Norway. :)</p>
  82
  83 <p>Update: The dongle was presented at Debconf last year.  You might
  84 find <a href="https://debconf16.debconf.org/talks/94/">the talk
  85 recording illuminating</a>.  It explains exactly what the source of
  86 randomness is, if you are unable to spot it from the schema drawing
  87 available from the ChaosKey web site linked at the start of this blog
  88 post.</p>
  89 </div>
  90
  91       <div class="tags">Tags: <a href="http://people.skolelinux.org/pere/blog/tags/debian">debian</a>, <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>.</div>
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 485  <li><a href="http://people.skolelinux.org/pere/blog/tags/nice free software">nice free software (11)</a></li>
 486
 487  <li><a href="http://people.skolelinux.org/pere/blog/tags/norsk">norsk (304)</a></li>
 488
 489  <li><a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug (192)</a></li>
 490
 491  <li><a href="http://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn (35)</a></li>
 492
 493  <li><a href="http://people.skolelinux.org/pere/blog/tags/open311">open311 (2)</a></li>
 494
 495  <li><a href="http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (73)</a></li>
 496
 497  <li><a href="http://people.skolelinux.org/pere/blog/tags/personvern">personvern (108)</a></li>
 498
 499  <li><a href="http://people.skolelinux.org/pere/blog/tags/raid">raid (2)</a></li>
 500
 501  <li><a href="http://people.skolelinux.org/pere/blog/tags/reactos">reactos (1)</a></li>
 502
 503  <li><a href="http://people.skolelinux.org/pere/blog/tags/reprap">reprap (11)</a></li>
 504
 505  <li><a href="http://people.skolelinux.org/pere/blog/tags/rfid">rfid (3)</a></li>
 506
 507  <li><a href="http://people.skolelinux.org/pere/blog/tags/robot">robot (11)</a></li>
 508
 509  <li><a href="http://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
 510
 511  <li><a href="http://people.skolelinux.org/pere/blog/tags/ruter">ruter (7)</a></li>
 512
 513  <li><a href="http://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (2)</a></li>
 514
 515  <li><a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (55)</a></li>
 516
 517  <li><a href="http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (4)</a></li>
 518
 519  <li><a href="http://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (5)</a></li>
 520
 521  <li><a href="http://people.skolelinux.org/pere/blog/tags/standard">standard (58)</a></li>
 522
 523  <li><a href="http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (6)</a></li>
 524
 525  <li><a href="http://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (12)</a></li>
 526
 527  <li><a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (55)</a></li>
 528
 529  <li><a href="http://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (4)</a></li>
 530
 531  <li><a href="http://people.skolelinux.org/pere/blog/tags/usenix">usenix (2)</a></li>
 532
 533  <li><a href="http://people.skolelinux.org/pere/blog/tags/valg">valg (9)</a></li>
 534
 535  <li><a href="http://people.skolelinux.org/pere/blog/tags/verkidetfri">verkidetfri (15)</a></li>
 536
 537  <li><a href="http://people.skolelinux.org/pere/blog/tags/video">video (73)</a></li>
 538
 539  <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
 540
 541  <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (42)</a></li>
 542
 543 </ul>
 544
 545
 546     </div>
 547     <p style="text-align: right">
 548  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 549 </p>
 550
 551   </body>
 552 </html>