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="https://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="https://people.skolelinux.org/pere/blog/tags/debian">debian</a>, <a href="https://people.skolelinux.org/pere/blog/tags/english">english</a>.</div>
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 355 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/01/">January (2)</a></li>
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 376
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 378
 379 </ul></li>
 380
 381 <li>2013
 382 <ul>
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 384 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/01/">January (11)</a></li>
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 407
 408 </ul></li>
 409
 410 <li>2012
 411 <ul>
 412
 413 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/01/">January (7)</a></li>
 414
 415 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/02/">February (10)</a></li>
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 436
 437 </ul></li>
 438
 439 <li>2011
 440 <ul>
 441
 442 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/01/">January (16)</a></li>
 443
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 464 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/12/">December (1)</a></li>
 465
 466 </ul></li>
 467
 468 <li>2010
 469 <ul>
 470
 471 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
 472
 473 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
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 493 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
 494
 495 </ul></li>
 496
 497 <li>2009
 498 <ul>
 499
 500 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
 501
 502 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
 503
 504 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/03/">March (12)</a></li>
 505
 506 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/04/">April (10)</a></li>
 507
 508 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/05/">May (9)</a></li>
 509
 510 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/06/">June (3)</a></li>
 511
 512 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/07/">July (4)</a></li>
 513
 514 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/08/">August (3)</a></li>
 515
 516 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
 517
 518 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
 519
 520 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
 521
 522 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
 523
 524 </ul></li>
 525
 526 <li>2008
 527 <ul>
 528
 529 <li><a href="https://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 530
 531 <li><a href="https://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 532
 533 </ul></li>
 534
 535 </ul>
 536
 537
 538
 539 <h2>Tags</h2>
 540 <ul>
 541
 542  <li><a href="https://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (19)</a></li>
 543
 544  <li><a href="https://people.skolelinux.org/pere/blog/tags/amiga">amiga (1)</a></li>
 545
 546  <li><a href="https://people.skolelinux.org/pere/blog/tags/aros">aros (1)</a></li>
 547
 548  <li><a href="https://people.skolelinux.org/pere/blog/tags/bankid">bankid (4)</a></li>
 549
 550  <li><a href="https://people.skolelinux.org/pere/blog/tags/betalkontant">betalkontant (9)</a></li>
 551
 552  <li><a href="https://people.skolelinux.org/pere/blog/tags/bitcoin">bitcoin (13)</a></li>
 553
 554  <li><a href="https://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem (17)</a></li>
 555
 556  <li><a href="https://people.skolelinux.org/pere/blog/tags/bsa">bsa (2)</a></li>
 557
 558  <li><a href="https://people.skolelinux.org/pere/blog/tags/chrpath">chrpath (3)</a></li>
 559
 560  <li><a href="https://people.skolelinux.org/pere/blog/tags/debian">debian (200)</a></li>
 561
 562  <li><a href="https://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (159)</a></li>
 563
 564  <li><a href="https://people.skolelinux.org/pere/blog/tags/debian-handbook">debian-handbook (9)</a></li>
 565
 566  <li><a href="https://people.skolelinux.org/pere/blog/tags/digistan">digistan (11)</a></li>
 567
 568  <li><a href="https://people.skolelinux.org/pere/blog/tags/dld">dld (18)</a></li>
 569
 570  <li><a href="https://people.skolelinux.org/pere/blog/tags/docbook">docbook (33)</a></li>
 571
 572  <li><a href="https://people.skolelinux.org/pere/blog/tags/drivstoffpriser">drivstoffpriser (4)</a></li>
 573
 574  <li><a href="https://people.skolelinux.org/pere/blog/tags/english">english (462)</a></li>
 575
 576  <li><a href="https://people.skolelinux.org/pere/blog/tags/fiksgatami">fiksgatami (23)</a></li>
 577
 578  <li><a href="https://people.skolelinux.org/pere/blog/tags/fildeling">fildeling (14)</a></li>
 579
 580  <li><a href="https://people.skolelinux.org/pere/blog/tags/freeculture">freeculture (34)</a></li>
 581
 582  <li><a href="https://people.skolelinux.org/pere/blog/tags/freedombox">freedombox (9)</a></li>
 583
 584  <li><a href="https://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen (20)</a></li>
 585
 586  <li><a href="https://people.skolelinux.org/pere/blog/tags/h264">h264 (20)</a></li>
 587
 588  <li><a href="https://people.skolelinux.org/pere/blog/tags/intervju">intervju (43)</a></li>
 589
 590  <li><a href="https://people.skolelinux.org/pere/blog/tags/isenkram">isenkram (18)</a></li>
 591
 592  <li><a href="https://people.skolelinux.org/pere/blog/tags/kart">kart (23)</a></li>
 593
 594  <li><a href="https://people.skolelinux.org/pere/blog/tags/kodi">kodi (6)</a></li>
 595
 596  <li><a href="https://people.skolelinux.org/pere/blog/tags/ldap">ldap (9)</a></li>
 597
 598  <li><a href="https://people.skolelinux.org/pere/blog/tags/lego">lego (5)</a></li>
 599
 600  <li><a href="https://people.skolelinux.org/pere/blog/tags/lenker">lenker (8)</a></li>
 601
 602  <li><a href="https://people.skolelinux.org/pere/blog/tags/linuxcnc">linuxcnc (6)</a></li>
 603
 604  <li><a href="https://people.skolelinux.org/pere/blog/tags/lsdvd">lsdvd (2)</a></li>
 605
 606  <li><a href="https://people.skolelinux.org/pere/blog/tags/ltsp">ltsp (1)</a></li>
 607
 608  <li><a href="https://people.skolelinux.org/pere/blog/tags/madewithcc">madewithcc (3)</a></li>
 609
 610  <li><a href="https://people.skolelinux.org/pere/blog/tags/mesh network">mesh network (8)</a></li>
 611
 612  <li><a href="https://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (46)</a></li>
 613
 614  <li><a href="https://people.skolelinux.org/pere/blog/tags/nice free software">nice free software (15)</a></li>
 615
 616  <li><a href="https://people.skolelinux.org/pere/blog/tags/noark5">noark5 (25)</a></li>
 617
 618  <li><a href="https://people.skolelinux.org/pere/blog/tags/norsk">norsk (325)</a></li>
 619
 620  <li><a href="https://people.skolelinux.org/pere/blog/tags/nuug">nuug (199)</a></li>
 621
 622  <li><a href="https://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn (41)</a></li>
 623
 624  <li><a href="https://people.skolelinux.org/pere/blog/tags/open311">open311 (2)</a></li>
 625
 626  <li><a href="https://people.skolelinux.org/pere/blog/tags/opensnitch">opensnitch (4)</a></li>
 627
 628  <li><a href="https://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (76)</a></li>
 629
 630  <li><a href="https://people.skolelinux.org/pere/blog/tags/personvern">personvern (114)</a></li>
 631
 632  <li><a href="https://people.skolelinux.org/pere/blog/tags/raid">raid (4)</a></li>
 633
 634  <li><a href="https://people.skolelinux.org/pere/blog/tags/reactos">reactos (1)</a></li>
 635
 636  <li><a href="https://people.skolelinux.org/pere/blog/tags/reprap">reprap (11)</a></li>
 637
 638  <li><a href="https://people.skolelinux.org/pere/blog/tags/rfid">rfid (3)</a></li>
 639
 640  <li><a href="https://people.skolelinux.org/pere/blog/tags/robot">robot (17)</a></li>
 641
 642  <li><a href="https://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
 643
 644  <li><a href="https://people.skolelinux.org/pere/blog/tags/ruter">ruter (7)</a></li>
 645
 646  <li><a href="https://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (2)</a></li>
 647
 648  <li><a href="https://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (60)</a></li>
 649
 650  <li><a href="https://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (4)</a></li>
 651
 652  <li><a href="https://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (5)</a></li>
 653
 654  <li><a href="https://people.skolelinux.org/pere/blog/tags/standard">standard (76)</a></li>
 655
 656  <li><a href="https://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (7)</a></li>
 657
 658  <li><a href="https://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (14)</a></li>
 659
 660  <li><a href="https://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (65)</a></li>
 661
 662  <li><a href="https://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (5)</a></li>
 663
 664  <li><a href="https://people.skolelinux.org/pere/blog/tags/usenix">usenix (2)</a></li>
 665
 666  <li><a href="https://people.skolelinux.org/pere/blog/tags/valg">valg (9)</a></li>
 667
 668  <li><a href="https://people.skolelinux.org/pere/blog/tags/verkidetfri">verkidetfri (22)</a></li>
 669
 670  <li><a href="https://people.skolelinux.org/pere/blog/tags/video">video (80)</a></li>
 671
 672  <li><a href="https://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
 673
 674  <li><a href="https://people.skolelinux.org/pere/blog/tags/web">web (42)</a></li>
 675
 676 </ul>
 677
 678
 679     </div>
 680     <p style="text-align: right">
 681  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 682 </p>
 683
 684   </body>
 685 </html>