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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 237
 238 <li>2017
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 291
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 293
 294 <li>2015
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 297 <li><a href="https://people.skolelinux.org/pere/blog/archive/2015/01/">January (7)</a></li>
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 320
 321 </ul></li>
 322
 323 <li>2014
 324 <ul>
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 326 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/01/">January (2)</a></li>
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 347
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 349
 350 </ul></li>
 351
 352 <li>2013
 353 <ul>
 354
 355 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/01/">January (11)</a></li>
 356
 357 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/02/">February (9)</a></li>
 358
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 361 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/04/">April (6)</a></li>
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 376
 377 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/12/">December (3)</a></li>
 378
 379 </ul></li>
 380
 381 <li>2012
 382 <ul>
 383
 384 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/01/">January (7)</a></li>
 385
 386 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/02/">February (10)</a></li>
 387
 388 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/03/">March (17)</a></li>
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 406 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/12/">December (7)</a></li>
 407
 408 </ul></li>
 409
 410 <li>2011
 411 <ul>
 412
 413 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/01/">January (16)</a></li>
 414
 415 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/02/">February (6)</a></li>
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 431 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/10/">October (2)</a></li>
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 434
 435 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/12/">December (1)</a></li>
 436
 437 </ul></li>
 438
 439 <li>2010
 440 <ul>
 441
 442 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
 443
 444 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
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 446 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/03/">March (3)</a></li>
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 450 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/05/">May (9)</a></li>
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 452 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/06/">June (14)</a></li>
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 459
 460 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/10/">October (9)</a></li>
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 463
 464 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
 465
 466 </ul></li>
 467
 468 <li>2009
 469 <ul>
 470
 471 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
 472
 473 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
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 495 </ul></li>
 496
 497 <li>2008
 498 <ul>
 499
 500 <li><a href="https://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 501
 502 <li><a href="https://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 503
 504 </ul></li>
 505
 506 </ul>
 507
 508
 509
 510 <h2>Tags</h2>
 511 <ul>
 512
 513  <li><a href="https://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (19)</a></li>
 514
 515  <li><a href="https://people.skolelinux.org/pere/blog/tags/amiga">amiga (1)</a></li>
 516
 517  <li><a href="https://people.skolelinux.org/pere/blog/tags/aros">aros (1)</a></li>
 518
 519  <li><a href="https://people.skolelinux.org/pere/blog/tags/bankid">bankid (4)</a></li>
 520
 521  <li><a href="https://people.skolelinux.org/pere/blog/tags/betalkontant">betalkontant (9)</a></li>
 522
 523  <li><a href="https://people.skolelinux.org/pere/blog/tags/bitcoin">bitcoin (12)</a></li>
 524
 525  <li><a href="https://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem (17)</a></li>
 526
 527  <li><a href="https://people.skolelinux.org/pere/blog/tags/bsa">bsa (2)</a></li>
 528
 529  <li><a href="https://people.skolelinux.org/pere/blog/tags/chrpath">chrpath (2)</a></li>
 530
 531  <li><a href="https://people.skolelinux.org/pere/blog/tags/debian">debian (193)</a></li>
 532
 533  <li><a href="https://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (159)</a></li>
 534
 535  <li><a href="https://people.skolelinux.org/pere/blog/tags/debian-handbook">debian-handbook (9)</a></li>
 536
 537  <li><a href="https://people.skolelinux.org/pere/blog/tags/digistan">digistan (11)</a></li>
 538
 539  <li><a href="https://people.skolelinux.org/pere/blog/tags/dld">dld (18)</a></li>
 540
 541  <li><a href="https://people.skolelinux.org/pere/blog/tags/docbook">docbook (30)</a></li>
 542
 543  <li><a href="https://people.skolelinux.org/pere/blog/tags/drivstoffpriser">drivstoffpriser (4)</a></li>
 544
 545  <li><a href="https://people.skolelinux.org/pere/blog/tags/english">english (449)</a></li>
 546
 547  <li><a href="https://people.skolelinux.org/pere/blog/tags/fiksgatami">fiksgatami (23)</a></li>
 548
 549  <li><a href="https://people.skolelinux.org/pere/blog/tags/fildeling">fildeling (14)</a></li>
 550
 551  <li><a href="https://people.skolelinux.org/pere/blog/tags/freeculture">freeculture (34)</a></li>
 552
 553  <li><a href="https://people.skolelinux.org/pere/blog/tags/freedombox">freedombox (9)</a></li>
 554
 555  <li><a href="https://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen (20)</a></li>
 556
 557  <li><a href="https://people.skolelinux.org/pere/blog/tags/h264">h264 (20)</a></li>
 558
 559  <li><a href="https://people.skolelinux.org/pere/blog/tags/intervju">intervju (43)</a></li>
 560
 561  <li><a href="https://people.skolelinux.org/pere/blog/tags/isenkram">isenkram (16)</a></li>
 562
 563  <li><a href="https://people.skolelinux.org/pere/blog/tags/kart">kart (23)</a></li>
 564
 565  <li><a href="https://people.skolelinux.org/pere/blog/tags/kodi">kodi (4)</a></li>
 566
 567  <li><a href="https://people.skolelinux.org/pere/blog/tags/ldap">ldap (9)</a></li>
 568
 569  <li><a href="https://people.skolelinux.org/pere/blog/tags/lego">lego (5)</a></li>
 570
 571  <li><a href="https://people.skolelinux.org/pere/blog/tags/lenker">lenker (8)</a></li>
 572
 573  <li><a href="https://people.skolelinux.org/pere/blog/tags/linuxcnc">linuxcnc (5)</a></li>
 574
 575  <li><a href="https://people.skolelinux.org/pere/blog/tags/lsdvd">lsdvd (2)</a></li>
 576
 577  <li><a href="https://people.skolelinux.org/pere/blog/tags/ltsp">ltsp (1)</a></li>
 578
 579  <li><a href="https://people.skolelinux.org/pere/blog/tags/madewithcc">madewithcc (3)</a></li>
 580
 581  <li><a href="https://people.skolelinux.org/pere/blog/tags/mesh network">mesh network (8)</a></li>
 582
 583  <li><a href="https://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (45)</a></li>
 584
 585  <li><a href="https://people.skolelinux.org/pere/blog/tags/nice free software">nice free software (15)</a></li>
 586
 587  <li><a href="https://people.skolelinux.org/pere/blog/tags/noark5">noark5 (23)</a></li>
 588
 589  <li><a href="https://people.skolelinux.org/pere/blog/tags/norsk">norsk (320)</a></li>
 590
 591  <li><a href="https://people.skolelinux.org/pere/blog/tags/nuug">nuug (198)</a></li>
 592
 593  <li><a href="https://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn (40)</a></li>
 594
 595  <li><a href="https://people.skolelinux.org/pere/blog/tags/open311">open311 (2)</a></li>
 596
 597  <li><a href="https://people.skolelinux.org/pere/blog/tags/opensnitch">opensnitch (3)</a></li>
 598
 599  <li><a href="https://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (75)</a></li>
 600
 601  <li><a href="https://people.skolelinux.org/pere/blog/tags/personvern">personvern (114)</a></li>
 602
 603  <li><a href="https://people.skolelinux.org/pere/blog/tags/raid">raid (2)</a></li>
 604
 605  <li><a href="https://people.skolelinux.org/pere/blog/tags/reactos">reactos (1)</a></li>
 606
 607  <li><a href="https://people.skolelinux.org/pere/blog/tags/reprap">reprap (11)</a></li>
 608
 609  <li><a href="https://people.skolelinux.org/pere/blog/tags/rfid">rfid (3)</a></li>
 610
 611  <li><a href="https://people.skolelinux.org/pere/blog/tags/robot">robot (17)</a></li>
 612
 613  <li><a href="https://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
 614
 615  <li><a href="https://people.skolelinux.org/pere/blog/tags/ruter">ruter (7)</a></li>
 616
 617  <li><a href="https://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (2)</a></li>
 618
 619  <li><a href="https://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (59)</a></li>
 620
 621  <li><a href="https://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (4)</a></li>
 622
 623  <li><a href="https://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (5)</a></li>
 624
 625  <li><a href="https://people.skolelinux.org/pere/blog/tags/standard">standard (74)</a></li>
 626
 627  <li><a href="https://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (7)</a></li>
 628
 629  <li><a href="https://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (14)</a></li>
 630
 631  <li><a href="https://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (64)</a></li>
 632
 633  <li><a href="https://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (5)</a></li>
 634
 635  <li><a href="https://people.skolelinux.org/pere/blog/tags/usenix">usenix (2)</a></li>
 636
 637  <li><a href="https://people.skolelinux.org/pere/blog/tags/valg">valg (9)</a></li>
 638
 639  <li><a href="https://people.skolelinux.org/pere/blog/tags/verkidetfri">verkidetfri (20)</a></li>
 640
 641  <li><a href="https://people.skolelinux.org/pere/blog/tags/video">video (78)</a></li>
 642
 643  <li><a href="https://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
 644
 645  <li><a href="https://people.skolelinux.org/pere/blog/tags/web">web (42)</a></li>
 646
 647 </ul>
 648
 649
 650     </div>
 651     <p style="text-align: right">
 652  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 653 </p>
 654
 655   </body>
 656 </html>