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>
  92
  93
  94     </div>
  95
  96
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  99     <div id="sidebar">
 100
 101
 102
 103 <h2>Archive</h2>
 104 <ul>
 105
 106 <li>2022
 107 <ul>
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 139
 140 <li>2020
 141 <ul>
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 162
 163 <li>2019
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 187
 188 <li>2018
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 210
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 212
 213 </ul></li>
 214
 215 <li>2017
 216 <ul>
 217
 218 <li><a href="https://people.skolelinux.org/pere/blog/archive/2017/01/">January (4)</a></li>
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 227
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 229
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 233
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 235
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 237
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 239
 240 </ul></li>
 241
 242 <li>2016
 243 <ul>
 244
 245 <li><a href="https://people.skolelinux.org/pere/blog/archive/2016/01/">January (3)</a></li>
 246
 247 <li><a href="https://people.skolelinux.org/pere/blog/archive/2016/02/">February (2)</a></li>
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 264
 265 <li><a href="https://people.skolelinux.org/pere/blog/archive/2016/11/">November (8)</a></li>
 266
 267 <li><a href="https://people.skolelinux.org/pere/blog/archive/2016/12/">December (5)</a></li>
 268
 269 </ul></li>
 270
 271 <li>2015
 272 <ul>
 273
 274 <li><a href="https://people.skolelinux.org/pere/blog/archive/2015/01/">January (7)</a></li>
 275
 276 <li><a href="https://people.skolelinux.org/pere/blog/archive/2015/02/">February (6)</a></li>
 277
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 279
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 281
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 283
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 285
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 287
 288 <li><a href="https://people.skolelinux.org/pere/blog/archive/2015/08/">August (2)</a></li>
 289
 290 <li><a href="https://people.skolelinux.org/pere/blog/archive/2015/09/">September (2)</a></li>
 291
 292 <li><a href="https://people.skolelinux.org/pere/blog/archive/2015/10/">October (9)</a></li>
 293
 294 <li><a href="https://people.skolelinux.org/pere/blog/archive/2015/11/">November (6)</a></li>
 295
 296 <li><a href="https://people.skolelinux.org/pere/blog/archive/2015/12/">December (3)</a></li>
 297
 298 </ul></li>
 299
 300 <li>2014
 301 <ul>
 302
 303 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/01/">January (2)</a></li>
 304
 305 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/02/">February (3)</a></li>
 306
 307 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/03/">March (8)</a></li>
 308
 309 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/04/">April (7)</a></li>
 310
 311 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/05/">May (1)</a></li>
 312
 313 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/06/">June (2)</a></li>
 314
 315 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/07/">July (2)</a></li>
 316
 317 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/08/">August (2)</a></li>
 318
 319 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/09/">September (5)</a></li>
 320
 321 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/10/">October (6)</a></li>
 322
 323 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/11/">November (3)</a></li>
 324
 325 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/12/">December (5)</a></li>
 326
 327 </ul></li>
 328
 329 <li>2013
 330 <ul>
 331
 332 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/01/">January (11)</a></li>
 333
 334 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/02/">February (9)</a></li>
 335
 336 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/03/">March (9)</a></li>
 337
 338 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/04/">April (6)</a></li>
 339
 340 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/05/">May (9)</a></li>
 341
 342 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/06/">June (10)</a></li>
 343
 344 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/07/">July (7)</a></li>
 345
 346 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/08/">August (3)</a></li>
 347
 348 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/09/">September (5)</a></li>
 349
 350 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/10/">October (7)</a></li>
 351
 352 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/11/">November (9)</a></li>
 353
 354 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/12/">December (3)</a></li>
 355
 356 </ul></li>
 357
 358 <li>2012
 359 <ul>
 360
 361 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/01/">January (7)</a></li>
 362
 363 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/02/">February (10)</a></li>
 364
 365 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/03/">March (17)</a></li>
 366
 367 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/04/">April (12)</a></li>
 368
 369 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/05/">May (12)</a></li>
 370
 371 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/06/">June (20)</a></li>
 372
 373 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/07/">July (17)</a></li>
 374
 375 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/08/">August (6)</a></li>
 376
 377 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/09/">September (9)</a></li>
 378
 379 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/10/">October (17)</a></li>
 380
 381 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/11/">November (10)</a></li>
 382
 383 <li><a href="https://people.skolelinux.org/pere/blog/archive/2012/12/">December (7)</a></li>
 384
 385 </ul></li>
 386
 387 <li>2011
 388 <ul>
 389
 390 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/01/">January (16)</a></li>
 391
 392 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/02/">February (6)</a></li>
 393
 394 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/03/">March (6)</a></li>
 395
 396 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/04/">April (7)</a></li>
 397
 398 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/05/">May (3)</a></li>
 399
 400 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/06/">June (2)</a></li>
 401
 402 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/07/">July (7)</a></li>
 403
 404 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/08/">August (6)</a></li>
 405
 406 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/09/">September (4)</a></li>
 407
 408 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/10/">October (2)</a></li>
 409
 410 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/11/">November (3)</a></li>
 411
 412 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/12/">December (1)</a></li>
 413
 414 </ul></li>
 415
 416 <li>2010
 417 <ul>
 418
 419 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
 420
 421 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
 422
 423 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/03/">March (3)</a></li>
 424
 425 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/04/">April (3)</a></li>
 426
 427 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/05/">May (9)</a></li>
 428
 429 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/06/">June (14)</a></li>
 430
 431 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/07/">July (12)</a></li>
 432
 433 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/08/">August (13)</a></li>
 434
 435 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/09/">September (7)</a></li>
 436
 437 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/10/">October (9)</a></li>
 438
 439 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/11/">November (13)</a></li>
 440
 441 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
 442
 443 </ul></li>
 444
 445 <li>2009
 446 <ul>
 447
 448 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
 449
 450 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
 451
 452 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/03/">March (12)</a></li>
 453
 454 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/04/">April (10)</a></li>
 455
 456 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/05/">May (9)</a></li>
 457
 458 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/06/">June (3)</a></li>
 459
 460 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/07/">July (4)</a></li>
 461
 462 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/08/">August (3)</a></li>
 463
 464 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
 465
 466 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
 467
 468 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
 469
 470 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
 471
 472 </ul></li>
 473
 474 <li>2008
 475 <ul>
 476
 477 <li><a href="https://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 478
 479 <li><a href="https://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 480
 481 </ul></li>
 482
 483 </ul>
 484
 485
 486
 487 <h2>Tags</h2>
 488 <ul>
 489
 490  <li><a href="https://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (17)</a></li>
 491
 492  <li><a href="https://people.skolelinux.org/pere/blog/tags/amiga">amiga (1)</a></li>
 493
 494  <li><a href="https://people.skolelinux.org/pere/blog/tags/aros">aros (1)</a></li>
 495
 496  <li><a href="https://people.skolelinux.org/pere/blog/tags/bankid">bankid (4)</a></li>
 497
 498  <li><a href="https://people.skolelinux.org/pere/blog/tags/betalkontant">betalkontant (9)</a></li>
 499
 500  <li><a href="https://people.skolelinux.org/pere/blog/tags/bitcoin">bitcoin (12)</a></li>
 501
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 619
 620 </ul>
 621
 622
 623     </div>
 624     <p style="text-align: right">
 625  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 626 </p>
 627
 628   </body>
 629 </html>