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://www.hungry.com/~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://www.hungry.com/~pere/blog/tags/debian">debian</a>, <a href="http://www.hungry.com/~pere/blog/tags/english">english</a>.</div>
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 103 <h2>Archive</h2>
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 240 </ul></li>
 241
 242 <li>2018
 243 <ul>
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 266
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 268
 269 <li>2017
 270 <ul>
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 272 <li><a href="http://www.hungry.com/~pere/blog/archive/2017/01/">January (4)</a></li>
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 289
 290 <li><a href="http://www.hungry.com/~pere/blog/archive/2017/11/">November (3)</a></li>
 291
 292 <li><a href="http://www.hungry.com/~pere/blog/archive/2017/12/">December (4)</a></li>
 293
 294 </ul></li>
 295
 296 <li>2016
 297 <ul>
 298
 299 <li><a href="http://www.hungry.com/~pere/blog/archive/2016/01/">January (3)</a></li>
 300
 301 <li><a href="http://www.hungry.com/~pere/blog/archive/2016/02/">February (2)</a></li>
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 306
 307 <li><a href="http://www.hungry.com/~pere/blog/archive/2016/05/">May (8)</a></li>
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 312
 313 <li><a href="http://www.hungry.com/~pere/blog/archive/2016/08/">August (5)</a></li>
 314
 315 <li><a href="http://www.hungry.com/~pere/blog/archive/2016/09/">September (2)</a></li>
 316
 317 <li><a href="http://www.hungry.com/~pere/blog/archive/2016/10/">October (3)</a></li>
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 319 <li><a href="http://www.hungry.com/~pere/blog/archive/2016/11/">November (8)</a></li>
 320
 321 <li><a href="http://www.hungry.com/~pere/blog/archive/2016/12/">December (5)</a></li>
 322
 323 </ul></li>
 324
 325 <li>2015
 326 <ul>
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 328 <li><a href="http://www.hungry.com/~pere/blog/archive/2015/01/">January (7)</a></li>
 329
 330 <li><a href="http://www.hungry.com/~pere/blog/archive/2015/02/">February (6)</a></li>
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 333
 334 <li><a href="http://www.hungry.com/~pere/blog/archive/2015/04/">April (4)</a></li>
 335
 336 <li><a href="http://www.hungry.com/~pere/blog/archive/2015/05/">May (3)</a></li>
 337
 338 <li><a href="http://www.hungry.com/~pere/blog/archive/2015/06/">June (4)</a></li>
 339
 340 <li><a href="http://www.hungry.com/~pere/blog/archive/2015/07/">July (6)</a></li>
 341
 342 <li><a href="http://www.hungry.com/~pere/blog/archive/2015/08/">August (2)</a></li>
 343
 344 <li><a href="http://www.hungry.com/~pere/blog/archive/2015/09/">September (2)</a></li>
 345
 346 <li><a href="http://www.hungry.com/~pere/blog/archive/2015/10/">October (9)</a></li>
 347
 348 <li><a href="http://www.hungry.com/~pere/blog/archive/2015/11/">November (6)</a></li>
 349
 350 <li><a href="http://www.hungry.com/~pere/blog/archive/2015/12/">December (3)</a></li>
 351
 352 </ul></li>
 353
 354 <li>2014
 355 <ul>
 356
 357 <li><a href="http://www.hungry.com/~pere/blog/archive/2014/01/">January (2)</a></li>
 358
 359 <li><a href="http://www.hungry.com/~pere/blog/archive/2014/02/">February (3)</a></li>
 360
 361 <li><a href="http://www.hungry.com/~pere/blog/archive/2014/03/">March (8)</a></li>
 362
 363 <li><a href="http://www.hungry.com/~pere/blog/archive/2014/04/">April (7)</a></li>
 364
 365 <li><a href="http://www.hungry.com/~pere/blog/archive/2014/05/">May (1)</a></li>
 366
 367 <li><a href="http://www.hungry.com/~pere/blog/archive/2014/06/">June (2)</a></li>
 368
 369 <li><a href="http://www.hungry.com/~pere/blog/archive/2014/07/">July (2)</a></li>
 370
 371 <li><a href="http://www.hungry.com/~pere/blog/archive/2014/08/">August (2)</a></li>
 372
 373 <li><a href="http://www.hungry.com/~pere/blog/archive/2014/09/">September (5)</a></li>
 374
 375 <li><a href="http://www.hungry.com/~pere/blog/archive/2014/10/">October (6)</a></li>
 376
 377 <li><a href="http://www.hungry.com/~pere/blog/archive/2014/11/">November (3)</a></li>
 378
 379 <li><a href="http://www.hungry.com/~pere/blog/archive/2014/12/">December (5)</a></li>
 380
 381 </ul></li>
 382
 383 <li>2013
 384 <ul>
 385
 386 <li><a href="http://www.hungry.com/~pere/blog/archive/2013/01/">January (11)</a></li>
 387
 388 <li><a href="http://www.hungry.com/~pere/blog/archive/2013/02/">February (9)</a></li>
 389
 390 <li><a href="http://www.hungry.com/~pere/blog/archive/2013/03/">March (9)</a></li>
 391
 392 <li><a href="http://www.hungry.com/~pere/blog/archive/2013/04/">April (6)</a></li>
 393
 394 <li><a href="http://www.hungry.com/~pere/blog/archive/2013/05/">May (9)</a></li>
 395
 396 <li><a href="http://www.hungry.com/~pere/blog/archive/2013/06/">June (10)</a></li>
 397
 398 <li><a href="http://www.hungry.com/~pere/blog/archive/2013/07/">July (7)</a></li>
 399
 400 <li><a href="http://www.hungry.com/~pere/blog/archive/2013/08/">August (3)</a></li>
 401
 402 <li><a href="http://www.hungry.com/~pere/blog/archive/2013/09/">September (5)</a></li>
 403
 404 <li><a href="http://www.hungry.com/~pere/blog/archive/2013/10/">October (7)</a></li>
 405
 406 <li><a href="http://www.hungry.com/~pere/blog/archive/2013/11/">November (9)</a></li>
 407
 408 <li><a href="http://www.hungry.com/~pere/blog/archive/2013/12/">December (3)</a></li>
 409
 410 </ul></li>
 411
 412 <li>2012
 413 <ul>
 414
 415 <li><a href="http://www.hungry.com/~pere/blog/archive/2012/01/">January (7)</a></li>
 416
 417 <li><a href="http://www.hungry.com/~pere/blog/archive/2012/02/">February (10)</a></li>
 418
 419 <li><a href="http://www.hungry.com/~pere/blog/archive/2012/03/">March (17)</a></li>
 420
 421 <li><a href="http://www.hungry.com/~pere/blog/archive/2012/04/">April (12)</a></li>
 422
 423 <li><a href="http://www.hungry.com/~pere/blog/archive/2012/05/">May (12)</a></li>
 424
 425 <li><a href="http://www.hungry.com/~pere/blog/archive/2012/06/">June (20)</a></li>
 426
 427 <li><a href="http://www.hungry.com/~pere/blog/archive/2012/07/">July (17)</a></li>
 428
 429 <li><a href="http://www.hungry.com/~pere/blog/archive/2012/08/">August (6)</a></li>
 430
 431 <li><a href="http://www.hungry.com/~pere/blog/archive/2012/09/">September (9)</a></li>
 432
 433 <li><a href="http://www.hungry.com/~pere/blog/archive/2012/10/">October (17)</a></li>
 434
 435 <li><a href="http://www.hungry.com/~pere/blog/archive/2012/11/">November (10)</a></li>
 436
 437 <li><a href="http://www.hungry.com/~pere/blog/archive/2012/12/">December (7)</a></li>
 438
 439 </ul></li>
 440
 441 <li>2011
 442 <ul>
 443
 444 <li><a href="http://www.hungry.com/~pere/blog/archive/2011/01/">January (16)</a></li>
 445
 446 <li><a href="http://www.hungry.com/~pere/blog/archive/2011/02/">February (6)</a></li>
 447
 448 <li><a href="http://www.hungry.com/~pere/blog/archive/2011/03/">March (6)</a></li>
 449
 450 <li><a href="http://www.hungry.com/~pere/blog/archive/2011/04/">April (7)</a></li>
 451
 452 <li><a href="http://www.hungry.com/~pere/blog/archive/2011/05/">May (3)</a></li>
 453
 454 <li><a href="http://www.hungry.com/~pere/blog/archive/2011/06/">June (2)</a></li>
 455
 456 <li><a href="http://www.hungry.com/~pere/blog/archive/2011/07/">July (7)</a></li>
 457
 458 <li><a href="http://www.hungry.com/~pere/blog/archive/2011/08/">August (6)</a></li>
 459
 460 <li><a href="http://www.hungry.com/~pere/blog/archive/2011/09/">September (4)</a></li>
 461
 462 <li><a href="http://www.hungry.com/~pere/blog/archive/2011/10/">October (2)</a></li>
 463
 464 <li><a href="http://www.hungry.com/~pere/blog/archive/2011/11/">November (3)</a></li>
 465
 466 <li><a href="http://www.hungry.com/~pere/blog/archive/2011/12/">December (1)</a></li>
 467
 468 </ul></li>
 469
 470 <li>2010
 471 <ul>
 472
 473 <li><a href="http://www.hungry.com/~pere/blog/archive/2010/01/">January (2)</a></li>
 474
 475 <li><a href="http://www.hungry.com/~pere/blog/archive/2010/02/">February (1)</a></li>
 476
 477 <li><a href="http://www.hungry.com/~pere/blog/archive/2010/03/">March (3)</a></li>
 478
 479 <li><a href="http://www.hungry.com/~pere/blog/archive/2010/04/">April (3)</a></li>
 480
 481 <li><a href="http://www.hungry.com/~pere/blog/archive/2010/05/">May (9)</a></li>
 482
 483 <li><a href="http://www.hungry.com/~pere/blog/archive/2010/06/">June (14)</a></li>
 484
 485 <li><a href="http://www.hungry.com/~pere/blog/archive/2010/07/">July (12)</a></li>
 486
 487 <li><a href="http://www.hungry.com/~pere/blog/archive/2010/08/">August (13)</a></li>
 488
 489 <li><a href="http://www.hungry.com/~pere/blog/archive/2010/09/">September (7)</a></li>
 490
 491 <li><a href="http://www.hungry.com/~pere/blog/archive/2010/10/">October (9)</a></li>
 492
 493 <li><a href="http://www.hungry.com/~pere/blog/archive/2010/11/">November (13)</a></li>
 494
 495 <li><a href="http://www.hungry.com/~pere/blog/archive/2010/12/">December (12)</a></li>
 496
 497 </ul></li>
 498
 499 <li>2009
 500 <ul>
 501
 502 <li><a href="http://www.hungry.com/~pere/blog/archive/2009/01/">January (8)</a></li>
 503
 504 <li><a href="http://www.hungry.com/~pere/blog/archive/2009/02/">February (8)</a></li>
 505
 506 <li><a href="http://www.hungry.com/~pere/blog/archive/2009/03/">March (12)</a></li>
 507
 508 <li><a href="http://www.hungry.com/~pere/blog/archive/2009/04/">April (10)</a></li>
 509
 510 <li><a href="http://www.hungry.com/~pere/blog/archive/2009/05/">May (9)</a></li>
 511
 512 <li><a href="http://www.hungry.com/~pere/blog/archive/2009/06/">June (3)</a></li>
 513
 514 <li><a href="http://www.hungry.com/~pere/blog/archive/2009/07/">July (4)</a></li>
 515
 516 <li><a href="http://www.hungry.com/~pere/blog/archive/2009/08/">August (3)</a></li>
 517
 518 <li><a href="http://www.hungry.com/~pere/blog/archive/2009/09/">September (1)</a></li>
 519
 520 <li><a href="http://www.hungry.com/~pere/blog/archive/2009/10/">October (2)</a></li>
 521
 522 <li><a href="http://www.hungry.com/~pere/blog/archive/2009/11/">November (3)</a></li>
 523
 524 <li><a href="http://www.hungry.com/~pere/blog/archive/2009/12/">December (3)</a></li>
 525
 526 </ul></li>
 527
 528 <li>2008
 529 <ul>
 530
 531 <li><a href="http://www.hungry.com/~pere/blog/archive/2008/11/">November (5)</a></li>
 532
 533 <li><a href="http://www.hungry.com/~pere/blog/archive/2008/12/">December (7)</a></li>
 534
 535 </ul></li>
 536
 537 </ul>
 538
 539
 540
 541 <h2>Tags</h2>
 542 <ul>
 543
 544  <li><a href="http://www.hungry.com/~pere/blog/tags/3d-printer">3d-printer (19)</a></li>
 545
 546  <li><a href="http://www.hungry.com/~pere/blog/tags/amiga">amiga (1)</a></li>
 547
 548  <li><a href="http://www.hungry.com/~pere/blog/tags/aros">aros (1)</a></li>
 549
 550  <li><a href="http://www.hungry.com/~pere/blog/tags/bankid">bankid (4)</a></li>
 551
 552  <li><a href="http://www.hungry.com/~pere/blog/tags/betalkontant">betalkontant (9)</a></li>
 553
 554  <li><a href="http://www.hungry.com/~pere/blog/tags/bitcoin">bitcoin (13)</a></li>
 555
 556  <li><a href="http://www.hungry.com/~pere/blog/tags/bootsystem">bootsystem (17)</a></li>
 557
 558  <li><a href="http://www.hungry.com/~pere/blog/tags/bsa">bsa (2)</a></li>
 559
 560  <li><a href="http://www.hungry.com/~pere/blog/tags/chrpath">chrpath (3)</a></li>
 561
 562  <li><a href="http://www.hungry.com/~pere/blog/tags/debian">debian (202)</a></li>
 563
 564  <li><a href="http://www.hungry.com/~pere/blog/tags/debian edu">debian edu (159)</a></li>
 565
 566  <li><a href="http://www.hungry.com/~pere/blog/tags/debian-handbook">debian-handbook (9)</a></li>
 567
 568  <li><a href="http://www.hungry.com/~pere/blog/tags/digistan">digistan (11)</a></li>
 569
 570  <li><a href="http://www.hungry.com/~pere/blog/tags/dld">dld (18)</a></li>
 571
 572  <li><a href="http://www.hungry.com/~pere/blog/tags/docbook">docbook (33)</a></li>
 573
 574  <li><a href="http://www.hungry.com/~pere/blog/tags/drivstoffpriser">drivstoffpriser (4)</a></li>
 575
 576  <li><a href="http://www.hungry.com/~pere/blog/tags/english">english (464)</a></li>
 577
 578  <li><a href="http://www.hungry.com/~pere/blog/tags/fiksgatami">fiksgatami (23)</a></li>
 579
 580  <li><a href="http://www.hungry.com/~pere/blog/tags/fildeling">fildeling (14)</a></li>
 581
 582  <li><a href="http://www.hungry.com/~pere/blog/tags/freeculture">freeculture (34)</a></li>
 583
 584  <li><a href="http://www.hungry.com/~pere/blog/tags/freedombox">freedombox (9)</a></li>
 585
 586  <li><a href="http://www.hungry.com/~pere/blog/tags/frikanalen">frikanalen (20)</a></li>
 587
 588  <li><a href="http://www.hungry.com/~pere/blog/tags/h264">h264 (20)</a></li>
 589
 590  <li><a href="http://www.hungry.com/~pere/blog/tags/intervju">intervju (43)</a></li>
 591
 592  <li><a href="http://www.hungry.com/~pere/blog/tags/isenkram">isenkram (18)</a></li>
 593
 594  <li><a href="http://www.hungry.com/~pere/blog/tags/kart">kart (23)</a></li>
 595
 596  <li><a href="http://www.hungry.com/~pere/blog/tags/kodi">kodi (6)</a></li>
 597
 598  <li><a href="http://www.hungry.com/~pere/blog/tags/ldap">ldap (9)</a></li>
 599
 600  <li><a href="http://www.hungry.com/~pere/blog/tags/lego">lego (5)</a></li>
 601
 602  <li><a href="http://www.hungry.com/~pere/blog/tags/lenker">lenker (8)</a></li>
 603
 604  <li><a href="http://www.hungry.com/~pere/blog/tags/linuxcnc">linuxcnc (7)</a></li>
 605
 606  <li><a href="http://www.hungry.com/~pere/blog/tags/lsdvd">lsdvd (2)</a></li>
 607
 608  <li><a href="http://www.hungry.com/~pere/blog/tags/ltsp">ltsp (1)</a></li>
 609
 610  <li><a href="http://www.hungry.com/~pere/blog/tags/madewithcc">madewithcc (3)</a></li>
 611
 612  <li><a href="http://www.hungry.com/~pere/blog/tags/mesh network">mesh network (8)</a></li>
 613
 614  <li><a href="http://www.hungry.com/~pere/blog/tags/multimedia">multimedia (46)</a></li>
 615
 616  <li><a href="http://www.hungry.com/~pere/blog/tags/nice free software">nice free software (15)</a></li>
 617
 618  <li><a href="http://www.hungry.com/~pere/blog/tags/noark5">noark5 (25)</a></li>
 619
 620  <li><a href="http://www.hungry.com/~pere/blog/tags/norsk">norsk (325)</a></li>
 621
 622  <li><a href="http://www.hungry.com/~pere/blog/tags/nuug">nuug (199)</a></li>
 623
 624  <li><a href="http://www.hungry.com/~pere/blog/tags/offentlig innsyn">offentlig innsyn (41)</a></li>
 625
 626  <li><a href="http://www.hungry.com/~pere/blog/tags/open311">open311 (2)</a></li>
 627
 628  <li><a href="http://www.hungry.com/~pere/blog/tags/opensnitch">opensnitch (4)</a></li>
 629
 630  <li><a href="http://www.hungry.com/~pere/blog/tags/opphavsrett">opphavsrett (76)</a></li>
 631
 632  <li><a href="http://www.hungry.com/~pere/blog/tags/personvern">personvern (114)</a></li>
 633
 634  <li><a href="http://www.hungry.com/~pere/blog/tags/raid">raid (4)</a></li>
 635
 636  <li><a href="http://www.hungry.com/~pere/blog/tags/reactos">reactos (1)</a></li>
 637
 638  <li><a href="http://www.hungry.com/~pere/blog/tags/reprap">reprap (11)</a></li>
 639
 640  <li><a href="http://www.hungry.com/~pere/blog/tags/rfid">rfid (3)</a></li>
 641
 642  <li><a href="http://www.hungry.com/~pere/blog/tags/robot">robot (17)</a></li>
 643
 644  <li><a href="http://www.hungry.com/~pere/blog/tags/rss">rss (1)</a></li>
 645
 646  <li><a href="http://www.hungry.com/~pere/blog/tags/ruter">ruter (7)</a></li>
 647
 648  <li><a href="http://www.hungry.com/~pere/blog/tags/scraperwiki">scraperwiki (2)</a></li>
 649
 650  <li><a href="http://www.hungry.com/~pere/blog/tags/sikkerhet">sikkerhet (60)</a></li>
 651
 652  <li><a href="http://www.hungry.com/~pere/blog/tags/sitesummary">sitesummary (4)</a></li>
 653
 654  <li><a href="http://www.hungry.com/~pere/blog/tags/skepsis">skepsis (5)</a></li>
 655
 656  <li><a href="http://www.hungry.com/~pere/blog/tags/standard">standard (76)</a></li>
 657
 658  <li><a href="http://www.hungry.com/~pere/blog/tags/stavekontroll">stavekontroll (7)</a></li>
 659
 660  <li><a href="http://www.hungry.com/~pere/blog/tags/stortinget">stortinget (14)</a></li>
 661
 662  <li><a href="http://www.hungry.com/~pere/blog/tags/surveillance">surveillance (65)</a></li>
 663
 664  <li><a href="http://www.hungry.com/~pere/blog/tags/sysadmin">sysadmin (5)</a></li>
 665
 666  <li><a href="http://www.hungry.com/~pere/blog/tags/usenix">usenix (2)</a></li>
 667
 668  <li><a href="http://www.hungry.com/~pere/blog/tags/valg">valg (9)</a></li>
 669
 670  <li><a href="http://www.hungry.com/~pere/blog/tags/verkidetfri">verkidetfri (22)</a></li>
 671
 672  <li><a href="http://www.hungry.com/~pere/blog/tags/video">video (80)</a></li>
 673
 674  <li><a href="http://www.hungry.com/~pere/blog/tags/vitenskap">vitenskap (4)</a></li>
 675
 676  <li><a href="http://www.hungry.com/~pere/blog/tags/web">web (42)</a></li>
 677
 678 </ul>
 679
 680
 681     </div>
 682     <p style="text-align: right">
 683  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 684 </p>
 685
 686   </body>
 687 </html>