blog/Public_Trusted_Timestamping_services_for_everyone.html

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   6     <title>Petter Reinholdtsen: Public Trusted Timestamping services for everyone</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">Public Trusted Timestamping services for everyone</div>
  24       <div class="date">25th March 2014</div>
  25       <div class="body"><p>Did you ever need to store logs or other files in a way that would
  26 allow it to be used as evidence in court, and needed a way to
  27 demonstrate without reasonable doubt that the file had not been
  28 changed since it was created?  Or, did you ever need to document that
  29 a given document was received at some point in time, like some
  30 archived document or the answer to an exam, and not changed after it
  31 was received?  The problem in these settings is to remove the need to
  32 trust yourself and your computers, while still being able to prove
  33 that a file is the same as it was at some given time in the past.</p>
  34
  35 <p>A solution to these problems is to have a trusted third party
  36 "stamp" the document and verify that at some given time the document
  37 looked a given way.  Such
  38 <a href="https://en.wikipedia.org/wiki/Notarius">notarius</a> service
  39 have been around for thousands of years, and its digital equivalent is
  40 called a
  41 <a href="http://en.wikipedia.org/wiki/Trusted_timestamping">trusted
  42 timestamping service</a>.  <a href="http://www.ietf.org/">The Internet
  43 Engineering Task Force</a> standardised how such service could work a
  44 few years ago as <a href="http://tools.ietf.org/html/rfc3161">RFC
  45 3161</a>.  The mechanism is simple.  Create a hash of the file in
  46 question, send it to a trusted third party which add a time stamp to
  47 the hash and sign the result with its private key, and send back the
  48 signed hash + timestamp.  Both email, FTP and HTTP can be used to
  49 request such signature, depending on what is provided by the service
  50 used. Anyone with the document and the signature can then verify that
  51 the document matches the signature by creating their own hash and
  52 checking the signature using the trusted third party public key.
  53 There are several commercial services around providing such
  54 timestamping.  A quick search for
  55 "<a href="https://duckduckgo.com/?q=rfc+3161+service">rfc 3161
  56 service</a>" pointed me to at least
  57 <a href="https://www.digistamp.com/technical/how-a-digital-time-stamp-works/">DigiStamp</a>,
  58 <a href="http://www.quovadisglobal.co.uk/CertificateServices/SigningServices/TimeStamp.aspx">Quo
  59 Vadis</a>,
  60 <a href="https://www.globalsign.com/timestamp-service/">Global Sign</a>
  61 and <a href="http://www.globaltrustfinder.com/TSADefault.aspx">Global
  62 Trust Finder</a>.  The system work as long as the private key of the
  63 trusted third party is not compromised.</p>
  64
  65 <p>But as far as I can tell, there are very few public trusted
  66 timestamp services available for everyone.  I've been looking for one
  67 for a while now. But yesterday I found one over at
  68 <a href="https://www.pki.dfn.de/zeitstempeldienst/">Deutches
  69 Forschungsnetz</a> mentioned in
  70 <a href="http://www.d-mueller.de/blog/dealing-with-trusted-timestamps-in-php-rfc-3161/">a
  71 blog by David Müller</a>.  I then found
  72 <a href="http://www.rz.uni-greifswald.de/support/dfn-pki-zertifikate/zeitstempeldienst.html">a
  73 good recipe on how to use the service</a> over at the University of
  74 Greifswald.</p>
  75
  76 <p><a href="http://www.openssl.org/">The OpenSSL library</a> contain
  77 both server and tools to use and set up your own signing service.  See
  78 the ts(1SSL), tsget(1SSL) manual pages for more details.  The
  79 following shell script demonstrate how to extract a signed timestamp
  80 for any file on the disk in a Debian environment:</p>
  81
  82 <p><blockquote><pre>
  83 #!/bin/sh
  84 set -e
  85 url="http://zeitstempel.dfn.de"
  86 caurl="https://pki.pca.dfn.de/global-services-ca/pub/cacert/chain.txt"
  87 reqfile=$(mktemp -t tmp.XXXXXXXXXX.tsq)
  88 resfile=$(mktemp -t tmp.XXXXXXXXXX.tsr)
  89 cafile=chain.txt
  90 if [ ! -f $cafile ] ; then
  91     wget -O $cafile "$caurl"
  92 fi
  93 openssl ts -query -data "$1" -cert | tee "$reqfile" \
  94     | /usr/lib/ssl/misc/tsget -h "$url" -o "$resfile"
  95 openssl ts -reply -in "$resfile" -text 1>&2
  96 openssl ts -verify -data "$1" -in "$resfile" -CAfile "$cafile" 1>&2
  97 base64 < "$resfile"
  98 rm "$reqfile" "$resfile"
  99 </pre></blockquote></p>
 100
 101 <p>The argument to the script is the file to timestamp, and the output
 102 is a base64 encoded version of the signature to STDOUT and details
 103 about the signature to STDERR.  Note that due to
 104 <a href="http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=742553">a bug
 105 in the tsget script</a>, you might need to modify the included script
 106 and remove the last line.  Or just write your own HTTP uploader using
 107 curl. :) Now you too can prove and verify that files have not been
 108 changed.</p>
 109
 110 <p>But the Internet need more public trusted timestamp services.
 111 Perhaps something for <a href="http://www.uninett.no/">Uninett</a> or
 112 my work place the <a href="http://www.uio.no/">University of Oslo</a>
 113 to set up?</p>
 114 </div>
 115
 116       <div class="tags">Tags: <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet</a>.</div>
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 327
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 329
 330 <li>2011
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 354
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 356
 357 </ul></li>
 358
 359 <li>2010
 360 <ul>
 361
 362 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
 363
 364 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
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 367
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 369
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 375
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 377
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 379
 380 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/10/">October (9)</a></li>
 381
 382 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/11/">November (13)</a></li>
 383
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 385
 386 </ul></li>
 387
 388 <li>2009
 389 <ul>
 390
 391 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
 392
 393 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
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 397 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/04/">April (10)</a></li>
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 400
 401 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/06/">June (3)</a></li>
 402
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 405 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/08/">August (3)</a></li>
 406
 407 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
 408
 409 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
 410
 411 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
 412
 413 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
 414
 415 </ul></li>
 416
 417 <li>2008
 418 <ul>
 419
 420 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 421
 422 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 423
 424 </ul></li>
 425
 426 </ul>
 427
 428
 429
 430 <h2>Tags</h2>
 431 <ul>
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 469  <li><a href="http://people.skolelinux.org/pere/blog/tags/freeculture">freeculture (32)</a></li>
 470
 471  <li><a href="http://people.skolelinux.org/pere/blog/tags/freedombox">freedombox (9)</a></li>
 472
 473  <li><a href="http://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen (19)</a></li>
 474
 475  <li><a href="http://people.skolelinux.org/pere/blog/tags/h264">h264 (20)</a></li>
 476
 477  <li><a href="http://people.skolelinux.org/pere/blog/tags/intervju">intervju (42)</a></li>
 478
 479  <li><a href="http://people.skolelinux.org/pere/blog/tags/isenkram">isenkram (16)</a></li>
 480
 481  <li><a href="http://people.skolelinux.org/pere/blog/tags/kart">kart (20)</a></li>
 482
 483  <li><a href="http://people.skolelinux.org/pere/blog/tags/kodi">kodi (4)</a></li>
 484
 485  <li><a href="http://people.skolelinux.org/pere/blog/tags/ldap">ldap (9)</a></li>
 486
 487  <li><a href="http://people.skolelinux.org/pere/blog/tags/lego">lego (4)</a></li>
 488
 489  <li><a href="http://people.skolelinux.org/pere/blog/tags/lenker">lenker (8)</a></li>
 490
 491  <li><a href="http://people.skolelinux.org/pere/blog/tags/lsdvd">lsdvd (2)</a></li>
 492
 493  <li><a href="http://people.skolelinux.org/pere/blog/tags/ltsp">ltsp (1)</a></li>
 494
 495  <li><a href="http://people.skolelinux.org/pere/blog/tags/mesh network">mesh network (8)</a></li>
 496
 497  <li><a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (41)</a></li>
 498
 499  <li><a href="http://people.skolelinux.org/pere/blog/tags/nice free software">nice free software (11)</a></li>
 500
 501  <li><a href="http://people.skolelinux.org/pere/blog/tags/norsk">norsk (300)</a></li>
 502
 503  <li><a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug (191)</a></li>
 504
 505  <li><a href="http://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn (34)</a></li>
 506
 507  <li><a href="http://people.skolelinux.org/pere/blog/tags/open311">open311 (2)</a></li>
 508
 509  <li><a href="http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (72)</a></li>
 510
 511  <li><a href="http://people.skolelinux.org/pere/blog/tags/personvern">personvern (108)</a></li>
 512
 513  <li><a href="http://people.skolelinux.org/pere/blog/tags/raid">raid (2)</a></li>
 514
 515  <li><a href="http://people.skolelinux.org/pere/blog/tags/reactos">reactos (1)</a></li>
 516
 517  <li><a href="http://people.skolelinux.org/pere/blog/tags/reprap">reprap (11)</a></li>
 518
 519  <li><a href="http://people.skolelinux.org/pere/blog/tags/rfid">rfid (3)</a></li>
 520
 521  <li><a href="http://people.skolelinux.org/pere/blog/tags/robot">robot (10)</a></li>
 522
 523  <li><a href="http://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
 524
 525  <li><a href="http://people.skolelinux.org/pere/blog/tags/ruter">ruter (6)</a></li>
 526
 527  <li><a href="http://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (2)</a></li>
 528
 529  <li><a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (55)</a></li>
 530
 531  <li><a href="http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (4)</a></li>
 532
 533  <li><a href="http://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (5)</a></li>
 534
 535  <li><a href="http://people.skolelinux.org/pere/blog/tags/standard">standard (58)</a></li>
 536
 537  <li><a href="http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (6)</a></li>
 538
 539  <li><a href="http://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (12)</a></li>
 540
 541  <li><a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (55)</a></li>
 542
 543  <li><a href="http://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (4)</a></li>
 544
 545  <li><a href="http://people.skolelinux.org/pere/blog/tags/usenix">usenix (2)</a></li>
 546
 547  <li><a href="http://people.skolelinux.org/pere/blog/tags/valg">valg (9)</a></li>
 548
 549  <li><a href="http://people.skolelinux.org/pere/blog/tags/verkidetfri">verkidetfri (13)</a></li>
 550
 551  <li><a href="http://people.skolelinux.org/pere/blog/tags/video">video (70)</a></li>
 552
 553  <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
 554
 555  <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (42)</a></li>
 556
 557 </ul>
 558
 559
 560     </div>
 561     <p style="text-align: right">
 562  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 563 </p>
 564
 565   </body>
 566 </html>