blog/Fetching_trusted_timestamps_using_the_rfc3161ng_python_module.html

   1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
   2           "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
   3 <html xmlns="http://www.w3.org/1999/xhtml" dir="ltr">
   4   <head>
   5     <meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
   6     <title>Petter Reinholdtsen: Fetching trusted timestamps using the rfc3161ng python module</title>
   7     <link rel="stylesheet" type="text/css" media="screen" href="http://people.skolelinux.org/pere/blog/style.css" />
   8     <link rel="stylesheet" type="text/css" media="screen" href="http://people.skolelinux.org/pere/blog/vim.css" />
   9
  10
  11   </head>
  12   <body>
  13     <div class="title">
  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">Fetching trusted timestamps using the rfc3161ng python module</div>
  24       <div class="date"> 8th October 2018</div>
  25       <div class="body"><p>I have  earlier covered the basics of trusted timestamping using the
  26 'openssl ts' client.  See blog post for
  27 <a href="http://people.skolelinux.org/pere/blog/Public_Trusted_Timestamping_services_for_everyone.html">2014</a>,
  28 <a href="http://people.skolelinux.org/pere/blog/syslog_trusted_timestamp___chain_of_trusted_timestamps_for_your_syslog.html">2016</a>
  29 and
  30 <a href="http://people.skolelinux.org/pere/blog/Idea_for_storing_trusted_timestamps_in_a_Noark_5_archive.html">2017</a>
  31 for those stories.  But some times I want to integrate the timestamping
  32 in other code, and recently I needed to integrate it into Python.
  33 After searching a bit, I found
  34 <a href="https://dev.entrouvert.org/projects/python-rfc3161">the
  35 rfc3161 library</a> which seemed like a good fit, but I soon
  36 discovered it only worked for python version 2, and I needed something
  37 that work with python version 3.  Luckily I next came across
  38 <a href="https://github.com/trbs/rfc3161ng/">the rfc3161ng library</a>,
  39 a fork of the original rfc3161 library.  Not only is it working with
  40 python 3, it have fixed a few of the bugs in the original library, and
  41 it has an active maintainer.  I decided to wrap it up and make it
  42 <a href="https://tracker.debian.org/pkg/python-rfc3161ng">available in
  43 Debian</a>, and a few days ago it entered Debian unstable and testing.</p>
  44
  45 <p>Using the library is fairly straight forward.  The only slightly
  46 problematic step is to fetch the required certificates to verify the
  47 timestamp.  For some services it is straight forward, while for others
  48 I have not yet figured out how to do it.  Here is a small standalone
  49 code example based on of the integration tests in the library code:</p>
  50
  51 <pre>
  52 #!/usr/bin/python3
  53
  54 """
  55
  56 Python 3 script demonstrating how to use the rfc3161ng module to
  57 get trusted timestamps.
  58
  59 The license of this code is the same as the license of the rfc3161ng
  60 library, ie MIT/BSD.
  61
  62 """
  63
  64 import os
  65 import pyasn1.codec.der
  66 import rfc3161ng
  67 import subprocess
  68 import tempfile
  69 import urllib.request
  70
  71 def store(f, data):
  72     f.write(data)
  73     f.flush()
  74     f.seek(0)
  75
  76 def fetch(url, f=None):
  77     response = urllib.request.urlopen(url)
  78     data = response.read()
  79     if f:
  80         store(f, data)
  81     return data
  82
  83 def main():
  84     with tempfile.NamedTemporaryFile() as cert_f,\
  85          tempfile.NamedTemporaryFile() as ca_f,\
  86          tempfile.NamedTemporaryFile() as msg_f,\
  87          tempfile.NamedTemporaryFile() as tsr_f:
  88
  89         # First fetch certificates used by service
  90         certificate_data = fetch('https://freetsa.org/files/tsa.crt', cert_f)
  91         ca_data_data = fetch('https://freetsa.org/files/cacert.pem', ca_f)
  92
  93         # Then timestamp the message
  94         timestamper = \
  95             rfc3161ng.RemoteTimestamper('http://freetsa.org/tsr',
  96                                         certificate=certificate_data)
  97         data = b"Python forever!\n"
  98         tsr = timestamper(data=data, return_tsr=True)
  99
 100         # Finally, convert message and response to something 'openssl ts' can verify
 101         store(msg_f, data)
 102         store(tsr_f, pyasn1.codec.der.encoder.encode(tsr))
 103         args = ["openssl", "ts", "-verify",
 104                 "-data", msg_f.name,
 105                 "-in", tsr_f.name,
 106                 "-CAfile", ca_f.name,
 107                 "-untrusted", cert_f.name]
 108         subprocess.check_call(args)
 109
 110 if '__main__' == __name__:
 111    main()
 112 </pre>
 113
 114 <p>The code fetches the required certificates, store them as temporary
 115 files, timestamp a simple message, store the message and timestamp to
 116 disk and ask 'openssl ts' to verify the timestamp.  A timestamp is
 117 around 1.5 kiB in size, and should be fairly easy to store for future
 118 use.</p>
 119
 120 <p>As usual, if you use Bitcoin and want to show your support of my
 121 activities, please send Bitcoin donations to my address
 122 <b><a href="bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b</a></b>.</p>
 123 </div>
 124
 125       <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>
 126
 127
 128     </div>
 129
 130
 131
 132
 133     <div id="sidebar">
 134
 135
 136
 137 <h2>Archive</h2>
 138 <ul>
 139
 140 <li>2018
 141 <ul>
 142
 143 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/01/">January (1)</a></li>
 144
 145 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/02/">February (5)</a></li>
 146
 147 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/03/">March (5)</a></li>
 148
 149 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/04/">April (3)</a></li>
 150
 151 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/06/">June (2)</a></li>
 152
 153 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/07/">July (5)</a></li>
 154
 155 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/08/">August (3)</a></li>
 156
 157 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/09/">September (3)</a></li>
 158
 159 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/10/">October (5)</a></li>
 160
 161 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/11/">November (2)</a></li>
 162
 163 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/12/">December (3)</a></li>
 164
 165 </ul></li>
 166
 167 <li>2017
 168 <ul>
 169
 170 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/01/">January (4)</a></li>
 171
 172 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/02/">February (3)</a></li>
 173
 174 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/03/">March (5)</a></li>
 175
 176 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/04/">April (2)</a></li>
 177
 178 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/06/">June (5)</a></li>
 179
 180 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/07/">July (1)</a></li>
 181
 182 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/08/">August (1)</a></li>
 183
 184 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/09/">September (3)</a></li>
 185
 186 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/10/">October (5)</a></li>
 187
 188 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/11/">November (3)</a></li>
 189
 190 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/12/">December (4)</a></li>
 191
 192 </ul></li>
 193
 194 <li>2016
 195 <ul>
 196
 197 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/01/">January (3)</a></li>
 198
 199 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/02/">February (2)</a></li>
 200
 201 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/03/">March (3)</a></li>
 202
 203 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/04/">April (8)</a></li>
 204
 205 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/05/">May (8)</a></li>
 206
 207 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/06/">June (2)</a></li>
 208
 209 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/07/">July (2)</a></li>
 210
 211 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/08/">August (5)</a></li>
 212
 213 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/09/">September (2)</a></li>
 214
 215 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/10/">October (3)</a></li>
 216
 217 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/11/">November (8)</a></li>
 218
 219 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/12/">December (5)</a></li>
 220
 221 </ul></li>
 222
 223 <li>2015
 224 <ul>
 225
 226 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/01/">January (7)</a></li>
 227
 228 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/02/">February (6)</a></li>
 229
 230 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/03/">March (1)</a></li>
 231
 232 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/04/">April (4)</a></li>
 233
 234 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/05/">May (3)</a></li>
 235
 236 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/06/">June (4)</a></li>
 237
 238 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/07/">July (6)</a></li>
 239
 240 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/08/">August (2)</a></li>
 241
 242 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/09/">September (2)</a></li>
 243
 244 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/10/">October (9)</a></li>
 245
 246 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/11/">November (6)</a></li>
 247
 248 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/12/">December (3)</a></li>
 249
 250 </ul></li>
 251
 252 <li>2014
 253 <ul>
 254
 255 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/01/">January (2)</a></li>
 256
 257 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/02/">February (3)</a></li>
 258
 259 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/03/">March (8)</a></li>
 260
 261 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/04/">April (7)</a></li>
 262
 263 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/05/">May (1)</a></li>
 264
 265 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/06/">June (2)</a></li>
 266
 267 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/07/">July (2)</a></li>
 268
 269 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/08/">August (2)</a></li>
 270
 271 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/09/">September (5)</a></li>
 272
 273 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/10/">October (6)</a></li>
 274
 275 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/11/">November (3)</a></li>
 276
 277 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/12/">December (5)</a></li>
 278
 279 </ul></li>
 280
 281 <li>2013
 282 <ul>
 283
 284 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/01/">January (11)</a></li>
 285
 286 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/02/">February (9)</a></li>
 287
 288 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/03/">March (9)</a></li>
 289
 290 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/04/">April (6)</a></li>
 291
 292 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/05/">May (9)</a></li>
 293
 294 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/06/">June (10)</a></li>
 295
 296 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/07/">July (7)</a></li>
 297
 298 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/08/">August (3)</a></li>
 299
 300 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/09/">September (5)</a></li>
 301
 302 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/10/">October (7)</a></li>
 303
 304 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/11/">November (9)</a></li>
 305
 306 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/12/">December (3)</a></li>
 307
 308 </ul></li>
 309
 310 <li>2012
 311 <ul>
 312
 313 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/01/">January (7)</a></li>
 314
 315 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/02/">February (10)</a></li>
 316
 317 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/03/">March (17)</a></li>
 318
 319 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/04/">April (12)</a></li>
 320
 321 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/05/">May (12)</a></li>
 322
 323 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/06/">June (20)</a></li>
 324
 325 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/07/">July (17)</a></li>
 326
 327 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/08/">August (6)</a></li>
 328
 329 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/09/">September (9)</a></li>
 330
 331 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/10/">October (17)</a></li>
 332
 333 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/11/">November (10)</a></li>
 334
 335 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/12/">December (7)</a></li>
 336
 337 </ul></li>
 338
 339 <li>2011
 340 <ul>
 341
 342 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/01/">January (16)</a></li>
 343
 344 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/02/">February (6)</a></li>
 345
 346 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/03/">March (6)</a></li>
 347
 348 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/04/">April (7)</a></li>
 349
 350 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/05/">May (3)</a></li>
 351
 352 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/06/">June (2)</a></li>
 353
 354 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/07/">July (7)</a></li>
 355
 356 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/08/">August (6)</a></li>
 357
 358 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/09/">September (4)</a></li>
 359
 360 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/10/">October (2)</a></li>
 361
 362 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/11/">November (3)</a></li>
 363
 364 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/12/">December (1)</a></li>
 365
 366 </ul></li>
 367
 368 <li>2010
 369 <ul>
 370
 371 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
 372
 373 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
 374
 375 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/03/">March (3)</a></li>
 376
 377 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/04/">April (3)</a></li>
 378
 379 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/05/">May (9)</a></li>
 380
 381 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/06/">June (14)</a></li>
 382
 383 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/07/">July (12)</a></li>
 384
 385 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/08/">August (13)</a></li>
 386
 387 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/09/">September (7)</a></li>
 388
 389 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/10/">October (9)</a></li>
 390
 391 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/11/">November (13)</a></li>
 392
 393 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
 394
 395 </ul></li>
 396
 397 <li>2009
 398 <ul>
 399
 400 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
 401
 402 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
 403
 404 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/03/">March (12)</a></li>
 405
 406 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/04/">April (10)</a></li>
 407
 408 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/05/">May (9)</a></li>
 409
 410 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/06/">June (3)</a></li>
 411
 412 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/07/">July (4)</a></li>
 413
 414 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/08/">August (3)</a></li>
 415
 416 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
 417
 418 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
 419
 420 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
 421
 422 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
 423
 424 </ul></li>
 425
 426 <li>2008
 427 <ul>
 428
 429 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 430
 431 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 432
 433 </ul></li>
 434
 435 </ul>
 436
 437
 438
 439 <h2>Tags</h2>
 440 <ul>
 441
 442  <li><a href="http://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (16)</a></li>
 443
 444  <li><a href="http://people.skolelinux.org/pere/blog/tags/amiga">amiga (1)</a></li>
 445
 446  <li><a href="http://people.skolelinux.org/pere/blog/tags/aros">aros (1)</a></li>
 447
 448  <li><a href="http://people.skolelinux.org/pere/blog/tags/bankid">bankid (4)</a></li>
 449
 450  <li><a href="http://people.skolelinux.org/pere/blog/tags/bitcoin">bitcoin (10)</a></li>
 451
 452  <li><a href="http://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem (17)</a></li>
 453
 454  <li><a href="http://people.skolelinux.org/pere/blog/tags/bsa">bsa (2)</a></li>
 455
 456  <li><a href="http://people.skolelinux.org/pere/blog/tags/chrpath">chrpath (2)</a></li>
 457
 458  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian">debian (164)</a></li>
 459
 460  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (158)</a></li>
 461
 462  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian-handbook">debian-handbook (4)</a></li>
 463
 464  <li><a href="http://people.skolelinux.org/pere/blog/tags/digistan">digistan (10)</a></li>
 465
 466  <li><a href="http://people.skolelinux.org/pere/blog/tags/dld">dld (17)</a></li>
 467
 468  <li><a href="http://people.skolelinux.org/pere/blog/tags/docbook">docbook (25)</a></li>
 469
 470  <li><a href="http://people.skolelinux.org/pere/blog/tags/drivstoffpriser">drivstoffpriser (4)</a></li>
 471
 472  <li><a href="http://people.skolelinux.org/pere/blog/tags/english">english (394)</a></li>
 473
 474  <li><a href="http://people.skolelinux.org/pere/blog/tags/fiksgatami">fiksgatami (23)</a></li>
 475
 476  <li><a href="http://people.skolelinux.org/pere/blog/tags/fildeling">fildeling (13)</a></li>
 477
 478  <li><a href="http://people.skolelinux.org/pere/blog/tags/freeculture">freeculture (32)</a></li>
 479
 480  <li><a href="http://people.skolelinux.org/pere/blog/tags/freedombox">freedombox (9)</a></li>
 481
 482  <li><a href="http://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen (19)</a></li>
 483
 484  <li><a href="http://people.skolelinux.org/pere/blog/tags/h264">h264 (20)</a></li>
 485
 486  <li><a href="http://people.skolelinux.org/pere/blog/tags/intervju">intervju (42)</a></li>
 487
 488  <li><a href="http://people.skolelinux.org/pere/blog/tags/isenkram">isenkram (16)</a></li>
 489
 490  <li><a href="http://people.skolelinux.org/pere/blog/tags/kart">kart (20)</a></li>
 491
 492  <li><a href="http://people.skolelinux.org/pere/blog/tags/kodi">kodi (4)</a></li>
 493
 494  <li><a href="http://people.skolelinux.org/pere/blog/tags/ldap">ldap (9)</a></li>
 495
 496  <li><a href="http://people.skolelinux.org/pere/blog/tags/lego">lego (4)</a></li>
 497
 498  <li><a href="http://people.skolelinux.org/pere/blog/tags/lenker">lenker (8)</a></li>
 499
 500  <li><a href="http://people.skolelinux.org/pere/blog/tags/lsdvd">lsdvd (2)</a></li>
 501
 502  <li><a href="http://people.skolelinux.org/pere/blog/tags/ltsp">ltsp (1)</a></li>
 503
 504  <li><a href="http://people.skolelinux.org/pere/blog/tags/mesh network">mesh network (8)</a></li>
 505
 506  <li><a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (41)</a></li>
 507
 508  <li><a href="http://people.skolelinux.org/pere/blog/tags/nice free software">nice free software (11)</a></li>
 509
 510  <li><a href="http://people.skolelinux.org/pere/blog/tags/norsk">norsk (300)</a></li>
 511
 512  <li><a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug (191)</a></li>
 513
 514  <li><a href="http://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn (34)</a></li>
 515
 516  <li><a href="http://people.skolelinux.org/pere/blog/tags/open311">open311 (2)</a></li>
 517
 518  <li><a href="http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (72)</a></li>
 519
 520  <li><a href="http://people.skolelinux.org/pere/blog/tags/personvern">personvern (108)</a></li>
 521
 522  <li><a href="http://people.skolelinux.org/pere/blog/tags/raid">raid (2)</a></li>
 523
 524  <li><a href="http://people.skolelinux.org/pere/blog/tags/reactos">reactos (1)</a></li>
 525
 526  <li><a href="http://people.skolelinux.org/pere/blog/tags/reprap">reprap (11)</a></li>
 527
 528  <li><a href="http://people.skolelinux.org/pere/blog/tags/rfid">rfid (3)</a></li>
 529
 530  <li><a href="http://people.skolelinux.org/pere/blog/tags/robot">robot (10)</a></li>
 531
 532  <li><a href="http://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
 533
 534  <li><a href="http://people.skolelinux.org/pere/blog/tags/ruter">ruter (6)</a></li>
 535
 536  <li><a href="http://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (2)</a></li>
 537
 538  <li><a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (55)</a></li>
 539
 540  <li><a href="http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (4)</a></li>
 541
 542  <li><a href="http://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (5)</a></li>
 543
 544  <li><a href="http://people.skolelinux.org/pere/blog/tags/standard">standard (58)</a></li>
 545
 546  <li><a href="http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (6)</a></li>
 547
 548  <li><a href="http://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (12)</a></li>
 549
 550  <li><a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (55)</a></li>
 551
 552  <li><a href="http://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (4)</a></li>
 553
 554  <li><a href="http://people.skolelinux.org/pere/blog/tags/usenix">usenix (2)</a></li>
 555
 556  <li><a href="http://people.skolelinux.org/pere/blog/tags/valg">valg (9)</a></li>
 557
 558  <li><a href="http://people.skolelinux.org/pere/blog/tags/verkidetfri">verkidetfri (14)</a></li>
 559
 560  <li><a href="http://people.skolelinux.org/pere/blog/tags/video">video (71)</a></li>
 561
 562  <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
 563
 564  <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (42)</a></li>
 565
 566 </ul>
 567
 568
 569     </div>
 570     <p style="text-align: right">
 571  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 572 </p>
 573
 574   </body>
 575 </html>