blog/syslog_trusted_timestamp___chain_of_trusted_timestamps_for_your_syslog.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: syslog-trusted-timestamp - chain of trusted timestamps for your syslog</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">syslog-trusted-timestamp - chain of trusted timestamps for your syslog</div>
  24       <div class="date"> 2nd April 2016</div>
  25       <div class="body"><p>Two years ago, I had
  26 <a href="http://people.skolelinux.org/pere/blog/Public_Trusted_Timestamping_services_for_everyone.html">a
  27 look at trusted timestamping options available</a>, and among
  28 other things noted a still open
  29 <a href="https://bugs.debian.org/742553">bug in the tsget script</a>
  30 included in openssl that made it harder than necessary to use openssl
  31 as a trusted timestamping client.  A few days ago I was told
  32 <a href="https:/www.difi.no/">the Norwegian government office DIFI</a> is
  33 close to releasing their own trusted timestamp service, and in the
  34 process I was happy to learn about a replacement for the tsget script
  35 using only curl:</p>
  36
  37 <p><pre>
  38 openssl ts -query -data "/etc/shells" -cert -sha256 -no_nonce \
  39   | curl -s -H "Content-Type: application/timestamp-query" \
  40          --data-binary "@-" http://zeitstempel.dfn.de > etc-shells.tsr
  41 openssl ts -reply -text -in etc-shells.tsr
  42 </pre></p>
  43
  44 <p>This produces a binary timestamp file (etc-shells.tsr) which can be
  45 used to verify that the content of the file /etc/shell with the
  46 calculated sha256 hash existed at the point in time when the request
  47 was made.  The last command extract the content of the etc-shells.tsr
  48 in human readable form.  The idea behind such timestamp is to be able
  49 to prove using cryptography that the content of a file have not
  50 changed since the file was stamped.</p>
  51
  52 <p>To verify that the file on disk match the public key signature in
  53 the timestamp file, run the following commands.  It make sure you have
  54 the required certificate for the trusted timestamp service available
  55 and use it to compare the file content with the timestamp.  In
  56 production, one should of course use a better method to verify the
  57 service certificate.</p>
  58
  59 <p><pre>
  60 wget -O ca-cert.txt https://pki.pca.dfn.de/global-services-ca/pub/cacert/chain.txt
  61 openssl ts -verify -data /etc/shells -in etc-shells.tsr -CAfile ca-cert.txt -text
  62 </pre></p>
  63
  64 <p>Wikipedia have a lot more information about
  65 <a href="https://en.wikipedia.org/wiki/Trusted_timestamping">trusted
  66 Timestamping</a> and
  67 <a href="https://en.wikipedia.org/wiki/Linked_timestamping">linked
  68 timestamping</a>, and there are several trusted timestamping services
  69 around, both as commercial services and as free and public services.
  70 Among the latter is
  71 <a href="https://www.pki.dfn.de/zeitstempeldienst/">the
  72 zeitstempel.dfn.de service</a> mentioned above and
  73 <a href="https://freetsa.org/">freetsa.org service</a> linked to from the
  74 wikipedia web site.  I believe the DIFI service should show up on
  75 https://tsa.difi.no, but it is not available to the public at the
  76 moment.  I hope this will change when it is into production.  The
  77 <a href="https://tools.ietf.org/html/rfc3161">RFC 3161</a> trusted
  78 timestamping protocol standard is even implemented in LibreOffice,
  79 Microsoft Office and Adobe Acrobat, making it possible to verify when
  80 a document was created.</p>
  81
  82 <p>I would find it useful to be able to use such trusted timestamp
  83 service to make it possible to verify that my stored syslog files have
  84 not been tampered with.  This is not a new idea.  I found one example
  85 implemented on the Endian network appliances where
  86 <a href="http://help.endian.com/entries/21518508-Enabling-Timestamping-on-log-files-">the
  87 configuration of such feature was described in 2012</a>.</p>
  88
  89 <p>But I could not find any free implementation of such feature when I
  90 searched, so I decided to try to
  91 <a href="https://github.com/petterreinholdtsen/syslog-trusted-timestamp">build
  92 a prototype named syslog-trusted-timestamp</a>.  My idea is to
  93 generate a timestamp of the old log files after they are rotated, and
  94 store the timestamp in the new log file just after rotation.  This
  95 will form a chain that would make it possible to see if any old log
  96 files are tampered with.  But syslog is bad at handling kilobytes of
  97 binary data, so I decided to base64 encode the timestamp and add an ID
  98 and line sequence numbers to the base64 data to make it possible to
  99 reassemble the timestamp file again.  To use it, simply run it like
 100 this:
 101
 102 <p><pre>
 103 syslog-trusted-timestamp /path/to/list-of-log-files
 104 </pre></p>
 105
 106 <p>This will send a timestamp from one or more timestamp services (not
 107 yet decided nor implemented) for each listed file to the syslog using
 108 logger(1).  To verify the timestamp, the same program is used with the
 109 --verify option:</p>
 110
 111 <p><pre>
 112 syslog-trusted-timestamp --verify /path/to/log-file /path/to/log-with-timestamp
 113 </pre></p>
 114
 115 <p>The verification step is not yet well designed.  The current
 116 implementation depend on the file path being unique and unchanging,
 117 and this is not a solid assumption.  It also uses process number as
 118 timestamp ID, and this is bound to create ID collisions.  I hope to
 119 have time to come up with a better way to handle timestamp IDs and
 120 verification later.</p>
 121
 122 <p>Please check out
 123 <a href="https://github.com/petterreinholdtsen/syslog-trusted-timestamp">the
 124 prototype for syslog-trusted-timestamp on github</a> and send
 125 suggestions and improvement, or let me know if there already exist a
 126 similar system for timestamping logs already to allow me to join
 127 forces with others with the same interest.</p>
 128
 129 <p>As usual, if you use Bitcoin and want to show your support of my
 130 activities, please send Bitcoin donations to my address
 131 <b><a href="bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b</a></b>.</p>
 132 </div>
 133
 134       <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>
 135
 136
 137     </div>
 138
 139
 140
 141
 142     <div id="sidebar">
 143
 144
 145
 146 <h2>Archive</h2>
 147 <ul>
 148
 149 <li>2018
 150 <ul>
 151
 152 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/01/">January (1)</a></li>
 153
 154 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/02/">February (5)</a></li>
 155
 156 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/03/">March (5)</a></li>
 157
 158 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/04/">April (3)</a></li>
 159
 160 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/06/">June (2)</a></li>
 161
 162 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/07/">July (2)</a></li>
 163
 164 </ul></li>
 165
 166 <li>2017
 167 <ul>
 168
 169 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/01/">January (4)</a></li>
 170
 171 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/02/">February (3)</a></li>
 172
 173 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/03/">March (5)</a></li>
 174
 175 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/04/">April (2)</a></li>
 176
 177 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/06/">June (5)</a></li>
 178
 179 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/07/">July (1)</a></li>
 180
 181 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/08/">August (1)</a></li>
 182
 183 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/09/">September (3)</a></li>
 184
 185 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/10/">October (5)</a></li>
 186
 187 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/11/">November (3)</a></li>
 188
 189 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/12/">December (4)</a></li>
 190
 191 </ul></li>
 192
 193 <li>2016
 194 <ul>
 195
 196 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/01/">January (3)</a></li>
 197
 198 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/02/">February (2)</a></li>
 199
 200 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/03/">March (3)</a></li>
 201
 202 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/04/">April (8)</a></li>
 203
 204 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/05/">May (8)</a></li>
 205
 206 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/06/">June (2)</a></li>
 207
 208 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/07/">July (2)</a></li>
 209
 210 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/08/">August (5)</a></li>
 211
 212 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/09/">September (2)</a></li>
 213
 214 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/10/">October (3)</a></li>
 215
 216 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/11/">November (8)</a></li>
 217
 218 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/12/">December (5)</a></li>
 219
 220 </ul></li>
 221
 222 <li>2015
 223 <ul>
 224
 225 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/01/">January (7)</a></li>
 226
 227 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/02/">February (6)</a></li>
 228
 229 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/03/">March (1)</a></li>
 230
 231 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/04/">April (4)</a></li>
 232
 233 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/05/">May (3)</a></li>
 234
 235 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/06/">June (4)</a></li>
 236
 237 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/07/">July (6)</a></li>
 238
 239 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/08/">August (2)</a></li>
 240
 241 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/09/">September (2)</a></li>
 242
 243 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/10/">October (9)</a></li>
 244
 245 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/11/">November (6)</a></li>
 246
 247 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/12/">December (3)</a></li>
 248
 249 </ul></li>
 250
 251 <li>2014
 252 <ul>
 253
 254 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/01/">January (2)</a></li>
 255
 256 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/02/">February (3)</a></li>
 257
 258 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/03/">March (8)</a></li>
 259
 260 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/04/">April (7)</a></li>
 261
 262 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/05/">May (1)</a></li>
 263
 264 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/06/">June (2)</a></li>
 265
 266 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/07/">July (2)</a></li>
 267
 268 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/08/">August (2)</a></li>
 269
 270 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/09/">September (5)</a></li>
 271
 272 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/10/">October (6)</a></li>
 273
 274 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/11/">November (3)</a></li>
 275
 276 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/12/">December (5)</a></li>
 277
 278 </ul></li>
 279
 280 <li>2013
 281 <ul>
 282
 283 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/01/">January (11)</a></li>
 284
 285 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/02/">February (9)</a></li>
 286
 287 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/03/">March (9)</a></li>
 288
 289 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/04/">April (6)</a></li>
 290
 291 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/05/">May (9)</a></li>
 292
 293 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/06/">June (10)</a></li>
 294
 295 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/07/">July (7)</a></li>
 296
 297 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/08/">August (3)</a></li>
 298
 299 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/09/">September (5)</a></li>
 300
 301 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/10/">October (7)</a></li>
 302
 303 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/11/">November (9)</a></li>
 304
 305 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/12/">December (3)</a></li>
 306
 307 </ul></li>
 308
 309 <li>2012
 310 <ul>
 311
 312 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/01/">January (7)</a></li>
 313
 314 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/02/">February (10)</a></li>
 315
 316 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/03/">March (17)</a></li>
 317
 318 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/04/">April (12)</a></li>
 319
 320 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/05/">May (12)</a></li>
 321
 322 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/06/">June (20)</a></li>
 323
 324 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/07/">July (17)</a></li>
 325
 326 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/08/">August (6)</a></li>
 327
 328 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/09/">September (9)</a></li>
 329
 330 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/10/">October (17)</a></li>
 331
 332 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/11/">November (10)</a></li>
 333
 334 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/12/">December (7)</a></li>
 335
 336 </ul></li>
 337
 338 <li>2011
 339 <ul>
 340
 341 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/01/">January (16)</a></li>
 342
 343 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/02/">February (6)</a></li>
 344
 345 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/03/">March (6)</a></li>
 346
 347 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/04/">April (7)</a></li>
 348
 349 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/05/">May (3)</a></li>
 350
 351 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/06/">June (2)</a></li>
 352
 353 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/07/">July (7)</a></li>
 354
 355 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/08/">August (6)</a></li>
 356
 357 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/09/">September (4)</a></li>
 358
 359 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/10/">October (2)</a></li>
 360
 361 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/11/">November (3)</a></li>
 362
 363 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/12/">December (1)</a></li>
 364
 365 </ul></li>
 366
 367 <li>2010
 368 <ul>
 369
 370 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
 371
 372 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
 373
 374 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/03/">March (3)</a></li>
 375
 376 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/04/">April (3)</a></li>
 377
 378 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/05/">May (9)</a></li>
 379
 380 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/06/">June (14)</a></li>
 381
 382 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/07/">July (12)</a></li>
 383
 384 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/08/">August (13)</a></li>
 385
 386 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/09/">September (7)</a></li>
 387
 388 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/10/">October (9)</a></li>
 389
 390 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/11/">November (13)</a></li>
 391
 392 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
 393
 394 </ul></li>
 395
 396 <li>2009
 397 <ul>
 398
 399 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
 400
 401 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
 402
 403 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/03/">March (12)</a></li>
 404
 405 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/04/">April (10)</a></li>
 406
 407 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/05/">May (9)</a></li>
 408
 409 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/06/">June (3)</a></li>
 410
 411 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/07/">July (4)</a></li>
 412
 413 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/08/">August (3)</a></li>
 414
 415 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
 416
 417 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
 418
 419 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
 420
 421 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
 422
 423 </ul></li>
 424
 425 <li>2008
 426 <ul>
 427
 428 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 429
 430 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 431
 432 </ul></li>
 433
 434 </ul>
 435
 436
 437
 438 <h2>Tags</h2>
 439 <ul>
 440
 441  <li><a href="http://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (16)</a></li>
 442
 443  <li><a href="http://people.skolelinux.org/pere/blog/tags/amiga">amiga (1)</a></li>
 444
 445  <li><a href="http://people.skolelinux.org/pere/blog/tags/aros">aros (1)</a></li>
 446
 447  <li><a href="http://people.skolelinux.org/pere/blog/tags/bankid">bankid (4)</a></li>
 448
 449  <li><a href="http://people.skolelinux.org/pere/blog/tags/bitcoin">bitcoin (9)</a></li>
 450
 451  <li><a href="http://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem (17)</a></li>
 452
 453  <li><a href="http://people.skolelinux.org/pere/blog/tags/bsa">bsa (2)</a></li>
 454
 455  <li><a href="http://people.skolelinux.org/pere/blog/tags/chrpath">chrpath (2)</a></li>
 456
 457  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian">debian (158)</a></li>
 458
 459  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (158)</a></li>
 460
 461  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian-handbook">debian-handbook (4)</a></li>
 462
 463  <li><a href="http://people.skolelinux.org/pere/blog/tags/digistan">digistan (10)</a></li>
 464
 465  <li><a href="http://people.skolelinux.org/pere/blog/tags/dld">dld (17)</a></li>
 466
 467  <li><a href="http://people.skolelinux.org/pere/blog/tags/docbook">docbook (25)</a></li>
 468
 469  <li><a href="http://people.skolelinux.org/pere/blog/tags/drivstoffpriser">drivstoffpriser (4)</a></li>
 470
 471  <li><a href="http://people.skolelinux.org/pere/blog/tags/english">english (376)</a></li>
 472
 473  <li><a href="http://people.skolelinux.org/pere/blog/tags/fiksgatami">fiksgatami (23)</a></li>
 474
 475  <li><a href="http://people.skolelinux.org/pere/blog/tags/fildeling">fildeling (13)</a></li>
 476
 477  <li><a href="http://people.skolelinux.org/pere/blog/tags/freeculture">freeculture (32)</a></li>
 478
 479  <li><a href="http://people.skolelinux.org/pere/blog/tags/freedombox">freedombox (9)</a></li>
 480
 481  <li><a href="http://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen (18)</a></li>
 482
 483  <li><a href="http://people.skolelinux.org/pere/blog/tags/h264">h264 (20)</a></li>
 484
 485  <li><a href="http://people.skolelinux.org/pere/blog/tags/intervju">intervju (42)</a></li>
 486
 487  <li><a href="http://people.skolelinux.org/pere/blog/tags/isenkram">isenkram (16)</a></li>
 488
 489  <li><a href="http://people.skolelinux.org/pere/blog/tags/kart">kart (20)</a></li>
 490
 491  <li><a href="http://people.skolelinux.org/pere/blog/tags/ldap">ldap (9)</a></li>
 492
 493  <li><a href="http://people.skolelinux.org/pere/blog/tags/lego">lego (4)</a></li>
 494
 495  <li><a href="http://people.skolelinux.org/pere/blog/tags/lenker">lenker (8)</a></li>
 496
 497  <li><a href="http://people.skolelinux.org/pere/blog/tags/lsdvd">lsdvd (2)</a></li>
 498
 499  <li><a href="http://people.skolelinux.org/pere/blog/tags/ltsp">ltsp (1)</a></li>
 500
 501  <li><a href="http://people.skolelinux.org/pere/blog/tags/mesh network">mesh network (8)</a></li>
 502
 503  <li><a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (41)</a></li>
 504
 505  <li><a href="http://people.skolelinux.org/pere/blog/tags/nice free software">nice free software (10)</a></li>
 506
 507  <li><a href="http://people.skolelinux.org/pere/blog/tags/norsk">norsk (299)</a></li>
 508
 509  <li><a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug (190)</a></li>
 510
 511  <li><a href="http://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn (33)</a></li>
 512
 513  <li><a href="http://people.skolelinux.org/pere/blog/tags/open311">open311 (2)</a></li>
 514
 515  <li><a href="http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (71)</a></li>
 516
 517  <li><a href="http://people.skolelinux.org/pere/blog/tags/personvern">personvern (107)</a></li>
 518
 519  <li><a href="http://people.skolelinux.org/pere/blog/tags/raid">raid (2)</a></li>
 520
 521  <li><a href="http://people.skolelinux.org/pere/blog/tags/reactos">reactos (1)</a></li>
 522
 523  <li><a href="http://people.skolelinux.org/pere/blog/tags/reprap">reprap (11)</a></li>
 524
 525  <li><a href="http://people.skolelinux.org/pere/blog/tags/rfid">rfid (3)</a></li>
 526
 527  <li><a href="http://people.skolelinux.org/pere/blog/tags/robot">robot (10)</a></li>
 528
 529  <li><a href="http://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
 530
 531  <li><a href="http://people.skolelinux.org/pere/blog/tags/ruter">ruter (6)</a></li>
 532
 533  <li><a href="http://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (2)</a></li>
 534
 535  <li><a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (54)</a></li>
 536
 537  <li><a href="http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (4)</a></li>
 538
 539  <li><a href="http://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (5)</a></li>
 540
 541  <li><a href="http://people.skolelinux.org/pere/blog/tags/standard">standard (55)</a></li>
 542
 543  <li><a href="http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (6)</a></li>
 544
 545  <li><a href="http://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (12)</a></li>
 546
 547  <li><a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (55)</a></li>
 548
 549  <li><a href="http://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (4)</a></li>
 550
 551  <li><a href="http://people.skolelinux.org/pere/blog/tags/usenix">usenix (2)</a></li>
 552
 553  <li><a href="http://people.skolelinux.org/pere/blog/tags/valg">valg (9)</a></li>
 554
 555  <li><a href="http://people.skolelinux.org/pere/blog/tags/verkidetfri">verkidetfri (11)</a></li>
 556
 557  <li><a href="http://people.skolelinux.org/pere/blog/tags/video">video (64)</a></li>
 558
 559  <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
 560
 561  <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (41)</a></li>
 562
 563 </ul>
 564
 565
 566     </div>
 567     <p style="text-align: right">
 568  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 569 </p>
 570
 571   </body>
 572 </html>