X-Git-Url: https://pere.pagekite.me/gitweb/homepage.git/blobdiff_plain/0db51edbd1f5b7a3981ebe913f6643b35c0ae062..544bc31ab71c23c6b2a1ffa6677fd2329899344d:/blog/index.rss diff --git a/blog/index.rss b/blog/index.rss index 35433e052b..94f3cf3ceb 100644 --- a/blog/index.rss +++ b/blog/index.rss @@ -6,6 +6,60 @@ http://people.skolelinux.org/pere/blog/ + + Free software car computer solution? + http://people.skolelinux.org/pere/blog/Free_software_car_computer_solution_.html + http://people.skolelinux.org/pere/blog/Free_software_car_computer_solution_.html + Thu, 29 May 2014 18:45:00 +0200 + <p>Dear lazyweb. I'm planning to set up a small Raspberry Pi computer +in my car, connected to +<a href="http://www.dx.com/p/400a-4-0-tft-lcd-digital-monitor-for-vehicle-parking-reverse-camera-1440x272-12v-dc-57776">a +small screen</a> next to the rear mirror. I plan to hook it up with a +GPL and a USB wifi card too. The idea is to get my own +"<a href="http://en.wikipedia.org/wiki/Carputer">Carputer</a>". But I +wonder if someone already created a good free software solution for +such car computer.</p> + +<p>This is my current wish list for such system:</p> + +<ul> + + <li>Work on Raspberry Pi.</li> + + <li>Show current speed limit based on location, and warn if going too + fast (for example using color codes yellow and red on the screen, + or make a sound). This could be done either using either data from + <a href="http://www.openstreetmap.org/">Openstreetmap</a> or OCR + info gathered from a dashboard camera.</li> + + <li>Track automatic toll road passes and their cost, show total spent + and make it possible to calculate toll costs for planned + route.</li> + + <li>Collect GPX tracks for use with OpenStreetMap.</li> + + <li>Automatically detect and use any wireless connection to connect + to home server. Try IP over DNS + (<a href="http://dev.kryo.se/iodine/">iodine</a>) or ICMP + (<a href="http://code.gerade.org/hans/">Hans</a>) if direct + connection do not work.</li> + + <li>Set up mesh network to talk to other cars with the same system, + or some stanard car mesh protocol.</li> + + <li>Warn when approaching speed cameras and speed camera ranges + (speed calculated between two cameras).</li> + + <li>Suport dashboard/front facing camera to discover speed limits and + run OCR to track registration number of passing cars.</li> + +</ul> + +<p>If you know of any free software car computer system supporting +some or all of these features, please let me know.</p> + + + Half the Coverity issues in Gnash fixed in the next release http://people.skolelinux.org/pere/blog/Half_the_Coverity_issues_in_Gnash_fixed_in_the_next_release.html @@ -851,102 +905,5 @@ side om filmen om datalagringsdirektivet</a> om fem dager. Hold et - - Public Trusted Timestamping services for everyone - http://people.skolelinux.org/pere/blog/Public_Trusted_Timestamping_services_for_everyone.html - http://people.skolelinux.org/pere/blog/Public_Trusted_Timestamping_services_for_everyone.html - Tue, 25 Mar 2014 12:50:00 +0100 - <p>Did you ever need to store logs or other files in a way that would -allow it to be used as evidence in court, and needed a way to -demonstrate without reasonable doubt that the file had not been -changed since it was created? Or, did you ever need to document that -a given document was received at some point in time, like some -archived document or the answer to an exam, and not changed after it -was received? The problem in these settings is to remove the need to -trust yourself and your computers, while still being able to prove -that a file is the same as it was at some given time in the past.</p> - -<p>A solution to these problems is to have a trusted third party -"stamp" the document and verify that at some given time the document -looked a given way. Such -<a href="https://en.wikipedia.org/wiki/Notarius">notarius</a> service -have been around for thousands of years, and its digital equivalent is -called a -<a href="http://en.wikipedia.org/wiki/Trusted_timestamping">trusted -timestamping service</a>. <a href="http://www.ietf.org/">The Internet -Engineering Task Force</a> standardised how such service could work a -few years ago as <a href="http://tools.ietf.org/html/rfc3161">RFC -3161</a>. The mechanism is simple. Create a hash of the file in -question, send it to a trusted third party which add a time stamp to -the hash and sign the result with its private key, and send back the -signed hash + timestamp. Both email, FTP and HTTP can be used to -request such signature, depending on what is provided by the service -used. Anyone with the document and the signature can then verify that -the document matches the signature by creating their own hash and -checking the signature using the trusted third party public key. -There are several commercial services around providing such -timestamping. A quick search for -"<a href="https://duckduckgo.com/?q=rfc+3161+service">rfc 3161 -service</a>" pointed me to at least -<a href="https://www.digistamp.com/technical/how-a-digital-time-stamp-works/">DigiStamp</a>, -<a href="http://www.quovadisglobal.co.uk/CertificateServices/SigningServices/TimeStamp.aspx">Quo -Vadis</a>, -<a href="https://www.globalsign.com/timestamp-service/">Global Sign</a> -and <a href="http://www.globaltrustfinder.com/TSADefault.aspx">Global -Trust Finder</a>. The system work as long as the private key of the -trusted third party is not compromised.</p> - -<p>But as far as I can tell, there are very few public trusted -timestamp services available for everyone. I've been looking for one -for a while now. But yesterday I found one over at -<a href="https://www.pki.dfn.de/zeitstempeldienst/">Deutches -Forschungsnetz</a> mentioned in -<a href="http://www.d-mueller.de/blog/dealing-with-trusted-timestamps-in-php-rfc-3161/">a -blog by David Müller</a>. I then found -<a href="http://www.rz.uni-greifswald.de/support/dfn-pki-zertifikate/zeitstempeldienst.html">a -good recipe on how to use the service</a> over at the University of -Greifswald.</p> - -<p><a href="http://www.openssl.org/">The OpenSSL library</a> contain -both server and tools to use and set up your own signing service. See -the ts(1SSL), tsget(1SSL) manual pages for more details. The -following shell script demonstrate how to extract a signed timestamp -for any file on the disk in a Debian environment:</p> - -<p><blockquote><pre> -#!/bin/sh -set -e -url="http://zeitstempel.dfn.de" -caurl="https://pki.pca.dfn.de/global-services-ca/pub/cacert/chain.txt" -reqfile=$(mktemp -t tmp.XXXXXXXXXX.tsq) -resfile=$(mktemp -t tmp.XXXXXXXXXX.tsr) -cafile=chain.txt -if [ ! -f $cafile ] ; then - wget -O $cafile "$caurl" -fi -openssl ts -query -data "$1" -cert | tee "$reqfile" \ - | /usr/lib/ssl/misc/tsget -h "$url" -o "$resfile" -openssl ts -reply -in "$resfile" -text 1>&2 -openssl ts -verify -data "$1" -in "$resfile" -CAfile "$cafile" 1>&2 -base64 < "$resfile" -rm "$reqfile" "$resfile" -</pre></blockquote></p> - -<p>The argument to the script is the file to timestamp, and the output -is a base64 encoded version of the signature to STDOUT and details -about the signature to STDERR. Note that due to -<a href="http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=742553">a bug -in the tsget script</a>, you might need to modify the included script -and remove the last line. Or just write your own HTTP uploader using -curl. :) Now you too can prove and verify that files have not been -changed.</p> - -<p>But the Internet need more public trusted timestamp services. -Perhaps something for <a href="http://www.uninett.no/">Uninett</a> or -my work place the <a href="http://www.uio.no/">University of Oslo</a> -to set up?</p> - - -