New interview.

[homepage.git] / blog / index.rss

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@@ -6,6 +6,121 @@
                 <link>http://people.skolelinux.org/pere/blog/</link>
                 <atom:link href="http://people.skolelinux.org/pere/blog/index.rss" rel="self" type="application/rss+xml" />
        
                 <link>http://people.skolelinux.org/pere/blog/</link>
                 <atom:link href="http://people.skolelinux.org/pere/blog/index.rss" rel="self" type="application/rss+xml" />
        

+       <item>
+               <title>Jami as a Zoom client, a trick for password protected rooms...</title>
+               <link>http://people.skolelinux.org/pere/blog/Jami_as_a_Zoom_client__a_trick_for_password_protected_rooms___.html</link>
+               <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Jami_as_a_Zoom_client__a_trick_for_password_protected_rooms___.html</guid>
+                <pubDate>Fri, 8 May 2020 13:30:00 +0200</pubDate>
+               <description>&lt;p&gt;Half a year ago,
+&lt;a href=&quot;http://people.skolelinux.org/pere/blog/Jami_Ring__finally_functioning_peer_to_peer_communication_client.html&quot;&gt;I
+wrote&lt;/a&gt; about &lt;a href=&quot;https://jami.net/&quot;&gt;the Jami communication
+client&lt;/a&gt;, capable of peer-to-peer encrypted communication.  It
+handle both messages, audio and video.  It uses distributed hash
+tables instead of central infrastructure to connect its users to each
+other, which in my book is a plus.  I mentioned briefly that it could
+also work as a SIP client, which came in handy when the higher
+educational sector in Norway started to promote Zoom as its video
+conferencing solution.  I am reluctant to use the official Zoom client
+software, due to their &lt;a href=&quot;https://zoom.us/terms&quot;&gt;copyright
+license clauses&lt;/a&gt; prohibiting users to reverse engineer (for example
+to check the security) and benchmark it, and thus prefer to connect to
+Zoom meetings with free software clients.&lt;/p&gt;
+
+&lt;p&gt;Jami worked OK as a SIP client to Zoom as long as there was no
+password set on the room.  The Jami daemon leak memory like crazy
+(approximately 1 GiB a minute) when I am connected to the video
+conference, so I had to restart the client every 7-10 minutes, which
+is not a great.  I tried to get other SIP Linux clients to work
+without success, so I decided I would have to live with this wart
+until someone managed to fix the leak in the dring code base.  But
+another problem showed up once the rooms were password protected.  I
+could not get my dial tone signaling through from Jami to Zoom, and
+dial tone signaling is used to enter the password when connecting to
+Zoom.  I tried a lot of different permutations with my Jami and
+Asterisk setup to try to figure out why the signaling did not get
+through, only to finally discover that the fundamental problem seem to
+be that Zoom is simply not able to receive dial tone signaling when
+connecting via SIP.  There seem to be nothing wrong with the Jami and
+Asterisk end, it is simply broken in the Zoom end.  I got help from a
+very skilled VoIP engineer figuring out this last part.  And being a
+very skilled engineer, he was also able to locate a solution for me.
+Or to be exact, a workaround that solve my initial problem of
+connecting to password protected Zoom rooms using Jami.&lt;/p&gt;
+
+&lt;p&gt;So, how do you do this, I am sure you are wondering by now.  The
+trick is already
+&lt;a href=&quot;https://support.zoom.us/hc/en-us/articles/202405539-H-323-SIP-Room-Connector-Dial-Strings#sip&quot;&gt;documented
+from Zoom&lt;/a&gt;, and it is to modify the SIP address to include the room
+password.  What is most surprising about this is that the
+automatically generated email from Zoom with instructions on how to
+connect via SIP do not mention this.  The SIP address to use normally
+consist of the room ID (a number), an @ character and the IP address
+of the Zoom SIP gateway.  But Zoom understand a lot more than just the
+room ID in front of the at sign.  The format is &quot;&lt;tt&gt;[Meeting
+ID].[Password].[Layout].[Host Key]&lt;/tt&gt;&quot;, and you can hear see how you
+can both enter password, control the layout (full screen, active
+presence and gallery) and specify the host key to start the meeting.
+The full SIP address entered into Jami to provide the password will
+then look like this (all using made up numbers):&lt;/p&gt;
+
+&lt;p&gt;&lt;blockquote&gt;
+&lt;tt&gt;sip:657837644.522827@192.168.169.170&lt;/tt&gt;
+&lt;/blockquote&gt;&lt;/p&gt;
+
+&lt;p&gt;Now if only jami would reduce its memory usage, I could even
+recommend this setup to others. :)&lt;/p&gt;
+
+&lt;p&gt;As usual, if you use Bitcoin and want to show your support of my
+activities, please send Bitcoin donations to my address
+&lt;b&gt;&lt;a href=&quot;bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b&quot;&gt;15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b&lt;/a&gt;&lt;/b&gt;.&lt;/p&gt;
+</description>
+       </item>
+       
+       <item>
+               <title>GnuCOBOL, a free platform to learn and use COBOL - nice free software</title>
+               <link>http://people.skolelinux.org/pere/blog/GnuCOBOL__a_free_platform_to_learn_and_use_COBOL___nice_free_software.html</link>
+               <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/GnuCOBOL__a_free_platform_to_learn_and_use_COBOL___nice_free_software.html</guid>
+                <pubDate>Wed, 29 Apr 2020 13:10:00 +0200</pubDate>
+               <description>&lt;p&gt;The curiosity got the better of me when
+&lt;a href=&quot;https://developers.slashdot.org/story/20/04/06/1424246/new-jersey-desperately-needs-cobol-programmers&quot;&gt;Slashdot
+reported&lt;/a&gt; that New Jersey was desperately looking for
+&lt;a href=&quot;https://en.wikipedia.org/wiki/COBOL&quot;&gt;COBOL&lt;/a&gt; programmers,
+and a few days later it was reported that
+&lt;a href=&quot;https://onezero.medium.com/ibm-rallies-cobol-engineers-to-save-overloaded-unemployment-systems-eeadf13eddce&quot;&gt;IBM
+tried to locate COBOL programmers&lt;/a&gt;.&lt;/p&gt;
+
+&lt;p&gt;I thus decided to have a look at free software alternatives to
+learn COBOL, and had the pleasure to find
+&lt;a href=&quot;https://sourceforge.net/projects/open-cobol/&quot;&gt;GnuCOBOL&lt;/a&gt; was
+already &lt;a href=&quot;https://tracker.debian.org/pkg/gnucobol&quot;&gt;in
+Debian&lt;/a&gt;.  It used to be called Open Cobol, and is a &quot;compiler&quot;
+transforming COBOL code to C or C++ before giving it to GCC or Visual
+Studio to build binaries.&lt;/p&gt;
+
+&lt;p&gt;I managed to get in touch with upstream, and was impressed with the
+quick response, and also was happy to see a new Debian maintainer
+taking over when the original one recently asked to be replaced.  A
+new Debian upload was done as recently as yesterday.&lt;/p&gt;
+
+&lt;p&gt;Using the Debian package, I was able to follow a simple COBOL
+introduction and make and run simple COBOL programs.  It was fun to
+learn a new programming language.  If you want to test for yourself,
+&lt;a href=&quot;https://en.wikipedia.org/wiki/GnuCOBOL&quot;&gt;the GnuCOBOL Wikipedia
+page&lt;/a&gt; have a few simple examples to get you startet.&lt;/p&gt;
+
+&lt;p&gt;As I do not have much experience with COBOL, I do not know how
+standard compliant it is, but it claim to pass most tests from COBOL
+test suite, which sound good to me.  It is nice to know it is possible
+to learn COBOL using software without any usage restrictions, and I am
+very happy such nice free software project as this is available.  If
+you as me is curious about COBOL, check it out.&lt;/p&gt;
+
+&lt;p&gt;As usual, if you use Bitcoin and want to show your support of my
+activities, please send Bitcoin donations to my address
+&lt;b&gt;&lt;a href=&quot;bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b&quot;&gt;15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b&lt;/a&gt;&lt;/b&gt;.&lt;/p&gt;
+</description>
+       </item>
+       

        <item>
                <title>Totalovervåkning av innbyggernes bevegelser - nei takk!</title>
                <link>http://people.skolelinux.org/pere/blog/Totaloverv_kning_av_innbyggernes_bevegelser___nei_takk_.html</link>
        <item>
                <title>Totalovervåkning av innbyggernes bevegelser - nei takk!</title>
                <link>http://people.skolelinux.org/pere/blog/Totaloverv_kning_av_innbyggernes_bevegelser___nei_takk_.html</link>


@@ -18,9 +133,9 @@ regjeringen om konsekvenser hvis befolkningen ikke tar den i bruk.
 Rekker ikke skrive noe fyldig om temaet, men det er klart for meg at
 den utraderer retten til privatliv samt utgjør en personlig
 sikkerhetsrisiko for alle som tar den i bruk.  Bare det er nok til at
 Rekker ikke skrive noe fyldig om temaet, men det er klart for meg at
 den utraderer retten til privatliv samt utgjør en personlig
 sikkerhetsrisiko for alle som tar den i bruk.  Bare det er nok til at

-det fremstår som en svert dårlig ide å bli med på denne &quot;dugnaden&quot;.
+det fremstår som en svært dårlig ide å bli med på denne &quot;dugnaden&quot;.

 Det finnes andre og bedre tilnærminger enn den valgt av FHI.  Har de
 Det finnes andre og bedre tilnærminger enn den valgt av FHI.  Har de

-valgt den for å sikre seg nok et datasett i den fremtidige
+valgt sin tilnærming for å sikre seg nok et datasett i den fremtidige

 ehelse-portalen?  Potensialet for misbruk av informasjon samlet inn av
 appen er for stort, effekten på neste krise for klar og gevinsten for
 liten.&lt;/p&gt;
 ehelse-portalen?  Potensialet for misbruk av informasjon samlet inn av
 appen er for stort, effekten på neste krise for klar og gevinsten for
 liten.&lt;/p&gt;


@@ -190,8 +305,8 @@ start working, but you can have a look at the LaTeX originals here.&lt;/p&gt;
 &lt;p&gt;The first article is
 &quot;&lt;a href=&quot;http://people.skolelinux.org/pere/blog/images/2020-02-25-rmj-iot-record-keeping.pdf&quot;&gt;A
 record-keeping approach to managing IoT-data for government
 &lt;p&gt;The first article is
 &quot;&lt;a href=&quot;http://people.skolelinux.org/pere/blog/images/2020-02-25-rmj-iot-record-keeping.pdf&quot;&gt;A
 record-keeping approach to managing IoT-data for government

-agencies&lt;/a&gt;&quot; (&lt;a href=&quot;https://doi.org/10.1108/RMJ-09-2019-0056&quot;&gt;DOI
-10.1108/RMJ-09-2019-0056&lt;/a&gt;) by Thomas Sødring, Petter Reinholdtsen
+agencies&lt;/a&gt;&quot; (&lt;a href=&quot;https://doi.org/10.1108/RMJ-09-2019-0050&quot;&gt;DOI
+10.1108/RMJ-09-2019-0050&lt;a/&gt;) by Thomas Sødring, Petter Reinholdtsen

 and David Massey, and sketches some approaches for storing measurement
 data (aka Internet of Things sensor data) in a archive, thus providing
 a well defined mechanism for screening and deletion of the information &lt;/p&gt;
 and David Massey, and sketches some approaches for storing measurement
 data (aka Internet of Things sensor data) in a archive, thus providing
 a well defined mechanism for screening and deletion of the information &lt;/p&gt;


@@ -199,8 +314,8 @@ a well defined mechanism for screening and deletion of the information &lt;/p&gt
 &lt;p&gt;The second article is
 &quot;&lt;a href=&quot;http://people.skolelinux.org/pere/blog/images/2020-02-25-rmj-block-chain-record-keeping.pdf&quot;&gt;Publishing
 and using record-keeping structural information in a blockchain&lt;/a&gt;&quot;
 &lt;p&gt;The second article is
 &quot;&lt;a href=&quot;http://people.skolelinux.org/pere/blog/images/2020-02-25-rmj-block-chain-record-keeping.pdf&quot;&gt;Publishing
 and using record-keeping structural information in a blockchain&lt;/a&gt;&quot;

-(&lt;a href=&quot;https://doi.org/10.1108/RMJ-09-2019-0050&quot;&gt;DOI
-10.1108/RMJ-09-2019-0050&lt;a/&gt;) by Thomas Sødring, Petter Reinholdtsen
+(&lt;a href=&quot;https://doi.org/10.1108/RMJ-09-2019-0056&quot;&gt;DOI
+10.1108/RMJ-09-2019-0056&lt;/a&gt;) by Thomas Sødring, Petter Reinholdtsen

 and Svein Ølnes, where we describe a way for third parties to validate
 authenticity and thus improve trust in the records kept in a
 archive.&lt;/p&gt;
 and Svein Ølnes, where we describe a way for third parties to validate
 authenticity and thus improve trust in the records kept in a
 archive.&lt;/p&gt;


@@ -208,6 +323,9 @@ archive.&lt;/p&gt;
 &lt;p&gt;As usual, if you use Bitcoin and want to show your support of my
 activities, please send Bitcoin donations to my address
 &lt;b&gt;&lt;a href=&quot;bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b&quot;&gt;15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b&lt;/a&gt;&lt;/b&gt;.&lt;/p&gt;
 &lt;p&gt;As usual, if you use Bitcoin and want to show your support of my
 activities, please send Bitcoin donations to my address
 &lt;b&gt;&lt;a href=&quot;bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b&quot;&gt;15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b&lt;/a&gt;&lt;/b&gt;.&lt;/p&gt;

+
+&lt;p&gt;&lt;strong&gt;Update 2020-04-26&lt;/strong&gt;: Initially managed to swap the
+DOI numbers.  Fixed it.&lt;/p&gt;

 </description>
        </item>
        
 </description>
        </item>
        


@@ -359,110 +477,5 @@ Merk, betaling med bitcoin er ikke anonymt. :)&lt;/p&gt;
 </description>
        </item>
        
 </description>
        </item>
        

-       <item>
-               <title>When terms and policy turn users away</title>
-               <link>http://people.skolelinux.org/pere/blog/When_terms_and_policy_turn_users_away.html</link>
-               <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/When_terms_and_policy_turn_users_away.html</guid>
-                <pubDate>Sat, 7 Dec 2019 21:15:00 +0100</pubDate>
-               <description>&lt;p&gt;When asked to accept terms of use and privacy policies that state
-it will to remove rights I otherwise had or accept unreasonable terms
-undermining my privacy, I choose away the service.  I simply do not
-have the conscience to accept terms I have no indention of upholding.
-But how are the system and service providers to know how many people
-they scared away?  Normally I just quietly walk away.  But today, I
-tried a new approach.  I sent the following email (removing the
-specifics, as I am not out to take the specific service in question)
-to the service provider I decided to not use, to at least give them
-one data point on how many users are unhappy with their terms:&lt;/p&gt;
-
-&lt;blockquote&gt;
-From: Petter Reinholdtsen
-&lt;br&gt;Subject: When terms of use turn users away
-&lt;br&gt;To: [contact@some.site]
-&lt;br&gt;Date: Sat, 07 Dec 2019 16:30:56 +0100
-
-&lt;p&gt;Dear [Site Owner],&lt;/p&gt;
-
-&lt;p&gt;I was eager to test the system, as it seemed like a fun and
-interesting application of [some] technology, but after reading the
-terms of use and privacy policy on &amp;lt;URL:
-https://www.[some.site]/terms-of-use &amp;gt; and &amp;lt;URL:
-https://www.[some.site]/privacy-policy &amp;gt; I want you to know that I
-decided to turn away.  There were several provisions in the terms and
-policy turning me off, but the final term that convinced me was being
-asked to sign away my right to reverse engineer.&lt;/p&gt;
-
-&lt;p&gt;-- 
-&lt;br&gt;Happy hacking
-&lt;br&gt;Petter Reinholdtsen&lt;/p&gt;
-&lt;/blockquote&gt;
-
-&lt;p&gt;I do not expect much to come out of it, but sharing it here in case
-others want to give something similar a try too.  If companies
-discover their terms scare away enough people, perhaps they will be
-improved...&lt;/p&gt;
-
-&lt;p&gt;As usual, if you use Bitcoin and want to show your support of my
-activities, please send Bitcoin donations to my address
-&lt;b&gt;&lt;a href=&quot;bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b&quot;&gt;15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b&lt;/a&gt;&lt;/b&gt;.&lt;/p&gt;
-</description>
-       </item>
-       
-       <item>
-               <title>What would it cost to store all 2018 phone calls in Norway?</title>
-               <link>http://people.skolelinux.org/pere/blog/What_would_it_cost_to_store_all_2018_phone_calls_in_Norway_.html</link>
-               <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/What_would_it_cost_to_store_all_2018_phone_calls_in_Norway_.html</guid>
-                <pubDate>Mon, 25 Nov 2019 20:15:00 +0100</pubDate>
-               <description>&lt;p&gt;Four years ago, I did a back of the envelope calculation on
-&lt;a href=&quot;http://people.skolelinux.org/pere/blog/What_would_it_cost_to_store_all_phone_calls_in_Norway_.html&quot;&gt;how
-much it would cost to store audio recordings of all the phone calls in
-Norway&lt;/a&gt;, and came up with NOK 2.1 million / EUR 250 000 for the
-year 2013.  It is time to repeat the calculation using updated
-numbers.  The calculation is based on how much data storage is needed
-for each minute of audio, how many minutes all the calls in Norway
-sums up to, multiplied by the cost of data storage.&lt;/p&gt;
-
-&lt;p&gt;The number of phone call minutes for 2018 was fetched from
-&lt;a href=&quot;https://ekomstatistikken.nkom.no/&quot;&gt;the NKOM statistics
-site&lt;/a&gt;, and for 2018, land line calls are listed as 434 238 000
-minutes, while mobile phone calls are listed with 7 542 006 000
-minutes.  The total number of minutes is thus 7 976 244 000.  For
-simplicity, I decided to ignore any advantages in audio compression the
-last four years, and continue to assume 60 Kbytes/min as the last
-time.&lt;/p&gt;
-
-&lt;p&gt;Storage prices still varies a lot, but as last time, I decide to
-take a reasonable big and cheap hard drive, and double its price to
-include the surrounding costs into account.  A 10 TB disk cost less
-than 4500 NOK / 450 EUR these days, and doubling it give 9000 NOK per
-10 TB.&lt;/p&gt;
-
-&lt;p&gt;So, with the parameters in place, lets update the old table
-estimating cost for calls in a given year:&lt;/p&gt;
-
-&lt;table border=&quot;1&quot;&gt;
-&lt;tr&gt;&lt;th&gt;Year&lt;/th&gt;&lt;th&gt;Call minutes&lt;/th&gt;&lt;th&gt;Size&lt;/th&gt;&lt;th&gt;Price in NOK / EUR&lt;/th&gt;&lt;/tr&gt;
-&lt;tr&gt;&lt;td&gt;2005&lt;/td&gt;&lt;td align=&quot;right&quot;&gt;24 000 000 000&lt;/td&gt;&lt;td align=&quot;right&quot;&gt;1.3 PiB&lt;/td&gt;&lt;td align=&quot;right&quot;&gt;1 170 000 / 117 000&lt;/td&gt;&lt;/tr&gt;
-
-&lt;tr&gt;&lt;td&gt;2012&lt;/td&gt;&lt;td align=&quot;right&quot;&gt;18 000 000 000&lt;/td&gt;&lt;td align=&quot;right&quot;&gt;1.0 PiB&lt;/td&gt;&lt;td align=&quot;right&quot;&gt;900 000 / 90 000&lt;/td&gt;&lt;/tr&gt;
-
-&lt;tr&gt;&lt;td&gt;2013&lt;/td&gt;&lt;td align=&quot;right&quot;&gt;17 000 000 000&lt;/td&gt;&lt;td align=&quot;right&quot;&gt;950 TiB&lt;/td&gt;&lt;td align=&quot;right&quot;&gt;855 000 / 85 500&lt;/td&gt;&lt;/tr&gt;
-
-&lt;tr&gt;&lt;td&gt;2018&lt;/td&gt;&lt;td align=&quot;right&quot;&gt;7 976 244 000&lt;/td&gt;&lt;td align=&quot;right&quot;&gt;445 TiB&lt;/td&gt;&lt;td align=&quot;right&quot;&gt;401 100 / 40 110&lt;/td&gt;&lt;/tr&gt;
-&lt;/table&gt;
-
-&lt;p&gt;Both the cost of storage and the number of phone call minutes have
-dropped since the last time, bringing the cost down to a level where I
-guess even small organizations can afford to store the audio recording
-from every phone call taken in a year in Norway.  Of course, this is
-just the cost of buying the storage equipment.  Maintenance, need to
-be included as well, but the volume of a single year is about a single
-rack of hard drives, so it is not much more than I could fit in my own
-home.  Wonder how much the electricity bill would raise if I had that
-kind of storage?  I doubt it would be more than a few tens of thousand
-NOK per year.&lt;/p&gt;
-</description>
-       </item>
-       

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