Licht, Light, Lumo

Gratis py2guile from Freenet

py2guile book

py2guile is a book I wrote about Python and Guile Scheme. It’s selling at 0.01 ฿ | 2.99 € for the ebook and 14.95 € for the printed softcover.

To fight the new german data retention laws, you can get the ebook gratis: Just install Freenet, then the following links work:

Escape total surveillance and get an ebook about the official GNU extension language for free today!

Bitte installiert Freenet, Deutschland hat seit 2015 Vorratsdatenspeicherung

Die Bundesregierung hat am 16.10.2015 die Vorratsdatenspeicherung durchgewunken, nachdem sie zwei Tage vorher die Opposition durch rechtswidrige1 Erweiterung der Tagesordnung am Vortag ausgebremst hat (was das Bundesverfassungsgericht vor nicht einmal einem Monat verboten hat).2 Auf irgendwelche Fairness der aktuellen Regierung, oder auch nur Einhaltung geltenden Rechts, können wir daher offensichtlich nicht mehr vertrauen,3 und es wird Zeit, technische Lösungen zu nutzen.

Um zu verhindern, dass all eure Kommunikationspartner verwertbar aufgezeichnet werden, installiert bitte Freenet.

→ Freenet installieren (Direktlink) ←


  1. Die Erweiterung am Vortag verletzt laut Halina Wawzyniak die Geschäftsordnung des Bundestages, die eine Information über die Tagesordnung 3 Tage vor der Sitzung vorschreibt. Erweiterungen sind nur zulässig, wenn keine einzige Fraktion widerspricht, doch die Linke und die Grünen haben widersprochen. Der Widerspruch der Opposition zur Erweiterung wurde von den Regierungsfraktionen widerrechtlich ignoriert

  2. »Es stellt daher eine Verletzung von Rechten eines Abgeordneten dar, wenn dieser erforderliche Informationen so spät erhält, dass er nicht mehr in der Lage ist, sich fundiert mit diesen zu befassen und sich vor der Beratung oder Abstimmung eine Meinung zu dem Vorgang zu bilden.« — Bundesverfassungsgericht, Urteil vom 22. September 2015 - 2 BvE 1/11, 111 

  3. Trotzdem ist die Verfassungsklage von Digital Courage gegen die Vorratsdatenspeicherung 2015 umso wichtiger: Wenn wir starke Mittel aufgeben, weil andere versuchen, sie zu entwerten, verlieren wir an Handlungsmöglichkeiten. 

BY-SA and GPL: creativecommons closed the chasm in the sharealike/copyleft community

This is the biggest news item for free culture and free software in the past 5 years: The creativecommons attribution sharealike license is now one-way compatible to the GPL — see the message from creativecommons and from the Free Software Foundation.

Some license compatibility legalese might sound small, but the impact of this is hard to overestimate.

Going from Python to Guile Scheme - a natural progression

py2guile book

Python is the first language I loved. I dreamt in Python, I planned in Python, I thought I would never need anything else.

 - Free: html | pdf
 - Ebook: 2.99 €
   epub format
 - Softcover: 14.95 €
   with pdf, epub, mobi
 - Source: download
   free licensed under GPL

follow the blue rabbit

========= blue-rabbit =========
follow the blue rabbit
through the looking glass
to find your real self
========= looking glass =========

Australia gets mandatory data retention

Australia gets mandatory data retention — with unchecked access by roughly any local or federal police agency and “Any other agency the Attorney General publicly declares”. (So much for separation of powers)

And they can use that in court.

→ » Australia: Now is the time to go dark « ←

Dear Australians: This is what we have been talking about the past 10 years. The tech for confidential communication might still be cumbersome to use, but you now need it.

If you want to use Freenet for that, I’ll gladly help you set it up.

IPCC bibtex entries

I repeatedly stumbled over needing bibtex entries for the IPCC reports. So I guess, others might stumble over that, too. Here I share my bibtex entries for some parts of the IPCC reports.1

IPCC 1990 WG1 (physical science basis)

  title = {Climate Change 1990 The Science of Climate Change},
  publisher = {The Intergovernmental Panel on Climate Change},
  year = {1996},
  editor = {J.T. Houghton and G.J. Jenkins and J.J. Ephraums},
  author = {IPCC Working Group I}

  1. In IPCC 2013 WG1 they finally provide bibtex in their zip of references, but without item headers — you can’t use these directly. 

Freenet as backing store for sites on the clearnet (in use today)

Chris Double (bluishcoder) changed his main website to be served directly from Freenet:

Thanks to this, the same article is now available from my inproxy.

And, naturally, from Freenet:


Information challenges for scientific publishing

On 2015-08-27, Researchers from the Reproducibility Project: Psychology reported that in 100 reproduction studies, only “47% of original effect sizes were in the 95% confidence interval of the replication effect size” (RPP SCIENCE 2015, an overview of the results is available in Scientific American; in german from DLF Forschung Aktuell).

I take this worrying result as cue to describe current challenges to scientific publishing and measures to address them — including reproduction experiments, and what to do if they contest previously published and referenced work.


PDF (to print)

Org (source)

Scientific publishing has come a long way since it’s beginning, and it’s principles have allowed it to scale up from a few hundred active scientists worldwide to conferences with tens of thousands of people for a given topic. But in the last few years it hit its limits. It becomes harder each year to keep up with the amount of new papers being published and even scientists from similar fields repeatedly reinvent the same methods. To scale further and to continue to connect the scientific community, it must adapt to make it easier to get an understanding of the current state of science and keep up to date with new findings.

To grow from these challenges, scientific publishing needs to

Freenet Communication Primitives: Part 2, Service Discovery and Communication

Basic building blocks for communication in Freenet.

This is a guide to using Freenet as backend for communication solutions - suitable for anything from filesharing over chat up to decentrally hosted game content like level-data. It uses the Python interface to Freenet for its examples.

Mirror, Freenet Project, Arne Babenhauserheide, GPL
Freenet Project,
License: GPL.

This guide consists of several installments: Part 1 is about exchanging data, Part 2 is about confidential communication and finding people and services without drowning in spam and Part 3 ties it all together by harnessing existing plugins which already include all the hard work which distinguishes a quick hack from a real-world system.

Note: You need the current release of pyFreenet for the examples in this article (0.3.2). Get it from PyPI:

# with setuptools
easy_install --user pyFreenet
# or pip
pip install --user --egg pyFreenet

This is part 2: Service Discovery and Communication. It shows how to find new people, build secure communication channels and create community forums. Back when I contributed to Gnutella, this was the holy grail of many p2p researchers (I still remember the service discovery papers). Here we’ll build it in 300 lines of Python.

Welcome to Freenet, where no one can watch you read!

Lohnsenkung im öffentlichen Dienst wegen leerer Kassen?

→ Antwort zum Kommentar „Leidtragenden des Streiks sind … die normalen Bürger“ zu ausgelaugte Gewerkschaft in der Taz.

Die öffentlichen Arbeitgeber schwimmen nicht im Geld, weil die Regierenden es nicht wagen, die Einnahmenseite zu erhöhen. Bei immer weiter steigenden Konzerngewinnen wird es Zeit, dass sich das ändert.

Arbeitslosengeld als „Erstattung“…

→ Kommentar zum Kommentar „kriegen Leute mit ALG2 … "erstattet"“ in der Taz.

ALG2 ist keine Erstattung.


For or about scientific work.

Surface Area of regions on an ellipsoid Earth


PDF (to print)

Org (source)

Data (netCDF4)

Calculating the area of arbitrary regions on the Earth approximated as an ellipsoid. I needed this for conversion between the output of different models.

It’s calculated in Emacs Lisp, which showed me that for somewhat complex mathematical tasks Lisp syntax isn’t only unproblematic, but actually helps avoiding mistakes. And full unicode support is great for implementing algorithms with ω, λ and φ.


My server was breached - sorry for the downtime

After 4 weeks of downtime my sites are online again.

Freenet Communication Primitives: Part 1, Files and Sites

Basic building blocks for communication in Freenet.

This is a guide to using Freenet as backend for communication solutions - suitable for anything from filesharing over chat up to decentrally hosted game content like level-data. It uses the Python interface to Freenet for its examples.

TheTim from Tim Moore, licensed under cc by
from Tim Moore,
License: cc by.

This guide consists of several installments: Part 1 (this text) is about exchanging data, Part 2 is about confidential communication and finding people and services without drowning in spam and Part 3 ties it all together by harnessing existing plugins which already include all the hard work which distinguishes a quick hack from a real-world system. Happy Hacking and welcome to Freenet, the forgotten cypherpunk paradise where no one can watch you read!

IT des Deutschen Bundestages fremdkontrolliert. Oppositionsabgeordnete ratlos.

Diese Aussage trifft gerade die Grünen-AbgeordneteTabea Rößner in der FAZ. Ich wollte das nur auf G+ weitergeben, als mich meine eigenen Worte wie ein Schlag getroffen haben:

IT des Deutschen Bundestages fremdkontrolliert. Oppositionsabgeordnete ratlos.

Verdammt, in welcher Welt leben wir? Ist das ein Agententhriller oder düstere Science Fiction? So eine Titelzeile würde in Star Wars passen, als Zeitungsmeldung während der Imperator den Senat übernimmt.

concise commit messages

Written in the discussion about a pull request for Freenet.

When I look up a commit, I’m not searching for prose. I’m searching for short snippets of information I need. If they are long-winded explanations, I am unlikely to even read them.

To understand this, please imagine coming back home, getting off the bike and taking 15 minutes to look at the most recent pull-request.

Vortrag: SUMA-Award für das Freenet-Projekt (Video)

Mein Vortrag beginnt bei 5:56.

Transkript / Untertitel

Ich bin dabei, den Text zu transkribieren, aber es wird noch etwas dauern, bis ich fertig bin. Sobald ich fertig bin, gibt es das als Untertitel-Datei. Was ich bisher habe als Text:

Mit Freenet sicher kommunizieren

Kannst du in wenigen Worten beschreiben, warum mit Freenet sicher zu kommunizieren ist?
— Falk Flak

Bei Freenet gibt es zwei Arten sicher zu kommunizieren:

  1. Du kannst dir ein Pseudonym erschaffen, unter dem du in Freenet-Internen Foren schreiben und anderen Nutzern anonyme, aber spamgeschützte E-Mails schreiben kannst. Die Daten werden dafür direkt zwischen Freenet Nutzenden über mehrere Schritte ausgetauscht, es gibt also keinen zentral kontrollierten Server. Du kannst Daten hochladen, die auch dann noch verfügbar sind, wenn du offline bist, aber nur für diejenigen, denen du den Link dazu gegeben hast.

  2. Du verbindest dich direkt mit Freunden. Von außen kann sichtbar sein, dass ihr euch kennt, aber nicht wann und über was ihr redet. Die Daten, die Freenet für den Normalbetrieb austauscht, sehen genauso aus wie Kommunikation zwischen dir und deinen Freunden, verdecken sie also.

Eine kurze Präsentation dazu: Freenet Nutzen: Technische Lösungen für freie Kommunikation im Internet

Es gibt auch einen längeren Vortrag zu Freenet aus der Chaotischen Viertelstunde bei Noname e.V.:

Hitchhikers Guide on Towels - Read from Space

Samantha Cristoforetti reads the Hitchhikers Guide to the Galaxy on the International Space Station

This is the world we live in: The Hitchhikers Guide read from Space.

If you don’t get goosebumps just thinking about it, envision it again: The old visions are becoming real step by step, and now those who actually venture in space read the works of visionaries from their temporary home beyond the atmosphere.

New traditions form from a reality which still seems

Secure communication with GnuPG and E-Mail

How E-Mail with GnuPG could hide when you talk, where you talk from and what you talk about.

or in technical terms:

E-Mail with perfect forward security, hidden subject and masked date using GnuPG and better frontends.

If you regularly read my articles, you’ll know that I’m a proponent of connecting over Freenet to regain confidential and pseudonymous communication.

Here I want to show how it would be possible to use E-Mail with GnuPG to get close to the confidentiality of Freenet friend-to-friend communication, because we have the tech (among the most heavily scrutinized and well-tested technology we use today) and we have the infrastructure. All it requires are more intelligent E-Mail clients. Better UI which makes the right thing easy.

Wir passen aufeinander auf (Menschen sind toll!)

Ich bin heute früh mit dem Rad zum Finanzamt, um die Steuererklärung abzugeben, und dann weiter zur Arbeit. Nach gut 15 km Fahrt wurde ich müde und entschied, eine Pause zu machen. Die Sonne schien und die Luft war angenehm kühl also legte ich meine Jacke hinter das Rad, hängte den Helm an den Lenker und legte mich auf den Radweg neben der Straße.

Nach zwei Minuten hörte ich einen Radler. Er fragte mich mit Osteuropäischem Akzent: „Ist alles OK?“. Ich antwortete „Alles OK, ich mache nur Pause.

Real Life Infocalypse

Freenet Logo: Follow the Rabbit DVCS in the Darknet. The decentralized p2p code repository.

In this guide I show by example how you can use the Infocalypse plugin for distributed development without central point of failure or reliance on unfree tools.12

If you think “I have no idea what this tool is for”: Infocalypse gives you fully decentralized Github with real anonymity, using only free software.

# freenet -> local
hg clone freenet://ArneBab/life-repo
# local -> freenet
hg clone life-repo real-life
hg clone real-life freenet://ArneBab/real-life
# send pull request
cd real-life
hg fn-pull-request --wot ArneBab/life-repo
(enter message)
# check for pull-requests
cd ../life-repo
sleep 1800 # (wait for confidential delivery)
hg fn-check-notifications --wot ArneBab

If you like this, please don’t only click like or +1, but share it with everyone who could be interested. The one who knows best how to reach your friends is you — and that’s how it should be.

  1. This guide shows the convenient way of working which has a higher barrier of entry. It uses WoT Pseudonyms to allow you to insert repositories by Pseudonym and repository name. If you can cope with inserting by private key and sending pull-requests manually, you can use it without the WoT, too, which reduces the setup effort quite a bit. Just skip the setup of the Web of Trust and Freemail and plugins. You can then clone the life repo via hg clone freenet://USK@6~ZDYdvAgMoUfG6M5Kwi7SQqyS-gTcyFeaNN1Pf3FvY,OSOT4OEeg4xyYnwcGECZUX6~lnmYrZsz05Km7G7bvOQ,AQACAAE/life-repo.R1/4 life-repo. See hg fn-genkey and hg help infocalypse for details. 

  2. Infocalypse shows one of many really interesting possibilities offered by Freenet. To get a feeling of how much more is possible, have a look at The Forgotten Cryptopunk Paradise

Strong Kerrigan

When you win Starcraft 2 Heart of the Swarm in brutal difficulty without losing Kerrigan even once, you get an ending with a truly strong Kerrigan.234

Clearly you are my greatest failure. Now at long last, you will die.

Again Mengsk activates the Xel'Naga artifact. As the lightning from the artifact tears at her flesh and cracks every part of her body, Kerrigan rasps an answer:

  1. The epub icon was created by the Oxygen Team ( and is licensed under the GNU LGPL

  2. This is what I’d have wished to see. 

  3. All characters in this story belong to Blizzard. I also published this story in the Starcraft forums

  4. The one thing I resent about Kerrigan in Starcraft 2 is that they made her weak.

    In SC1 Kerrigan embraced and ruled the swarm. She started as strong terran, never to let anyone talk down to her, never afraid to say what she wanted. Then she got infested, and she prevailed over the infestation, becoming the queen of blades, ruling the Zerg instead of being ruled by the Overmind.

    In the cutscenes of SC2 she’s a helpless wreck, ever reliant upon the help of others and exposed as a tool of the overmind to free the swarm from Amon.

    It feels as if someone wrote the story to deconstruct the legend of the queen of blades. The in-game story seems much better, though. 

power and deception

A religious leader is nothing more than a media-star who managed to convince people that the tale, in which he or she is special, is actually true.

Just like aristocrats managed to convince people that what their ancestors did gives them the right to control the lives of other people.

And like the rich convince people that money gives them the right to control a larger part of the world than others.

Simple daemon with start-stop-daemon and runit


PDF (to print)

Org (source)

Creating a daemon with almost zero effort.

Zeitungen exklusiv bei Facebook - Idiotie ohne Ende

→ Kommentar zum Artikel Rettet uns Facebook? (Journalismus in Online-Netzwerken), in dem Daniel Kretschmar in der Taz die These aufstellt, es sei wegen dem Versagen der Verlage, digital Geld zu verdienen, zu begrüßen, wenn bei exklusivem Vertrieb über Facebook „am Ende ein paar Brotsamen für die Inhalteproduzenten abfallen mögen“.

Was machen die Zeitungsverlage, wenn Facebook selbst Journalisten einstellt - so wie Amazon zum Buchhändler wurde?

Freenet protects your DickPic!

Afraid that the NSA could steal your DickPic? Freenet to the rescue!

Freenet protects your DickPic!
(mirror via Freenet)

My Top 20 most popular articles as of 2015

I asked myself: Are the most popular articles on my site the ones I like best?

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