All posts by apfelkraut

HowTo: Installing Yosemite into VirtualBox

This post should give a quick overview and some background on how to install Mac OS X 10.10 Yosemite in VirtualBox version 4.3.22.

VirtualBox is great because it is probably the only free and open source software based virtualization environment that supports most common platforms (like GNU/Linux, Windows, and Macintosh) and where the virtual machines are portable in case you want to switch the host’s operating system.

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We know who you are and what news you read

… and we only want to improve your site experience and provide you personalised offers of the stuff that you really need.

Right, this is not about the NSA or other mass data retention initiatives by federal governments to fight terrorism. It is just about the common tracking and advertising mechanisms that are embedded in nearly every Web site that you visit every day. It is not only tracked what exactly you read, but also recorded where you went next and when you came back. And this is then aggregated into a quite personal profile of yourself and commercially exploited to offer you the best surfing and shopping experience. So to say Big Data at its best.

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Email encryption

As more and more people want to encrypt their personal communication to preserve and to protect their privacy, this post should give a quick introduction and some useful hints regarding email encryption based on OpenPGP.

First of all: It may initially look like being quite complicated. The available guide will require some thorough reading. But in the end it is not that complex and absolutely worth the effort. As soon as one is familiar with the basic concepts and techniques it will be nothing more than locking/unlocking your front door. And probably you did not yet remove your door lock for reasons of simplicity?

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#CharlieHebdo – Eine selektive Meinungs- und Presseschau

Die Anschläge in Paris wurden in den vergangenen Tagen in aller Ausführlichkeit und aus unterschiedlichsten Perspektiven analysiert, diskutiert und verurteilt. Im nun folgenden Diskurs zur Bedeutung für unsere Gesellschaft sollten die nachfolgenden Aspekte nicht zu kurz kommen.

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“Wir lieben Überwachung”

Erinnert sich noch jemand an das Video “Du bist Terrorist” von 2009? Darin hat Alexander Lehmann die drohende Gefahr durch eine Vorratsdatenspeicherung überzeugend animiert. Die große Angst war damals, dass man durch die geplante Einführung der Vorratsdatenspeicherung in Deutschland früher oder später in einem Überwachungsstaat leben könnte.

Wie jeder spätestens seit Snowden weiß, sind wir heute bereits deutlich weiter. Aus diesem Grund mit passendem Titel “Wir lieben Überwachung” das neueste Video von Alexander Lehmann:

Ihr liebt sie doch auch?!

[via CCC, English version of video]

Bezüglich angeblicher “Islamisierung”

Manch anderem besorgtem Bewohner des Abendlandes mag die aktuelle Entwicklung langsam wie eine Wiederholung der Vergangenheit erscheinen. Aus diesem Grund soll an dieser Stelle ein bereits vor sieben Jahren verbloggtes Video ebenfalls wiederholt werden.

Aktueller denn je ist Hagen Rethers Jahresrückblick aus der „Scheibenwischer“ von 2007:

Sehr traurig, dass mittlerweile die Stimmungsmache nicht mehr nur durch die Medien, sondern auch durch angebliche Teile der Gesellschaft erfolgt.

Automatically generating image galleries based on

As you might have noticed all image galleries of this blog are meanwhile based on the framework. is great because it is Free/Libre Software (MIT-licensed), simply does what it is supposed to do, and requires not yet another plugin for WordPress nor a database backend. It also supports mobile devices and its typical touch gestures. Furthermore it enables self-hosted galleries and does not require to rely on any cloud services where you might loose control on your data.

The only thing that I was missing was a straight forward way to automatically generate a gallery. Creating it by hand – as for example described in’s “Beginners Guide” – is time-consuming, cumbersome, and error-prone. So the overall idea was to create a ready-to-run gallery based on a given folder that contains just the image files by using a shell script.

In detail I wanted to have the following functionality:
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