Category: Hacking

Android won’t connect to Wifi

Since Android has a Linux-based kernel, the Wifi interface is managed by the wpa_supplicant as on most Unix-based systems. My personal experience during the last years of using wpa_supplicant is that there are many times troubles with it which are hard to debug and even sometimes not reproducable. On the other hand it often works …

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Android, CyanogenMod, and OpenVPN

Although I followed the instructions about how to configure OpenVPN with Cyanogen I failed at first because the certificate “installation” is not what I call user-friendly (Why not simply copy the certificate file to the right location?). OpenVPN is a very secure and feature-rich OpenSource VPN solution. If you Google for it you will find …

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Disable Shutter Sound on Xperia X8

Since several months I use a Sony Ericsson Xperia X8 smart phone. The device is really handy because it is small and fits easily into every pocket but offers all features of a smart phone. By default it comes with Android 2.1 and SE discontinued to offer newer versions. I rooted the device and upgraded …

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Twitter and Content-sensitive Filtering

Originally I intentend to give this post the title “Twitter and Censorship” but then I decided to rename it since censorship is a very hard word. Of course, censorship and filtering are related to each other. But read on about my discovery. At first, I thought it is some kind of network failure, server overload, …

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Mastercard, Visa & Amazon Phishing

Es ist schon einige Monate her, seitdem wir im Rahmen eines Kurses auf der FH St. P├Âlten in die “Geheimnisse von SMTP & Co” eingetaucht sind. Ich habe dabei auch versucht die Teilnehmer des Kurses zu animieren ihren Spam zu “lesen” ­čśë …nat├╝rlich nicht um danach selbst Opfer einer Phishing-Attacke o.├Ą. zu werden, sondern um …

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Bei A1 ist Security noch nicht angekommen

Bei A1 ist der Begriff Security noch nicht angekommen. Durch Zufall kam ich k├╝rzlich bei einem Kunden mit dem A1 Webspace Business in Ber├╝hrung. Im Produktnamen ist der Begriff Business zu finden, was darauf schlie├čen l├Ąsst, dass es sich eben um ein Profiprodukt handelt. Aber was genau zeichnet es aus? Gute Frage, denn der Webspace …

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RF_KILL sucks!

This is not the first time that I have troubles with the RF-kill “feature” as reported on this blog. Recently I set up an old notebook. I did a clean Linux network install of Debian Lenny. Everything worked fine, all hardware was detected properly. But it took not long to find out that the wifi …

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Pdflatex does not compile Beamer class documents

For several years now I use the Beamer class to create slides with Latex. For whatever reason pdflatex does not compile my Latex documents anymore. It stops with the following error message: ! Undefined control sequence. \Gm@lmargin ->\Geom@lmargin I found out that this seems to be caused by an update of the geometry package. The …

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Configuring a WordPress Network (without login loop)

Using a WordPress network seems to be interesting as soon as you run multiple WordPress instances on different domain names. You can safe a lot of work using a network installation because you have to maintain just one software installation. That’s what we did here. There is a great page with configuration instructions found here. …

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Annoying RF_KILL on HP/Compaq 2510p

Yesterday I tried to connect an old notebook which has no Wifi adapter to the Internet through my HP 2510p. Usually not a big deal; connect through an Ethernet cable, configure IP addresses on both sides, enable packet forwarding and configure an iptables masquerading rule. But it didn’t work. As soon as I connected the …

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