Raspberry Pi Home Server
This year’s project during xmas vacation was to replace the old Raspberry Pi 1 by a new Raspberry Pi 3 with the official touch display and to increase the functional range.
Blog
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E-Banking in Österreich: Status quo zu TLS & DNSSEC
Nach etwas mehr als einem Jahr werfen wir erneut einen Blick auf die Sicherheit von E-Banking Internetseiten österreichischer Kreditinstitute in Bezug auf das SSL-Setup und dem Einsatz von DNSSEC.
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Steuerreform 2015: Lohnsteuer
Vor wenigen Tagen wurde das Lohnsteuermodell vorgestellt, auf das sich SPÖ und ÖVP geeinigt haben. Im Folgendem wird illustriert, wie sich das Reformmodell vom bisherigen Modell und den ursprünglichen Vorschlägen von SPÖ und ÖVP unterscheidet.
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Lohnsteuermodelle der SPÖ und ÖVP im Vergleich
SPÖ und ÖVP haben im Dezember des vergangenen Jahres deren Modellvorschläge für eine Anpassung der Lohnsteuer veröffentlicht. Hier ist der Versuch einer einfachen vergleichenden Analyse.
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Plots of the data of the SoCG-ACM voting
Jeff Erickson organized the recent vote for the computational geometry community to decide whether the Symposium on Computational Geometry (SoCG) should stay with ACM or whether it should be organized independently. In addition to asking whether to stay with or leave ACM, he also asked whether one is willing to help organizing SoCG. A few days ago, he presented interesting numerical data of this vote, grouped by country and affiliation of the voters. In the following we present plots from this data.
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Cryptographic setups of e-banking websites in Austria
E-banking users rely fundamentally on the security level established by HTTPS connections between their browser and the web server. The actual level of security depends on the proper setup of multiple cryptographic components. In this little survey, we have a look on the different settings of e-banking websites of various banks in Austria.
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Video surveillance registrations in Austria
Austrian law requires private video surveillance to be registered at the so-called data processing register. Since September 2012 public, anonymous online access is provided to this register. I wrote a little program that requests all datasets from this database and allows one to gain interesting statistical insight into video surveillance registrations in Austria. In particular, I created maps of all video surveillance registrations in Austria.
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Insecure DNS for internet banking
The Internet’s domain name service (DNS) was originally designed three decades ago. Back then no security mechanism were included into the specification of DNS, which would guarantee the authenticity of DNS query responses. This deficiency is exploited by widely known DNS cache poisoning and DNS hijacking attacks. DNSSEC is a security extension to DNS, which uses cryptographic signatures in oder to protect against forged DNS data.
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Voronoi diagram of a convex polyhedron
In this little blog article, we will show how the Voronoi diagram of a convex polyhedron
in 
-dimensional Euclidean space can be computed in
time. As the attentive reader
might guess by the time complexity, this is done by intersecting 
half-spaces in 
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Brutto- und Netto-Gehälter
Zu welchem Netto-Zuverdienst führt eine Brutto-Gehaltserhöhung? Steigt das Netto-Gehalt monoton mit dem Brutto-Gehalt? Ist die Steuerbelastung global progressiv? Diesen Fragen wollen wir uns widmen und zu diesem Zweck muss der funktionale Zusammenhang zwischen Brutto- und Nettogehalt erfasst werden.
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EGC: a simple case study
This blog article investigates Exact Geometric Computation libraries in general and CORE and LEDA in particular. The starting point is a simple toy problem of testing whether the sum of numbers equals zero and the question whether the way we build the sum significantly influences the runtime and memory costs. The results obtained question the practical implications of complexity analysis w.r.t. the RealRAM model and motivate optimization strategies for EGC libraries. This article also sheds light on runtime, memory and correctness issues that were raised by benchmarks.
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The new website is online
The new website is online. The old one became kind of unhandy and did not fit the requirements anymore. So I decided to give my website a facelift. Well, it turned out to be a bit more. I switched from writing php files by hand to a static website generator, namely Hyde.