René Mayrhofer

Creating X.509 certificates programmatically in Java My probem statement was simple: create a X.509 certificate with only a few fields being configurable, sign it with an already existing CA private key/certificate combination, and write the new certifica…

Executive summary dvcs-autosync is a project to create an open source replacement for Dropbox/Wuala/Box.net/etc. based on distributed version control systems (DVCS).

How to set up an OpenWRT router/gateway as an IPsec/L2TP gateway for Andoid and iPhone clients The only “reasonable” (that is, not counting PPTP due to its known security issues) VPN protocol supported by default on non-rooted / non-jailbroken Android / i…

Introduction After (again) suffering under KMail’s recent sluggishness when dealing with my email spool and general Eclipse slowness when run with many plugins (such as the excellent Android ADT or the still-to-mature Scala plugin), I decided that the best

Private Notes PrivateNotes is a cross-platform application for note-taking that allows encrypted synchronization of the notes between multiple instances using various methods.

USB sticks become increasingly common to carry around.

Introduction After some work on getting the Austrian Bürgerkarte to work under Linux, I have now decided to acquire some know-how about using more general smart cards under Linux.

Howto create a Debian chroot on an Android phone (HTC Desire and Motorola Milestone) This page will grow once I have everything running, but this is a starting point:http://www.android-hilfe.de/anleitungen-fuer-motorola-milestone/26870-ho… [HTC Desire, un…

With Kubuntu Intrepid 8.10, I can delightedly say that installing Linux in form of a Debian variant - my kernel/operating system of choice for most tasks - on a new Dell Latitude XT went flawlessly and got most of its hardware to work out-of-the-box.

To get an encrypted home directory under Debian Linux, only a few steps are necessary.

Squid is my HTTP proxy of choice for the most applications.

Motivation Suspend, a.k.a. hibernate, is an important method for usability of today’s laptops.

Introduction For an upcoming research project, I needed to get data streams from simple 2-axis accelerometers.

The mkinitrd-cd package is one of the major building blocks of the Gibraltar firewall.

Using the SpeedTouch 330 ADSL USB modem with kernel 2.4 The SpeedTouch 330 USB ADSL modem is becoming quite popular, because a lot of ISPs now give it to customers for free.

Howto use Debian GNU/Linux on a Thinkpad T42p Many of the hints on this page have actually been collected from similar pages scattered over the web; the Thinkpad series of notebooks already has strong support for running Linux on them and a wealth of info…

This is just a quick page describing what works on my notebook under Linux and (sometimes) how I got it working :-) It is no longer up-to-date, but might still be of use to somebody.

I’ve documented my current selection of smart phones and their respective features, advantages, and disadvantages elsewhere.

USB sticks are really useful.

I, as many others, have been bitten by Cyrus’ strictness when it comes to RFC-compliant email headers.

Imagine the following setting: there is some (possibly 802.11a/b/g wireless) network, which can range from a single access point to a complete backbone network of access points working together via WDS, or even a wired network infrastructure.

Here is another small thing to make working with Linux more convenient: auto-mounting of hotplug-able devices.