jaseg.de on Home

With its stock firmware, the Qualcomm SoC on the Arduino Uno Q board does not support the Linux kernel's KVM virtualization system.

During my work on the ashen project's linux kernel components, I've found secrets leaking into RAM dumps taken long after they should have been deleted by userspace.

The Arduino Uno Q Qualcomm ARM Linux board that I'm using for the Ashen project comes with full debug access unlocked.

I gave a talk about my research studying tamper-sensing mesh implementations in the wild at GPN24, a German hacker event.

There are exciting things ahead for the next year: I have been granted funding by both nlnet and by prototype fund for open-source work on an open source hardware Hardware Security Module.

A small note: As part of moving the servers and website to a new, more suitable host for my Ashen and Yanartas projects as well as the creation of yasec, my freelance consulting business, I've moved git.jaseg.de from a custom cgit/gitolite setup to a forg…

I published a piece of algorithmic art fusing a Pixação graffiti-inspired lettering style with a layout similar to a Thai Haw-taew (five row) Yantra blessing tattoo.

I wrote a layout tool generating planar coils that can handle spiral coils, toroidal coils, and hybrids in between the two.

Planar inductor supporting arbitrary shapes of spiral coils, toroidal coils, and hybrids

cgit is great, but by default when you click on a PDF file in a repository content listing it will show you a hexdump of the file.

I've got a new paper accepted at CHES, to be published in TCHES 2026/1 around beginning of December and out on eprint now.

There's many tools that render diffs on the web, but almost none that work well on small screens such as phones.

Code listings in web pages are often a bit of a pain to use.

If you need to get the path of the ipynb file in a running #Jupyter notebook, this one-liner will do the trick.

8seg is a large-scale LED light art installation that displays text on a 1.5 meter high, 30 meter wide 8-segment display made from cheap LED tape.

KiMesh is a KiCad plugin that automatically creates security meshes with two or traces covering an arbitrarily-shaped outline on the board.

Short tutorial on getting a Deutsche Telekom GPON internet connection running using a SFP ONU unit in an Ubiquiti EdgeRouter.

Paper announcement: We have published a paper on how you can DIY a tamper-sensing hardware security module from any single-board computer using a moving tamper-sensing mesh made from cheap PCBs.

I wrote a little KiCad plugin that you can use to create security meshes, heaters and other things where you need one or more traces cover the entire surface of a PCB.

I gave a short introduction into Private Contact Discovery protocols at our university workgroup.

I gave a short introduction into Hardware Security Modules at our university workgroup, including an overview on interesting research directions.

Scroll to the end for the TL;DR.

In case you were having an inferiority complex because your friends' IBM Model M keyboards are so much louder than the shitty rubber dome freebie you got with your pc...

Together, a friend and I outfitted the small staircase at Berlin's Chaos Computer Club with nice, shiny RGB-WW LED tape for ambient lighting.

After the multichannel LED driver was completed, I was just getting used to controlling LEDs at 14-bit resolution.

Recently, I have been working on a small driver for ambient lighting using 12V LED strips like you can get inexpensively from China.