dJulkalendern 2024 Write-up
Introduction December 2024 means another year of dJulkalendern. Similar to last year, a new challenge is released each workday at 12:15 CET. The solution is always a single English word, case-i...
Petar Kostić
How a blog post about my keyboard contributed a line to the Linux kernel
Context Back in 2020, I had some problems with the USB interface of my Realforce 87UB keyboard on Ubuntu. Despite my initial struggles, I conducted some research and documented my findings in a sm...
dJulkalendern 2023 Write-up
Introduction Another year has gone by since I wrote my first write-up for dJulkalendern. The challenges this year are hosted on https://djulkalendern.se/. The challenges are presented in a calenda...
Quintor H4ck Y0ur Way 1n Challenge Write-up
Introduction At Techorama 2023 in Utrecht, the Netherlands, Quintor had an exhibition stand. Representatives of Quintor were giving out leaflets with a challenge description on it, where you’re abl...
dJulkalendern 2022 Write-up
Introduction A Swedish friend and student at KTH university introduced me to a CTF-like puzzle in an advent calendar format called dJulkalendern. A window (i.e. puzzle) will be released every week...
Online tool to read base64 encoded gzip strings to decompress EF Migration History EDMX
Motivation While working with EF migrations, I found it quite irritating to view the EDMX that Entity framework produces in the Migration History table. It is not really an issue when you’re alrea...
Making the Realforce 87U work with USB 3.0 on Ubuntu
Note: Specifically for the Realforce 87U, this fix is now obsolete/irrelevant. The USB 3.0 Link Power Management is now disabled by default in the Linux kernel for the Realforce 87U. See my more re...