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Articole: 20

  1. Full disk encryption on Windows

    (debugging works! Linux · Code · Security)

    This is a follow-up of the How to TPM blog post.

  2. Remote debugging an unbootable Linux

    (debugging works! Linux · Code · Security)

    The resources of this post can be found on Github.

  3. The current state of full disk encryption is still not good (2025)

    (debugging works! Linux · Code · Security)

    I gave a talk about the current state of full disk encryption at GPN23 (20.06.2025). slides (pdf), submission, media.ccc.de, youtube Submission / agenda In theory, full disk encryption (FDE) just works.

  4. FAQ: What is a TPM and how can I use it on Linux?

    (debugging works! Linux · Code · Security)

    Update 2025/06: Adding feedback I got (jump) Update 2025/07: Follow-up blog post with a bit more insights about Windows FDE (blog post) Update 2026/07: Update smaller things, share some experience at the end (jump) TLDR: The goal of this text is to make T…

  5. GrapheneOS's auto reboot feature for Linux laptops

    (debugging works! Linux · Code · Security)

    TLDR: I patched i3lock to update a file when I unlock my laptop.

  6. Docker: network debugging and firewalling

    (debugging works! Linux · Code · Security)

    In general I like the nicolaka/netshoot image for troubleshooting.

  7. Your Linux full disk encryption is useless

    (debugging works! Linux · Code · Security)

    Update 2025-04: Fix typos and some smaller clarifications So, you’re running Linux with full disk encryption (luks).

  8. How to Yubikey: a configuration cheatsheet

    (debugging works! Linux · Code · Security)

    Update 2025/04: Add section “Disk encryption: LUKS + fido2 device” Update 2025/04: Add section “Change FIDO2/U2F pin” This post shows different use cases for a Yubikey.

  9. How to debug a firejail sandbox

    (debugging works! Linux · Code · Security)

    So, what it firejail?

  10. Kein Internet im Flixzug unter Linux

    (debugging works! Linux · Code · Security)

    Ich sitze gerade im Flixzug und habe wieder das Problem, dass das Internet nicht funktioniert.

  11. PoC: Implementing evil maid attack on encrypted /boot

    (debugging works! Linux · Code · Security)

    I gave a talk at GPN20 about a proof of concept I wrote: an implementation of evil maid attack on devices with an encrypted /boot partition.

  12. How to analyze a core dump on Linux

    (debugging works! Linux · Code · Security)

    Some tools, links and snippets for debugging software on (Arch) Linux On Arch Linux, we get “unlimited” core dumps.

  13. How to solve hard (technical) problems

    (debugging works! Linux · Code · Security)

    Meta There are no hard problems.

  14. Checklist: debugging IPsec on Linux

    (debugging works! Linux · Code · Security)

    Why IPsec is hard to debug: The fact that you see some plain text, but not all plain text, is the most confusing aspect of IPsec to system administrators, who now believe hey are leaking plain text.

  15. Cheatsheet: network debugging on Linux

    (debugging works! Linux · Code · Security)

    Some useful commands for network debugging on Linux.

  16. How to use bpftrace

    (debugging works! Linux · Code · Security)

    So.

  17. Hands-on: Linux Accept Queue

    (debugging works! Linux · Code · Security)

    tldr: we use Apache Benchmark to send requests to an Apache + PHP-FPM backend while looking at the output of some performance analysis tools.

  18. How to debug a Linux Kernel Module

    (debugging works! Linux · Code · Security)

    Build an example module Let’s start by write a simple test module.

  19. Verifying a DKIM signature by hand

    (debugging works! Linux · Code · Security)

    tldr: We take an email and verify the DKIM-Signature step by step using python.

  20. Lightning Talk: web development in Python (German)

    (debugging works! Linux · Code · Security)

    I gave a short introduction about web development in Python (flask) at the Jugend hackt event in Berlin.