What's this?

This is my boring website.

A few years ago, I brought my Raspi (1st generation!) online. It was just a playground. But in the meantime, I switched to two root servers.

I am still using Let’s Encrypt X.509 certificates, created and maintained by acme.sh. (Thanks a lot, Neilpang, for this great script!)

Meanwhile, I use my own name servers with DNSSEC. I renew the X.509 certificates via DNS-01 challenges.

Qualys SSL Labs is happy. The same goes for Mozilla's Observatory, Probely's Security Headers, and even Internet.nl.

Bash scripting

Writing Bash scripts in a functional style

functional_bash (also in GitLab)

Setting up an own Public key infrastructure

pki_tools (also in GitLab)

Functional programming in Haskell

Time line of my partial retirement

timeline (also in GitLab)

fully configurable version (GitLab)

Number guessing

number_guessing (also in GitLab)

Move Recursively

mvr (GitLab)

Egyptian multiplication

egyptian_multiplication (GitLab)

Create a Markdown-like list of my e-books

list-books (GitLab)

Towers of Hanoi

hanoi (GitLab)

Find a duplicate in a list

duplicate (GitLab)

Parking lot challenge

parking_lot (GitLab)