Cello's Blog

Building a DIY Advent Calendar powered by Home Assistant

24 days of Bibi Blocksberg

19 hrs ago

September 2025

Building a Second Brain in Obsidian

My Workflow for Cyber Security & Software Engineering Notes

Sep 4

2

August 2025

Pen-testing without Prison

Laws every Ethical Hacker should know

Aug 29

You are Never Safe in Cyber Security

That’s the reality: complete safety does not exist.

Aug 26

Learning Cyber Security

5 Quick Wins for Your Mindset

Aug 25

July 2025

Lessons Learned: Building a Cross-Platform App with AI

I developed an app for Android and iOS without writing a single line of code.

Jul 24

1

Hack The Box: Nibbles

This is my walkthrough for the machine Nibbles on Hack The Box.

Jul 24

My guests' favorite automation is dumb as hell

I've installed quite some smart home stuff in my house.

Jul 24

Smart HDMI Switching with Home Assistant

The Problem

Jul 24

I have nothing to hide - A dangerous mindset in the age of OSINT

I often hear the argument "I have nothing to hide" when talking about data privacy.

Jul 24

Cookie Nudging

Recently, I heard the term cookie nudging for the first time in a podcast and, to be honest, I had to research what that means exactly.

Jul 24

Key Safe Overkill: Better Safe than Sorry

I bet you have a spare key for your home hidden somewhere on your property!

Jul 24