https://rolbk.com/posts/Recent content in Posts on [blog@rolbk.com]#Hugo -- gohugo.ioen© 2026 Emanuel MairollSun, 04 Jan 2026 00:00:00 +0000https://rolbk.com/posts/iot5-ministories/Sun, 04 Jan 2026 00:00:00 +0000https://rolbk.com/posts/iot5-ministories/A collection of smaller home automation projects built on open source solutions from others. From magically opening entrance doors to RGB ambience behind every piece of furniture, and a standing desk that obeys Siri.https://rolbk.com/posts/matectf-birthday/Sun, 28 Dec 2025 00:00:00 +0000https://rolbk.com/posts/matectf-birthday/My friends built me a custom CTF for my 26th birthday. It had QR codes hidden in birthday cards, physical flags at ETH, and an ESP32 “rowhammer” challenge. A tale of caffeine addiction and hardware security trauma.https://rolbk.com/posts/hitcon2025-imgc0nv/Fri, 29 Aug 2025 00:00:00 +0000https://rolbk.com/posts/hitcon2025-imgc0nv/A writeup about exploiting an image converter service through path traversal and multiprocessing pickle deserialization. The solution required crafting a polyglot file that’s both a valid BMP image and a malicious pickle payload to achieve RCE.https://rolbk.com/posts/412ctf-heap-meanu/Wed, 02 Apr 2025 00:00:00 +0000https://rolbk.com/posts/412ctf-heap-meanu/A writeup for EPFL CS412’s HEAP-MEANU challenge involving heap exploitation through one-byte overflow and constrained brute-force reading. Despite full protections and modern libc 2.39, achieved RCE using a House of Spirits like attack.https://rolbk.com/posts/iot4-heislberg/Fri, 15 Nov 2024 00:00:00 +0000https://rolbk.com/posts/iot4-heislberg/How I used an ESP, Magnets and Kubernetes and to solve the great toilet crisis of 2021. A tale of absolutely necessary workplace optimization.https://rolbk.com/posts/iot3-door/Sat, 12 Aug 2023 00:00:00 +0000https://rolbk.com/posts/iot3-door/How I taught my apartment’s entrance door to recognize me and open automatically. A surprisingly practical tale of BLE authentication, hidden ESPs, and the occasional accidental door opening while driving by.https://rolbk.com/posts/iot2-window/Sat, 07 Jan 2023 00:00:00 +0000https://rolbk.com/posts/iot2-window/When your loft flat turns into a sauna every summer, the logical solution is obviously to reverse-engineer a decades-old proprietary bus protocol. A tale of digital archaeology, improvised level shifters, and ladder-based near-death experiences.https://rolbk.com/posts/iot1-sofa/Sun, 22 May 2022 00:00:00 +0000https://rolbk.com/posts/iot1-sofa/How I reverse-engineered my electric sofa to work with Home Assistant using an ESP32. After frying a transistor and some emergency soldering, I now have a voice-controlled couch.