Information Security on Roald Nefs

Committing Changes to a Pull Request Branch Created from a Fork

info@roaldnefs.com (Roald Nefs) — Wed, 03 Jan 2024 20:00:00 +0200

Sometimes a pull request on GitHub.com needs some work before it can be merged into the project but you don’t want to force the required work on the pull requests original author. You’re allowed to make changes to the pull request if they are opened to a repository you have push access to, the fork is user-owned, the user has granted the required permissions and there aren’t any branch restrictions that will prevent committing.

Spoofing Microchips used for Animal Identification

info@roaldnefs.com (Roald Nefs) — Wed, 30 Nov 2022 15:19:00 +0200

A microchip implanted under the skin of an animal can be used for identification purposes. The microchips are using Radio Frequency Identification (RFID) technology to transmit an unique tag number using an electromagnetic field when in close contact with an nearby RFID reader device. The microchips are often used to help return lost pets quickly. The unique chip numbers are registered in a designated portal to let animal shelters, animal control officers and veterinarians to look up contact information of the animal’s owner. During animal trials and events the microchips are often used to verify the animals identity.

Ding Dong Ditch using SDR and Arduino

info@roaldnefs.com (Roald Nefs) — Fri, 03 Jan 2020 00:00:00 +0200

In this post we will be building a device to play Ding Dong Ditch digitally. The device will ring the doorbell every several seconds without pressing the button. This project is all about reverse engineering radio frequencies using a RLT-SDR and creating hardware using an Arduino.

This project is heavily based upon the Digital Ding Dong Ditch by Samy Kamkar .

The video is a short demonstration of the Ding Dong Ditch device. Once it’s powered by USB (or a battery) it will send out a RF signal every few seconds which will ring the doorbell.

Hardware Reversing the Sitecom Wireless Router 150N X1

info@roaldnefs.com (Roald Nefs) — Sun, 15 Dec 2019 00:00:00 +0200

Last week I’ve bought a Rigol DS1102E digital oscilloscope and was very eager to test it out. When going to my bin of old hardware I’ve found a Sitecom Wireless Router 150N X1. After opening up the router I immediately spotted the UART debugging interface (top left in the picture). In this post we will go through the process of connecting to an unknown serial interface.