job
CTO at Warpnet
We help organizations build and secure systems, from code and cloud infrastructure to the hardware and protocols behind it. Security research, pentesting, and platform engineering, all in one team.
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Roald Nefs
Notes, experiments, and write-ups on security, platform engineering, and whatever hardware I’ve taken apart lately. Also home to the hands-on workshops that come out of those weekend rabbit holes.
Currently
community
Co-organizer
Helping run BSides Groningen, BSides Amsterdam, and Cloud Native Groningen, grassroots events for the curious, the technical, and the occasionally reckless.
training
Workshops & talks
Hands-on automotive security and hardware hacking sessions for conferences, meetups, and internal training days. From a one-hour talk to a full day in the lab.
Featured posts
All posts →automotive
Building a Car Hacking Test Bench
Modern cars are computers on wheel, dozens of ECUs, multiple busses, wireless interfaces, and a threat model that keeps expanding. For the past few years I …
How to extract an AppImage and add it to the Ubuntu Sidebar
In this post, we’ll guide you through extracting an AppImage and integrating it into the Ubuntu sidebar for easy access. As an example, we’ll use …
Committing Changes to a Pull Request Branch Created from a Fork
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 …
Recent posts
Browse archive →-
automotive
Building a Car Hacking Test Bench
Modern cars are computers on wheel, dozens of ECUs, multiple busses, wireless interfaces, and a threat model that keeps expanding. For the past few years I dipped my toes in the automotive security …
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How to extract an AppImage and add it to the Ubuntu Sidebar
In this post, we’ll guide you through extracting an AppImage and integrating it into the Ubuntu sidebar for easy access. As an example, we’ll use SavvyCAN, a CANBus reverse engineering …
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Committing Changes to a Pull Request Branch Created from a Fork
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 …
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Spoofing Microchips used for Animal Identification
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 …
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How to Automatically Generate Clients for your REST API
While helping a colleague with adding some code to the bunq Python SDK to allow him to retrieve some additional information from the API (bunq/sdk_python#148), we noticed that the SDK was …