This is the personal homepage of Mattijs Jonker.

I am a PhD candidate at the University of Twente where I work in the Design and Analysis of Communication Systems (DACS) group. My research is on Distributed Denial-of-Service (DDoS) attacks, with particular emphases on attack characterization and cloud-based mitigation solutions.

Much of my research I do in collaboration with researchers from the Center for Applied Internet Data Analysis (CAIDA), where I spent nine months as visiting researcher in 2017 and 2018. CAIDA is based at University of California, San Diego's Supercomputer Center.

I also work on the OpenINTEL project, which actively measures a large part of the Domain Name System (DNS) for academic research on, e.g., network security. We make our data available to academic researchers upon request and publish datasets, where permitted, as open data to the research community. OpenINTEL is a joint project of the University of Twente, SIDN (the Netherlands ccTLD .nl registry operator), and SURFnet (the Netherlands National Research and Education Network).

My areas of expertise include Internet measurements, network security, Big Data analytics, the DNS, BGP, intrusion detection, and flow-based network traffic monitoring and analysis. I hold a Master of Science in Computer Science with a specialization in cyber security.