I’m associate professor of Computer Network Security in the Design and Analysis of Communication Systems (DACS) group at the Faculty of Electrical Engineering, Maths and Computer Science (EEMCS) at the University of Twente.
I am also principal scientist at NLnet Labs, a not-for-profit foundation dedicated to research into and open source software for the core protocols of the Internet.
For more information, see my CV.
My research focuses on network security, with a particular interest in the Domain Name System (DNS) in the broadest sense. After IP, DNS is the most critical protocol on the Internet, without which the Internet effectively stops working for most users. I explore the security of the DNS using large scale measurements and statistical analysis, for instance studying the effects of the deployment of the DNS Security Extensions (DNSSEC), both in the positive (added security) and the negative (larger potential for abuse in DDoS attacks) sense. DNS also plays an important role in other security issues on the Internet, such as botnets, phishing and malware. Apart from performing my own research in this area, I contribute to the work of my colleagues who perform research in the area of network security and stability, helping them out with my expertise on the DNS.
My research is supported by SURF, the collaborative organisation for ICT in Dutch higher education and research, by the Netherlands Organisation for Scientific Research (NWO) by SIDN Fonds and by European Commission Framework Project grants.
I regularly review for IEEE Communications Magazine (ComMag), ACM/IEEE Transactions on Networking (TON), ACM SIGCOMM Computer Communication Review (CCR), IEEE Transactions on Network and Service Management (TNSM), ACM Digital Threats: Research and Practice (DTRAP) and other journals.
In 2019, I was one of the general chairs of the ACM Internet Measurement Conference (IMC 2019), which was held in Amsterdam, October 21-23.
I also regularly serve on TPCs, current service includes:
Ph.D. in Computer Science, 2017
University of Twente
M.Sc. in Computer Science, 2001
University of Twente
I am daily supervisor of the following Ph.D. candidates in our group:
All Ph.D. candidates I supervise are advised by prof. dr. ir. Aiko Pras
I am currently not supervising any master students. If you are a master student interested in an assignment, please contact me or come by my office. I also supervise external master assignments at NLnet Labs (directly) and other organisations (as university supervisor) including SURFnet and SIDN.
I am currently not supervising any bachelor students. If you are a bachelor student enrolled in the CS, EE or BIT curriculum at the University of Twente and looking for a bachelor assignment, contact me, or pass by my office.