Team

Tomáš Čejka is the head of the TMC research department in the CESNET association. He joined the team in 2010 and has been working as a developer and researcher. After years, he became a leader of a growing team of developers and researchers focusing on high-speed network monitoring, traffic analysis and threat detection. Tomáš Čejka has proposed and participated in many national and international research projects focused on network security, network monitoring and security threats detection. This scope was also the main research topic of his PhD thesis and habilitation thesis. At the Faculty of information technology of Czech Technical University, he is the founder of the course called Hardware-accelerated network traffic monitoring.

Jan Kořenek is the deputy head of the TMC research department and the senior researcher in the field of hardware acceleration in the CESNET association and one of the four founding fathers of the spin-off companies Flowmon Networks and Netcope Technologies. He founded Accelerated Network Technologies (ANT) research group at the Brno University of Technology and has participated in the design of most hardware architectures for fast processing of network traffic, which were successfully commercialized by the TMC department. He led a research team that designed one of the first 100 Gbps FPGA acceleration cards. In 2016, the card won the Czech Head Prize in the Industry category. In 2018, his team won the Minister of the Interior Award in security research for the design of hardware-accelerated network probes.

Václav Bartoš is a network security researcher, developer and data analyst in the area of network security. His main research interests are Cyber threat intelligence and profiling of network devices, but he also has experience with network traffic analysis using flow data and with detection of security incidents. He has participated in a number of national and European research projects such as GEANT GN4, PROTECTIVE, SAPPAN and many others. He is the main author of the NERD system, which has been deployed in CESNET infrastructure. Currently, he leads research and development in the area of autodiscovery and classification of network devices.

Jan Kučera is the leader of a research team that works on the development of tools for DDoS attacks mitigation. Besides the employment in CESNET, he is a Ph.D. student at the Faculty of Information Technology, Brno University of Technology. The main topic of his research is the acceleration of time-critical networking operations, particularly in the area of high-speed networks and intrusion prevention systems. For his research efforts and achievements, he received the Zdena Rábová award and the Brno University of Technology Rector’s Award.

Jiří Sikora is a researcher and developer with a focus on the hardware design of FPGA network cards. He has a long-time experience with hardware design in Flextronics Ltd. company. He is the main author of our modern PCIe 40G, 100G, and 200G network cards based on the Intel and Xilinx FPGAs. These cards are deployed on the perimeter of CESNET network for network monitoring and security purposes. Currently, he has been working on the design of FPGA based PCIe Gen5 card for the 400G Ethernet technology.

Michal Vaško is a senior software developer focusing on network configuration technology. Currently, he is the development leader of the open-source tools and libraries related to NETCONF, Yang, and sysrepo. He and his team support the open-source projects libyang, libnetconf2, netopeer2, sysrepo and take care of the related development community. The tools are well-known world wide, especially in the IETF community. Michal is very active in adopting recent specification drafts into the open-source running code. Recently he focuses on standardization of new features via IETF.

Karel Hynek is a senior researcher at CESNET, where he has been active since 2019. He leads the Network Traffic Analysis research group, which focuses on advancing methods for high‑performance traffic monitoring, anomaly detection, and the application of machine learning in network security. Under his leadership, the team contributes to numerous research and development activities and maintains several open‑source projects, including ipfixprobe and NEMEA. Karel’s expertise lies in encrypted traffic monitoring and analysis, where he combines advanced statistical methods with machine learning techniques to enhance network visibility and threat detection in modern encrypted environments.