Publications

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2026:

Koumar, Josef; Smoleň, Timotej; Jeřábek, Kamil; Čejka, Tomáš Comparative Analysis of Deep Learning Models for Real-World ISP Network Traffic Forecasting IEEE Transactions on Network and Service Management.
Luxemburk, Jan; Hynek, Karel; Plný, Richard; Čejka, Tomáš Universal Embedding Function for Traffic Classification via QUIC Domain Recognition Pretraining: A Transfer Learning Success IEEE Transactions on Network and Service Management.

2025:

M\"{u}cke, Jonas; Nawrocki, Marcin; Hiesgen, Raphael; Sattler, Patrick; Zirngibl, Johannes; Carle, Georg; Luxemburk, Jan; Schmidt, Thomas C.; W\"{a}hlisch, Matthias Waiting for QUIC: Passive Measurements to Understand QUIC Deployments Proc. ACM Netw..
Hulák, Matej; Bartoš, Václav; Koumar, Josef; Čejka, Tomáš DAF: Device Annotation Framework 2025 21st International Conference on Network and Service Management (CNSM).
Oškera, Dominik; Koumar, Josef; Pokorná, Alžběta; Jeřábek, Kamil; Čejka, Tomáš Botnet Detection Through Periodic Patterns in Command-and-Control Network Traffic 2025 21st International Conference on Network and Service Management (CNSM).
Kureš, Milan; Koumar, Josef; Hynek, Karel CESNET TS-Zoo: A Library for Reproducible Analysis of Network Traffic Time Series 2025 21st International Conference on Network and Service Management (CNSM).
Jozsa, Richard; Hynek, Karel; Pekar, Adrian Taming Volatility: Stable and Private QUIC Classification with Federated Learning 2025 21st International Conference on Network and Service Management (CNSM).
Plny, Richard; Hynek, Karel On Evaluation of Data Fusion Methods for Network Traffic Classification 2025 21st International Conference on Network and Service Management (CNSM).
Bartoš, Václav; Novotná, Michaela; Hulák, Matej CESNET Idle OS Traffic: A Dataset of Idle Traffic of Various Operating Systems 2025 21st International Conference on Network and Service Management (CNSM).
Jerabek, Kamil; Luxemburk, Jan; Plny, Richard; Koumar, Josef; Pesek, Jaroslav; Hynek, Karel When Simple Model Just Works: Is Network Traffic Classification in Crisis?
Pesek, Jaroslav; Luxemburk, Jan; Hynek, Karel Lightweight Traffic Classification: A Simple Baseline Matching Deep Learning Performance 2025 9th Network Traffic Measurement and Analysis Conference (TMA).
Koumar, Josef; Pesek, Jaroslav; Jerabek, Kamil; Čejka, Tomáš Towards Building Network Outlier Detection System for Network Traffic Monitoring NOMS 2025-2025 IEEE Network Operations and Management Symposium.
Pesek, Jaroslav; Fukuda, Kensuke; Cejka, Tomas Interpretable Threat Detection with Evidential Classifier: The MQTT Case NOMS 2025-2025 IEEE Network Operations and Management Symposium.
Jerabek, Kamil; Koumar, Josef; Setinský, Jiří; Pesek, Jaroslav Explainable Anomaly Detection in Network Traffic Using LLM NOMS 2025-2025 IEEE Network Operations and Management Symposium.
Koumar, Josef; Hynek, Karel; Čejka, T.,; Šiška, Pavel CESNET-TimeSeries24: Time Series Dataset for Network Traffic Anomaly Detection and Forecasting Scientific Data.

2024:

Plný, R.; Hynek, K.,; Šiška, P. WIF: Efficient Library for Network Traffic Analysis 2024 20th International Conference on Network and Service Management (CNSM).
Hynek, K.; Luxemburk, J.; Pešek, J.; Čejka, T.,; Šiška, P. CESNET-TLS-Year22: A year-spanning TLS network traffic dataset from backbone lines Scientific Data.
Luxemburk, J.; Hynek, K. Towards reusable models in traffic classification Proceedings of the 8th Network Traffic Measurement and Analysis Conference.
Jeřábek, K.; Hynek, K.,; Ryšavý, O. Comparative analysis of DNS over HTTPS detectors Computer Networks.
Koumar, J.; Hynek, K.; Pešek, J.,; Čejka, T. NetTiSA: Extended IP flow with time-series features for universal bandwidth-constrained high-speed network traffic classification Computer Networks.
Martínek, T.; Kořenek, J.,; Čejka, T. LGBM2VHDL: Mapping of LightGBM Models to FPGA 2024 IEEE 32nd Annual International Symposium on Field-Programmable Custom Computing Machines (FCCM).
Soukup, D.; Uhříček, D.; Vašata, D.,; Čejka, T. Machine Learning Metrics for Network Datasets Evaluation ICT Systems Security and Privacy Protection.

2023:

Jan Luxemburk; Karel Hynek; Tomáš Čejka; Andrej Lukačovič; Pavel Šiška CESNET-QUIC22: A large one-month QUIC network traffic dataset from backbone lines 2023 7th Network Traffic Measurement and Analysis Conference (TMA).
Jan Luxemburk; Tomáš Čejka Fine-grained TLS services classification with reject option 2023 IEEE 13th Annual Computing and Communication Workshop and Conference (CCWC).
Wasielewska, Katarzyna; Soukup, Dominik; Cejka, Tomáš; Camacho, José Evaluation of the Limit of Detection in Network Dataset Quality Assessment with PerQoDA Machine Learning and Principles and Practice of Knowledge Discovery in Databases.

2022:

Plný, Richard; Hynek, Karel; Cejka, Tomáš DeCrypto: Finding Cryptocurrency Miners on ISP Networks Secure IT Systems.
Melcher, Lukáš; Hynek, Karel; Čejka, Tomáš Tunneling through DNS over TLS providers 2022 18th International Conference on Network and Service Management (CNSM).
Kamil Jeřábek; Karel Hynek; Tomáš Čejka; Ondřej Ryšavý Collection of datasets with DNS over HTTPS traffic Data in Brief.
Hynek, Karel; Vekshin, Dmitrii; Luxemburk, Jan; Cejka, Tomas; Wasicek, Armin Summary of DNS Over HTTPS Abuse IEEE Access.

2021:

Orsak, M.; Benes, T. High-speed stateful packet classifier based on TSS algorithm optimized for off-chip memories 2021 17th International Conference on Network and Service Management (CNSM).

2020:

Hynek, Karel; Cejka, Tomas Privacy Illusion: Beware of Unpadded DoH 2020 11th IEEE Annual Information Technology, Electronics and Mobile Communication Conference (IEMCON).
Bene{š Pipelined ALU for effective external memory access in FPGA 2020 23rd Euromicro Conference on Digital System Design (DSD).
Vekshin, Dmitrii; Hynek, Karel; Cejka, Tomas DoH Insight: Detecting DNS over HTTPS by Machine Learning Proceedings of the 15th International Conference on Availability, Reliability and Security.
Hynek, Karel; Beneš, Tomáš; Cejka, Tomáš; Kubátová, Hana Refined Detection of SSH Brute-Force Attackers Using Machine Learning ICT Systems Security and Privacy Protection.
K. {Hynek}; T. {Čejka}; M. {Žádník}; H. {Kubátová} Evaluating Bad Hosts Using Adaptive Blacklist Filter 9th Mediterranean Conference on Embedded Computing (MECO).

2019:

Soukup, Dominik; Hujňák, Ondřej; Štefunko, Simon; KrejC{\'\i Security Framework for IoT and Fog Computing Networks 2019 Third International conference on I-SMAC (IoT in Social, Mobile, Analytics and Cloud)(I-SMAC).
Soukup, Dominik; Cejka, Tomas; Hynek, Karel Behavior Anomaly Detection in IoT Networks International conference on Computer Networks, Big data and IoT.

2018:

Jánsk\'{y Augmented DDoS Mitigation with Reputation Scores Proceedings of the 13th International Conference on Availability, Reliability and Security.
Pavel Benáček; Viktor Puš; Hana Kubátová; Tomáš Čejka P4-To-VHDL: Automatic generation of high-speed input and output network blocks Microprocessors and Microsystems.
Jiří Havránek; Petr Velan; Tomas Cejka; Pavel Benáček Enhanced Flow Monitoring with P4 Generated Flexible Packet Parser AIMS 2018.

2017:

Jánský, Tomáš; Čejka, Tomáš; Bartoš, Václav Hunting SIP Authentication Attacks Efficiently Security of Networks and Services in an All-Connected World: 11th IFIP WG 6.6 International Conference on Autonomous Infrastructure, Management, and Security, AIMS 2017, Zurich, Switzerland, July 10-13, 2017, Proceedings.
Čejka, Tomáš; Žádník, Martin Preserving Relations in Parallel Flow Data Processing Security of Networks and Services in an All-Connected World: 11th IFIP WG 6.6 International Conference on Autonomous Infrastructure, Management, and Security, AIMS 2017, Zurich, Switzerland, July 10-13, 2017, Proceedings.
Švepeš, Marek; Čejka, Tomáš Making Flow-Based Security Detection Parallel Security of Networks and Services in an All-Connected World: 11th IFIP WG 6.6 International Conference on Autonomous Infrastructure, Management, and Security, AIMS 2017, Zurich, Switzerland, July 10-13, 2017, Proceedings.

2016:

Tomas Cejka; Václav Bartoš; Marek Svepes; Zdenek Rosa; Hana Kubatova {NEMEA:} A Framework for Network Traffic Analysis 12th International Conference on Network and Service Management (CNSM 2016).
Zdenek Rosa; Tomas Cejka; Martin Zadnik; Viktor Puš Building a Feedback Loop to Capture Evidence of Network Incidents 12th International Conference on Network and Service Management (CNSM 2016).
Cejka, Tomas; Svepes, Marek Analysis of Vertical Scans Discovered by Naive Detection Management and Security in the Age of Hyperconnectivity: 10th IFIP WG 6.6 International Conference on Autonomous Infrastructure, Management, and Security, AIMS 2016.
Čejka, Tomáš; Krejčí, Radek Configuration of open vSwitch using OF-CONFIG NOMS 2016 - 2016 IEEE/IFIP Network Operations and Management Symposium.

2015:

Cejka, Tomas; Bartos, Vaclav; Truxa, Lukas; Kubatova, Hana Using Application-Aware Flow Monitoring for SIP Fraud Detection Intelligent Mechanisms for Network Configuration and Security: 9th IFIP WG 6.6 International Conference on Autonomous Infrastructure, Management, and Security, AIMS 2015.

2014:

Cejka, Tomas; Rosa, Zdenek; Kubatova, Hana Stream-wise detection of surreptitious traffic over dns 2014 IEEE 19th International Workshop on Computer Aided Modeling and Design of Communication Links and Networks (CAMAD).
Benáček, Pavel; Blažek, Rudolf B.; Čejka, Tomáš; Kubátová, Hana Change-point Detection Method on 100 Gb/s Ethernet Interface Proceedings of the Tenth ACM/IEEE Symposium on Architectures for Networking and Communications Systems.
Čejka, Tomáš; Kekely, Lukáš; Benček, Pavel; Blažek, Rudolf B.; Kubátová, Hana FPGA Accelerated Change-Point Detection Method for 100 Gb/s Networks 9th Doctoral Workshop on Mathematical and Engineering Methods in Computer Science (MEMICS 2014).