Ivan Homoliak
I'm an associate professor in system security at Brno University of Technology and Slovak Technical University, currently working on blockchain-based authentication schemes, consensus protocols, electronic voting, decentralized identity, and central bank digital currency (CBDC). I previously did research at SUTD as a postdoctoral research fellow working with colleagues on blockchain security testing and insider threat detection using machine learning approaches. My work focuses on designing, implementing, and optimizing novel security systems and solutions.
I earned my Ph.D. in adversarial intrusion detection in network traffic from Brno University of Technology in 2016, and obtained my associate professorship at the same university with a habilitation aimed at secure decentralized applications and consensus protocols in blockchains. My research spans multiple areas, including cryptography and security, distributed computing, and machine learning applications in security. I'm particularly interested in the intersection of traditional security mechanisms with emerging blockchain technologies.
I am the main author of SmartOTPs - the first OTP scheme designed specifically for smart contract wallets, which represents my broader interest in making cryptocurrency systems more secure and usable. My current research portfolio includes work on privacy-preserving consensus mechanisms, scalable electronic voting systems, and the security challenges of decentralized applications. I focus on both theoretical contributions and practical implementations that can be deployed in real-world systems.
Publications
Mitigating Undercutting Attacks: Fee-Redistribution Smart Contracts for Transaction-Fee-Based Regime of Blockchains with the Longest Chain Rule
Rastislav Budinský, Ivana Stančíková, I. Homoliak
International Congress on Blockchain and Applications 2023
HADES-IoT: A Practical and Effective Host-Based Anomaly Detection System for IoT Devices (Extended Version)
Dominik Breitenbacher, I. Homoliak, Y. Aung, Y. Elovici, Nils Ole Tippenhauer
IEEE Internet of Things Journal 2022
IEEE International Conference on Blockchain and Cryptocurrency
Monday May, Tuesday May, Wednesday May, Thursday May, May Friday, Bruno Casella, Lorenzo Paletto, Toshiko Matsui, Keigo Kimura, Mitsuyoshi Imamura, Kazumasa Omote, Kyungchan Ko, Taeyeol Jeong, Jongsoo Woo, James Won-Ki Hong POSTECH, Jozef Drga, I. Homoliak, Martin Peresíni, P. Hanáček, Jan Lauinger, Jens Ernstberger, Sebastian Steinhorst, F. J. F. Peñuela, F. D. Muñoz-Escoí, , Artem Barger, Karl Seidenfad, Jan Biermann, Kiarash Shamsi, Koosha Esmaeilzadeh, Sara Khorasani, Rouhani Cuneyt, Akcora, Xinxin Fan, Zhi Zhong, Dong Guo, Qi Chai, Simone Romano, Kazuyuki Shudo, Tsuyoshi Hasegawa, Robert Muth, Florian Tschorsch
2022 IEEE Crosschain Workshop (ICBC-CROSS) 2022
BBB-Voting: 1-out-of-k Blockchain-Based Boardroom Voting
Sarad Venugopalan, I. Homoliak, Zengpeng Li, Pawel Szalachowski
arXiv.org 2020
Security and Encryption at Modern Databases
Martin Očenáš, I. Homoliak, P. Hanáček, K. Malinka
International Conference on Cryptography, Security and Privacy 2020
SmartOTPs: An Air-Gapped 2-Factor Authentication for Smart-Contract Wallets.
I. Homoliak, Dominik Breitenbacher, Alexander Binder, Pawel Szalachowski
Increasing Trust in Tor Node List Using Blockchain
Lukás Hellebrandt, I. Homoliak, K. Malinka, P. Hanáček
International Conference on Blockchain 2019
Survey of Privacy Enabling Strategies in IoT Networks
Lukás Hellebrandt, Ondřej Hujňák, P. Hanáček, I. Homoliak
TWOS: A Dataset of Malicious Insider Threat Behavior Based on a Gamified Competition
A. Harilal, Flavio Toffalini, J. H. Castellanos, J. Guarnizo, I. Homoliak, Martín Ochoa
MIST@CCS 2017
Exploitation of NetEm Utility for Non-payload-based Obfuscation Techniques Improving Network Anomaly Detection
I. Homoliak, Martin Teknos, M. Barabas, P. Hanáček
Security and Privacy in Communication Networks 2016
On the application of symbolic regression and genetic programming for cryptanalysis of symmetric encryption algorithm
Tomas Smetka, I. Homoliak, P. Hanáček
International Carnahan Conference on Security Technology 2016
Features for Behavioral Anomaly Detection of Connectionless Network Buffer Overflow Attacks
I. Homoliak, L. Sulak, P. Hanáček
Web Information System and Application Conference 2016
NBA of obfuscated network vulnerabilities' exploitation hidden into HTTPS traffic
I. Homoliak, Daniel Ovsonka, M. Grégr, P. Hanáček
International Conference for Internet Technology and Secured Transactions 2014
Characteristics of buffer overflow attacks tunneled in HTTP traffic
I. Homoliak, Daniel Ovsonka, Karel Koranda, P. Hanáček
International Carnahan Conference on Security Technology 2014
A concept of behavioral reputation system in wireless networks
Matej Kacic, P. Hanáček, Martin Henzl, I. Homoliak
International Carnahan Conference on Security Technology 2013
DAG-Sword: A Simulator of Large-Scale Network Topologies for DAG-Oriented Proof-of-Work Blockchains
Martin Peresíni, Tomás Hladký, K. Malinka, I. Homoliak
Hawaii International Conference on System Sciences 2024
Resilience of Voice Assistants to Synthetic Speech
K. Malinka, Anton Firc, Petr Kaska, Tomás Lapsanský, Oskar Sandor, I. Homoliak
European Symposium on Research in Computer Security 2024
Counting in Regexes Considered Harmful: Exposing ReDoS Vulnerability of Nonbacktracking Matchers
Lenka Turonová, L. Holík, I. Homoliak, Ondřej Lengál, Margus Veanes, Tomáš Vojnar
USENIX Security Symposium 2022
2 Background and Problem Definition 2 . 1 Nakamoto Consensus and Bitcoin
Pawel Szalachowski, Daniël Reijsbergen, I. Homoliak, Siwei Sun
Insight into Insiders: A Survey of Insider Threat Taxonomies, Analysis, Modeling, and Countermeasures
I. Homoliak, Flavio Toffalini, J. Guarnizo, Y. Elovici, Martín Ochoa
arXiv.org 2018
ASNM: Advanced Security Network Metrics for Attack Vector Description
I. Homoliak, M. Barabas, P. Chmelar, M. Drozd, P. Hanáček
Detection of network buffer overflow attacks: A case study
M. Barabas, I. Homoliak, Matej Kacic, P. Hanáček
International Carnahan Conference on Security Technology 2013