Greg* Alpár
is assistant professor at the Open Universiteit / Department of Computer Science and researcher at the Radboud University / Institute for Computing and Information Sciences / Digital Security
group. I am also a member of the PI.lab.
Previously I was a post-doctorate lecturer and researcher at RU's Faculty of Science Institute for Computing and Information Sciences (ICIS) department within the Digital Security group, after finishing my PhD project also there. During my PhD I was also a member of the TNO Security department. My
background is mathematics and education (Master of Science at ELTE, Budapest, Hungary), coding theory and
cryptography (Professional Doctorate in Engineering at TU/e in Eindhoven, The Netherlands, in the program
Mathematics for
Industry). My Ph.D. was about about Attribute-based
identity management.
Keywords. mathematics education, cryptography, privacy, attribute-based identity management, security, attribute-based credentials, hardware security, computer network
*Officially Gergely, but please call me Greg.
NEWS
15 December 2020. We have won two projects within the Open University's Quality development grant program (Kwaliteitsafspraken): Cybersecurity videochunks, Uitnodigende wiskunde.
Contents
How to reach me?
Mostly I work in Nijmegen at the Radboud University, ICIS Digital Security
group. Otherwise, you can reach me by any of the e-mail addresses below.
During the Corona period, it's easiest to reach me via e-mail.
- address: Mercator I, Tournooiveld 212, 6525 EC Nijmegen
- room: 2.16
- tel.: +31 (0) 24 3652645
- e-mail (Open Universiteit): greg.alpar ou.nl
- e-mail (Radboud): g.alpar cs.ru.nl
- Skype: alpargergo
Grants and awards
- 2020. 'Uitnodigende exacte vakken' binnen de Kwaliteitsafspraken. Developing and teaching a course about learning science subjects at the university level. Granted by the Open University of the Netherlands.
- 2020. 'Cybersecurity videochunks' binnen de Kwaliteitsafspraken. Creating in-depth video tutorials for selected security-related topics. Granted by the Open University of the Netherlands.
- 2018. 'Open Maths – activating learning mathematics online'. Comenius Teaching Fellow. Developing and teaching a course about learning mathematics at the university level. Granted by NRO.
- 2016. Travel Grant for a Teaching Period at Stanford University: Visiting professor Jo Boaler ('EDUC 263A: Curriculum and Instruction in Mathematics'). Granted by Radboud University.
Journal Publications
- W. Lueks, G. Alpár, J.-H. Hoepman, and P. Vullers. Fast Revocation of Attribute-Based Credentials for Both Users and Verifiers. In Journal of Computers & Security 2016.
link, local copy)
- G. Alpár, J.-H. Hoepman, and J. Siljee. The Identity Crisis -- Security, Privacy and Usability Issues in Identity Management. In Journal of Information System Security 2013.
link)
Conference Proceedings Publications
2021
- M. Venema, G. Alpár. A Bunch of Broken Schemes: A Simple yet Powerful Linear Approach to Analyzing Security of Attribute-Based Encryption. In
Proceedings of CT-RSA 2021.
CT-RSA 2021.
- M. Lawende, H. Passir, G. Alpár. Reproduction for Insight: Towards Better Understanding the Quality of Students Tests. In
Proceedings of ITiCSE 2021.
ITiCSE 2021.
2020
- W. Lueks, B. Hampiholi, G. Alpár, C. Troncoso. Tandem: Securing
Keys by Using a Central Server While Preserving Privacy. In
Proceedings on Privacy Enhancing Technologies, Volume 2020: Issue 3.
PETs (Sciendo).
2019
- G. Alpár, M. van Hoeve. Towards Growth-Mindset Mathematics Teaching in the Netherlands. (EPiC Series in Education Science), 2019. (local copy)
- A. Rasool, G. Alpár, J. de Ruiter. State machine inference of QUIC. (arXiv), 2019. (local copy)
2018
- W. Lueks, B. Hampiholi, G. Alpár, C. Troncoso. Tandem: Securing Keys by Using a Central Server While Preserving Privacy. (arXiv), 2018. (local copy)
- E. Roubtsova, S. Roubtsov, G. Alpár. Presence Patterns and Privacy Analysis. BMSD 2018, pp 298-307, LNBIP 319, Springer, 2018. (local copy)
2017
- B. Hampiholi, G. Alpár. Privacy-preserving webshopping with attributes. IEEE Symposium on Privacy-Aware Computing (IEEE PAC 2017), Washington DC, USA, 2017. (local copy)
- G. Alpár, F. van den Broek, B. Hampiholi, B. Jacobs, W. Lueks, S. Ringers. IRMA: practical, decentralized and privacy-friendly identity management using smartphones. 10th Workshop on Hot Topics in Privacy Enhancing Technologies (HotPETs 2017), Minneapolis, USA, 2017. (local copy)
2016
- G. Alpár, L. Batina, L. Batten, V. Moonsamy, A. Krasnova, A. Guellier, and I. Natgunanathan. New Directions in IoT Privacy Using Attribute-Based Authentication–Position Paper. Proceedings of the 1st ACM Malicious Software and Hardware in Internet of Things Workshop (MAL-IoT16), Italy, 2016. (local copy)
2015
- Brinda Hampiholi, Gergely Alpár, Fabian van den Broek and Bart Jacobs. Towards practical Attribute-Based Signatures.
Proceedings of the Fifth International Conference on Security, Privacy, and Applied Cryptography Engineering (SPACE 2015), Jaipur, India, October 3-7, 2015. (link and local copy)
- Wouter Lueks, Gergely Alpár, Jaap-Henk Hoepman, and Pim Vullers. Fast
Revocation of Attribute-Based Credentials for Both Users and Verifiers.
In Proceedings of the IFIP International Information Security and Privacy
Conference (IFIP SEC 2015), Hamburg, May 26-28, 2015.
The extended version of the paper is available in the IACR ePrint Archive, link)
2014
- Merel Koning, Paulan Korenhof, Gergely Alpár and Jaap-Henk Hoepman. The
ABC of ABC: an analysis of attribute-based credentials in the light of data
protection, privacy and identity. In Proceedings of the 10th
International Conference on Internet, Law & Politics (IDP 2014): A decade of
transformations, pages 357-374, Barcelona, July 3-4, 2014. (link to pdf, 196kB)
The paper was also presented at the 7th Workshop on Hot Topics in Privacy Enhancing
Technologies (HotPETS 2014, link)
2013
- Gergely Alpár and Jaap-Henk Hoepman. A Secure Channel for Attribute-based
Credentials [Short paper]. In Proceedings of the 2013 ACM Workshop on
Digital Identity Management (DIM 2013), pages 13-18, Berlin, November 8, 2013. (link to pdf,
130kB)
- Gergely Alpár and Maarten H. Everts. Mobile Devices to the Identity
Rescue. In Proceedings of the IFIP Summer School, Nijmegen, The Netherlands,
June, 2013. (link to pdf,
315kB)
- Kostas Papagiannopoulos, Gergely Alpár, and Wouter Lueks. Desigated Attribute Proofs
with the Camenish–Lysyanskaya Signature. In 34th WIC Symposium on Information Theory,
2013. (link to paper,
309kB, link to poster,
146kB)
- Manu Drijvers, Pedro Luz, Gergely Alpár and Wouter Lueks. Ad Hoc Voting on Mobile
Devices. In 34th WIC Symposium on Information Theory,
2013. (link to paper,
660kB, link to poster,
123kB)
- Gergely Alpár and Bart Jacobs. Credential Design in Attribute-Based Identity
Management. In Ronald Leenes and Eleni Kosta, editors, Bridging distances in
technology and regulation, pages 189-204, 3rd TILTing Perspectives Conference,
Tilburg, NL, April 25-26, 2013. (link to pdf,
632kB)
- Gergely Alpár, Jaap-Henk Hoepman, Wouter Lueks. An Attack Against Fixed Value
Discrete Logarithm Representations. Cryptology ePrint Archive: Report 2013/120.
(link)
- Pim Vullers and Gergely Alpár. Efficient Selective Disclosure on Smart Cards
Using Idemix. In Simone Fischer-Hübner, Elisabeth de Leeuw, and Chris Mitchell
editors, Policies and Research in Identity Management (IDMAN),
3rd IFIP WG 11.6 Working Conference, London, UK, IFIP AICT 396, pages 53–67. Springer, 2013. (link to pdf,
329kB)
2012
- Gergely Alpár, Lejla Batina, Wouter Lueks. Designated Attribute-Based Proofs for
RFID Applications,
In Jaap-Henk Hoepman and Ingrid Verbauwhede, editors, RFID Security and Privacy
(RFIDsec), LNCS 7739, Nijmegen, The Netherlands, pages 59–75. Springer, 2012.
2012. (link to pdf,
207kB)
- Gergely Alpár, Lejla Batina, Roel Verdult. Using NFC Phones for Proving Credentials,
PILATES 2012, LNCS 7201, Kaiserslautern, Germany,
2012. (link to pdf,
180kB)
2011
- Gergely Alpár, Jaap-Henk Hoepman. Avoiding Man-in-the-Middle Attacks When Verifying Public
Terminals. In Proceedings of IFIP Summer School, Trento, Italy, (IFIP AICT 375 proceedings),
2011. (link to pdf,
279kB)
- Gergely Alpár, Jaap-Henk Hoepman, Johanneke Siljee. The Identity Crisis. Security, Privacy
and Usability Issues in Identity Management (link)
Teaching
2021 Spring
- Uitnodigende exacte vakken (A1901P, optional course) - lecturer,
examiner (experimental course!) (link)
- Security en IT (IB1802, 5 ec) - teacher (link)
2020 Autumn
- Software Engineering (IB3102, 5 ec) - teacher, examinator (link)
- Computernetwerken (IB0702, 5 ec) - teacher, examinator (link)
- Software Quality Management (IM0703, 7.5 ec) - teacher, deputy examiner (link)
2020 Spring
- Software Life Cycle (IM0303, 7.5 ec) - lecturer, examiner (last!) (link)
- Security en IT (IB1802, 5 ec) - teacher (link)
2019 Autumn
- Software Engineering (IB3102, 5 ec) - examinator (link)
- Computernetwerken (IB0702, 5 ec) - examinator (link)
- Software Quality Management (IM0703, 7.5 ec) - teacher, deputy examiner (link)
2019 Spring
- Software Life Cycle (IM0303, 7.5 ec) - lecturer, examiner (link)
- Research Preparation (IM0101, 2.5 ec) - teacher (link)
- Software Architecture (IM0203, 7.5 ec) - teacher (link)
- Open Maths (experimental course) - examiner, teacher (link, yOUlearn link)
2018 Autumn
- Research Preparation (IM0101, 2.5 ec) - teacher (link)
- Software Engineering (IB3102, 5 ec) - examiner (link)
2018 Spring
- Research Preparation (IM0101, 2.5 ec) - teacher (link)
- Software Life Cycle (IM0303, 7.5 ec) - lecturer, examiner (link)
2017 Autumn
- Software Engineering (T07351, 4.3 ec) - lecturer, examiner (link)
2017 Spring
- Computer Networking (6 ec) - lecturer, coordinator (link)
- Software Life Cycle - lecturer, examiner (link)
2016 Autumn
- Software Engineering (4.3 ec) - lecturer, examiner (link)
- Security and IT (4.3 ec) - lecturer (link)
2016 Spring
- Computer Networking (6 ec) - lecturer (link)
- Introduction to Cryptography (6 ec) - lecturer (link)
2015 Autumn
2015 Spring
- Computer Networks and Distributed Systems (6 ec) - lecturer (link)
- Cryptography (6 ec) - TA and partial lecturer (link)
2014 Autumn
- Hardware Security (6 ec) - lecturer (link)
- Security (6 ec) - TA (link)
- Calculus en Kansrekening (3 ec) - TA (link)
2013 Spring
- Introduction to Cryptographic Algorithms and Protocols - TA (link)
2012 Autumn
Students and supervision
PhD Students
- Marloes Venema. 2018-2022. Marloes is doing research about privacy-enforcing access control on a cryptographic level.
- Brinda Hampiholi. 2014-2018. Brinda's PhD is about contextual identities with attributes within the project of 'Own Your Own Identity - Attribute-based authentication on smart phones'. Brinda defends her thesis on 28 May 2019.
PhD committees
- 2018
- Paul Fiterău-Broştean: Active Model Learning for the Analysis of Network Protocols (PhD reading committee)
- 2017
- Wouter Lueks: Security and Privacy via Cryptography. Having your cake and eating it too (PhD committee)
- Sven Kiljan: Exploring, Expanding and Evaluating Usable Security in Online Banking (PhD committee)
- 2016
Bachelor and master students
- 2019
- Jarco Schutrup (master); topic: feasibility study of attribute-based access control using IRMA.
- Maurits Lawende (bachelor); topic: suitability of students unit tests
- Irene de Ruyter (bachelor); topic: privacy analysis of IRMA over QUIC
- Klaas van Slageren (bachelor); topic: exploration and implementation of IRMA over QUIC
- Daniel Ostkamp (master); topic: IRMA and Verifiable Credentials.
- 2018
- Mitchell Duim (Master thesis); topic: privacy analysis of Android network traffic
- Thierry van Ekeren (Master thesis); topic: the QUIC protocol in business context
- Abdullah Rasool (Master thesis) co-supervision with Joeri de Ruiter; topic: model learning of the QUIC protocol. The thesis and the model can be found in the Automata Wiki.
- 2017
- Ali Reza Ghavamipour (Master thesis): Privacy everywhere you go: Electric vehicles in a private and public charging infrastructure
- Raoul Estourgie (Master research internship): Elliptic-curve cryptography in the IRMA library
- Ali Reza Ghavamipour (Master research internship): Implementing online shopping with anonymous credentials
- 2016
- Gerben Geltink (Master thesis): Concealing Ketje: A Lightweight PUF-based Authentication Protocol
- Abdullah Rasool (Bachelor thesis): AAWSOME -- Anonymous Authentication for WiFi and Some Real World Scenarios
- Tom Nies (Bachelor thesis): Privacy Protection Against Cross-Device Tracking Methods
- 2015
- Brinda Hampiholi (Ph.D.
co-supervision with Bart Jacobs): Own Your Own
Identity - Attribute Based Credentials implementation on SIM cards
- 2014
- Tim van de Kamp (Master thesis): Combining ABCs with ABE - Privacy-Friendly
Key Generation for Smart Card Based Attribute-Based Encryption
- Maarten Derks (Research B): Ajax and privacy
- 2012
- Kostas Papagiannopoulos (Research B): Designated attribute proofs with
the CL signature
- Karin Huijben (Research A): Shibboleth technology for inter-cloud
communication
- Pedro Luz and Manu Drijvers (Research A): Ad hoc e-voting
PhD Project
- Start: 2010 March
- Finished: 2014 May
- Thesis: Attribute-Based Identity Management (more details about the thesis and
the defence here)
- Title: Identity Management for Mobile Devices within the Sentinels (link) research program.
- Supervisor: Jaap-Henk Hoepman (link)
- Promoter: Bart Jacobs (link)
Activities
2015
- Symposium: The Bermuda Triangle of Identity Technologies. January 15.
Organiser (flyer).
2013
- ABC Technology Workshop at the IFIP Summer School 2013. Organiser.
(link)
- Research and development at the IRMA (I Reveal My Attributes) pilot project:
Attribute-based credentials in practice. (link)
- CYRCLE Crypto Club. Organiser. (link)
- Member researcher at the PI.lab - Privacy & Identity Lab
interdisciplinary research. (link)
2012
- RFIDSec 2012, Nijmegen, The Netherlands. Webmaster and a member of the Organizing
committee. (link)
Talks, events
2019
2018
- Open Maths at the Open University (November 24, 2018, Workshop Informatica studiedag organised by the Department of Computer Science of the Open University, The Netherlands
- Open Maths (November 8, 2018, Workshop Skills for Jobs in the Digital Era organised by the Digital Enlightenment Forum
- Open Maths Course 2018 (September 10, 2018, Thalia lunch colloquium organised by the Study Association Thalia
- Authentication with Privacy and Security: the maths behind attribute-based credentials (August 25 and September 1, 2019, Vakantiecursus, Platform Wiskunde Nederland). The syllabus and the problems (with solutions) can be downloaded.
2017
- The Alphabet of ABCs (April 4, 2017, OUrsi talk at the Open Universiteit)
(pdf, 2.1MB)
2016
- Privacy and the P&I Course (January 29, 2016, lunch colloquium at our Digital Security group)
(pdf, 4.3MB)
- Privacy with Attributes, invited talk (January 19, 2016, Software Improvement Group)
(pdf, 3.7MB)
2015
- IRMA: Attribute-Based Identity Management Using Smart Cards (June 4, 2015, Šibenik, Croatia: Summer school on real-world crypto and privacy, invited talk,
link)
- ABCs in Theory and Practice (June 23, 2015, New York, NY, USA: RFIDsec 2015, invited talk, link)
Older tutorials, presentations
- Anonymous Credentials @ Collis, 2011
(link)
- Zero-Knowledge Proofs in Anonymous Credential Systems @ Radboud University,
Digital Security Group, 2011 (link)
Reviews
2021
2020
- CRYPTO 2020 (link)
- Open Education Studies (link)
- CSERC 2020 (link)
2017
- Financial Cryptography and Data Security 2017 (link)
2016
2015
2014
- Pervasive and Mobile Computing - Elsevier Journal (link)
- OID_2014 (link)
- IFIP SEC 2014 (link)
2013
2012
- CARDIS 2012 (link)
- PASSAT 2012 (link)
- International Journal of Information Security, Special Edition for ACNS 2011 (link)
- IFIP SEC 2012 (link)
- MOBISEC 2012 (link)
- WISTP 2012 (link)
2011
2010
Personal
Hobbies
- Learning
- Meditating
- Talking to people
- Playing the piano
- Traveling
- Flying Cessna-150 (link to the club
I got my PPL from - HUN; and a passionate picture)
Recommended links
- Learn more about the exciting, cutting-edge IRMA technology. It's now available on Android smart phones! (link)
- De Open Universiteit Master Software Engineering kreeg voor het derde jaar op rij het predicaat topopleiding, ook op een gedeelde eerste plaats met een zeer hoge score van 96 punten. Daarmee staat de Master SE op een gedeelde vierde plaats van alle Masters van Nederland (alle vakgebieden).
- Cyber Security Bachelor in our group at the Radboud University (first in the Netherlands!) (link)
Last modified: 21 May 2021