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Symposium Series on Post-Quantum Cryptography

Post-Quantum Cryptography

Cryptography is at the heart of internet security. However, much of the currently deployed cryptography is vulnerable to quantum attacks, which will become effective once large-scale quantum computers become feasible. Therefore, the affected cryptographic standards must be replaced by ones that offer security against quantum attacks. The post-quantum cryptography transition may take organizations ten years to complete, or longer. To remain secure and comply with legal and regulatory requirements, affected organizations should act now. What do you need to know - and what can you do - in order to continue your course of business securely?

Symposium Series

The Symposium Post-Quantum Cryptography is part of a series organized by CWI Cryptology Group and TNO. The symposium is aimed at higher management and security professionals from government, private sector, and industry. The first symposium in April 2021 was a general introduction to the problem from the perspective of industry, government, and end user. The second episode of November 2021 zoomed in on a number of specific topics, including quantum-safe PKI, the relation between PQC and QKD, and PQC standards & implementation. The third symposium in April 2022, showed the insights of “Early Movers from industry and government that are working on quantum-safe products, and are aware of the latest developments. The fourth symposium in November 2022 marked the start of the ``Maiden Voyage'' after the first standards had been selected during the summer of 2022 and had leading researchers behind these standards explain them, whereas industrial players at the forefront of PQC-migration described the consequences of these standards for their cryptographic products.

Symposium Post-Quantum Cryptography - Episode V

Theme:  Act now, not later: "Charting the Voyage"
Date and time:  Tuesday June 13, 2023
Location:  Openbare Bibliotheek Amsterdam (OBA) Congres, Oosterdokskade 143, 1011 DK, Amsterdam


Our fifth symposium on Tuesday, June 13, 2023 focuses on "Charting the Voyage" and initiates a more fine-grained, detailed view on PQC-migration. Central to this view is the notion of "personas", i.e., an organization's required actions depend on the nature of its (business) operations. Speakers from the public sector, industry and academia representing various personas will cast their views on migration, either from a process management, policy or technical perspective.


10:00 - 10:30 Walk in with coffee and tea
10:30 - 10:35Welcome by Chris van 't Hof
10:35 - 11:15Ward van der Schoot (TNO) & Marc Stevens (CWI Cryptology Group):
The PQC Migration Handbook (abstract) (slides)
Abstract:  The urgency to migrate to PQC is clear, and the required solutions are ready to be implemented. This begs the question: how do organisations implement these solutions in practice? AIVD, CWI and TNO have developed a handbook bridging this gap between urgency and technology. Central in the handbook are the so-called PQC personas, which offer a way of giving advice tailored to each organisation specifically. By containing both general strategies as well as detailed action steps, the handbook forms an excellent stepping stone towards starting the PQC migration.
11:15 - 11:50Sterre:
Use of Cryptography in Operational Technology (abstract) (slides)
Abstract:  Making your IT quantum safe is hard? Try OT! For good reasons, Operational Technology (OT) needs to be quantum safe. A lot is being said on PQC migration for your IT environment. Unfortunately, not all recommendations that are given for IT migrations hold for OT migrations due to their differences. This talk will first cover a short introduction on OT and why it differs from IT, the use of cryptography in OT and how to get to a quantum safe OT environment. Last, two research projects on quantum safe OT will be discussed.
11:50 - 12:35Maurice Heymann (Continental) & Ayoub Mars (Elektrobit):
Post-Quantum Cryptography for Automotive (abstract) (slides)
Abstract:  This talk will introduce automotive cybersecurity regulation and how it relates to the quantum threat, showing the migration urgency to quantum safe for all what relates to product lifecycle in the automotive sector. The talk will cover security in vehicle and ECU levels, the use of cryptography in selected use-cases and the associated requirements. We will share PQC migration challenges in the automotive sector. Finally, we will present a demonstrator showing runtime differences between PQC and classical cryptographic algorithms implementation on an automotive SoC.
12:35 - 13:30Lunch
13:30 - 14:30Stefan Kölbl (Google):
Post-quantum Cryptography at Google (abstract) (slides)
Abstract:  Google is actively involved in the development and deployment of post-quantum cryptography (PQC). In this talk, we will share our perspective on the migration to PQC, including our priorities, our challenges, and our progress. As an example we will show how we transitioned Google’s internal protocol for transport layer security (ALTS) to use post-quantum cryptography. We will also discuss how carefully designed cryptographic libraries can enable cryptographic agility and ease the migration to PQC. By sharing our perspective on the migration, we hope to help others to prepare for this important transition.
14:30 - 15:10Frans van Dorsselaer (Fox Crypto):
Production ready XMSS (abstract) (slides)
Abstract:  A production ready XMSS library was developed under the Dutch "National Crypto Strategy" (NCS), aiming to speed up the development of first class information security products, stimulating R&D in the crypto field, and strengthening collaboration between government, companies and academia. The library has been published online, free for all to use, on Fox Crypto has developed the library with several practical scenarios in mind. This led to corresponding design decisions as well as the addition of novel security ideas. These will be presented in detail.
15:10 - 15:25Break
15:25 - 15:55Panel discussion
15:55 - 16:00Wrap up
16:00 -Drinks and bites


photo chris

   Chris van 't Hof
Chris van ’t Hof is an independent researcher, writer and presenter in information technology. With his background in both electrical engineering and sociology, he analyses the interaction between human and electronic networks. With his company Tek Tok, he makes complicated matters in science and technology fun. Since January 2022, he is director of DIVD, the Dutch Institute for Vulnerability Disclosure.


photo thomas    Ward van der Schoot
Ward van der Schoot is a scientist in Quantum Applications & Security at TNO. His research focusses on the potential applications of quantum computers, as well as ways of mitigating their threats through post-quantum cryptography.

photo marc

Marc Stevens
Marc Stevens is researcher at the Cryptology Group at CWI. His research focuses on cryptanalysis of hash functions and post-quantum cryptography.

photo sterre

Sterre is advisor at the Dutch Government.

photo maurice Maurice Heymann
Maurice Heymann works at Continental as an Applied Researcher focusing on Applied Cryptography within the Product Cybersecurity Office.

photo ayoub

Ayoub Mars
Ayoub is a senior cybersecurity expert at Elektrobit, Germany. He received his Dr.-Ing. degree in Electrical and Computer Engineering from the Technical University of Braunschweig, Germany. His research focusses on cryptography, embedded security, and automotive cybersecurity.

photo stefan

Stefan Kölbl
Stefan is a staff security engineer and cryptographer at Google, Switzerland. He is responsible for the cryptographic library Tink, security reviews, and cryptographic consultations across all product areas, with a focus on guiding Google’s transition to post-quantum cryptography. Stefan co-designed several cryptographic algorithms, including SPHINCS+ (winner of the NIST PQC competition) and Skinny (ISO/IEC 18033-7). He received his Ph.D. from the Technical University of Denmark in 2016. His area of research deals with the design and analysis of symmetric key cryptographic algorithms.

photo frans

Frans Van Dorsselaer
Frans is Principal Architect at Fox Crypto. Fox Crypto develops high assurance products that protect top secret information against the highest level of attackers, including APTs such as state actors with a high knowledge level and virtually unlimited resources. Their solutions also focus on physical attacks, where attackers have access to one or more devices. This means that besides the mathematical soundness of the cryptographic functionality, the physics of the implementation is equally important. Their contribution highlights some of the practical obstacles modern cyber security solutions face when dealing with the most advanced adversaries. Fox Crypto is part of Fox-IT, which in turn is part of NCC Group.


The Symposium Post-Quantum Cryptography requires registration. For more information, please contact: projectoffice (AT) More information on previous editions can be found here.

Organizing Committee

  • Ronald Cramer (CWI & University Leiden)
  • Serge Fehr (CWI & University Leiden)
  • Maran van Heesch (TNO)
  • Marc Stevens (CWI)
  • Thijs Veugen (TNO & CWI)
  • Susanne van Dam (CWI)
  • Lenny Zilverberg (TNO)
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