The Hybrid State-of-Play: How to Securely Combine Quantum and Classical Key Establishment Technologies

Beschreibung

Hybrid Authenticated Key Establishment (HAKE) use conventional, post-quantum, and quantum-based key material to establish an authenticated and confidential channel even in the event of cryptographically relevant quantum computers. Notably, such mechanisms can be fault-tolerant and versatile, meaning that even if all-but-one of the components fail or are turned off, the channel is still authenticate and confidential resulting in several options for a quantum-secure combina tion of key establishment technologies adjustable to specific use cases.

Hybrid approaches are particularly motivated by a recent regulation and
a roadmap in Europe. Concretely, in March 2023, the European Parliament and the Council published Regulation (EU) 2023/588 "Establishing the Union Secure Connectivity Programme for the period 2023-2027," which specifically mentions that a so-called hybrid approach combining conventional cryptographic solutions, PQC and possible Quantum Key Distribution (QKD) should be followed.3 Moreover, in April 2024, the European Commission published the Commission Recommendation (EU) 2024/1101 on a Coordinated Implementation Roadmap for the transition to PQC where hybrid approaches combining conventional cryptography with PQC or QKD were echoed.

This talk sheds light on recent developments around such versatile
hybrid approaches from the following angles:
– Motivation of authenticated hybrid key establishment in the transition to quantum-safe networks via (European) policies,
– Latest development in HAKE protocols covering Muckle, Muckle+,
Muckle# (including recent works by the authors) achieving the important guarantees of forward and post-compromise security,
– Implementation and standardization efforts in terms of authenticated hybrid key establishment,
– Outlook and future works.

Zeitraum	4 Mai 2025
Ereignistitel	44th Annual International Conference on the Theory and Applications of Cryptographic Techniques - EUROCRYPT 2025 Affiliated Events
Veranstaltungstyp	Konferenz
Ort	Madrid, SpanienAuf Karte anzeigen
Bekanntheitsgrad	International