IETF RFC 9794 Terminology for Post-Quantum Traditional Hybrid Schemes

What IETF RFC 9794 Terminology for Post-Quantum Traditional Hybrid Schemes requires

RFC 9794, Terminology for Post-Quantum Traditional Hybrid Schemes, is an Informational document of the IETF stream published in June 2025 by F. Driscoll, M. Parsons and B. Hale. It fixes the vocabulary used across protocol specifications and regulatory guidance for combining post-quantum and traditional cryptography, so that terms such as hybrid, composite and combiner carry one agreed meaning rather than several. It defines a traditional asymmetric cryptographic algorithm as one based on integer factorisation, finite field discrete logarithms, elliptic curve discrete logarithms or related mathematical problems, and a post-quantum asymmetric cryptographic algorithm as one intended to be secure against attacks using quantum computers as well as classical computers. A PQ/T hybrid scheme is a multi-algorithm scheme where at least one component algorithm is post-quantum and at least one is traditional. It further separates composite schemes, exposed as a singular interface of the same type as the component algorithms, from non-composite arrangements, and defines the combiner as the method that takes two or more component algorithms and combines them. Two properties matter for assurance arguments: PQ/T hybrid confidentiality holds as long as at least one component algorithm providing that property remains secure, and PQ/T hybrid interoperability succeeds provided both parties share support for at least one component algorithm. This node is the terminology anchor for hybrid claims made elsewhere in the registry.

Pillar: Aviation, Defense & Quantum · Authority: Internet Engineering Task Force (IETF) · Version: 1.0.0 · Last updated: 2025-06-30

Primary source: https://www.rfc-editor.org/rfc/rfc9794.html

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