RFC 9794 is an IETF document that standardizes terminology for post-quantum traditional hybrid schemes. In practice, it gives security teams and vendors a common vocabulary for systems that combine a classic public-key algorithm with a post-quantum one during migration.
This matters because hybrid cryptography is a transition tool: it helps organizations prepare for quantum-resistant security without breaking older clients, proxies, or certificate authorities overnight. Clear terminology reduces confusion in standards work, product documentation, and policy reviews. In defenses, RFC 9794 helps architects specify hybrid certificates, key exchange, and validation behavior precisely. In attacks, ambiguous language can lead to implementation mistakes, such as incomplete validation, mismatched assumptions between components, or a false sense of readiness. The RFC itself does not provide security by itself, but it supports safer deployment by making hybrid designs easier to discuss, compare, and audit.