ETSI TR 103 966 V1.1.1 CYBER Security (CYBER); Quantum-Safe Cryptography (QSC); Deployment Considerations for Hybrid Schemes

Discusses hybrid cryptography that pairs traditional and post-quantum algorithms for key establishment and digital signatures. The report explains motivations for hybrids, clarifies the terminology, weighs security, efficiency and agility trade-offs, highlights factors in choosing algorithm and parameter combinations, covers deployment and migration issues, and identifies when hybrids should give way to purely post-quantum algorithms. It explicitly does not advise whether hybrids should be used.

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