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Also known as: Post-quantum Cryptography Approaches
Primary families of post-quantum cryptography include lattice-, code-, multivariate-, isogeny-based schemes, and hash-based signatures.
DESCRIPTION
Post-quantum cryptography (PQC) spans several mathematical families believed to resist quantum attacks. Lattice-based schemes (e.g., Kyber, Dilithium) dominate due to strong security reductions and performance. Code-based cryptography, exemplified by Classic McEliece, offers long-standing security with large keys. Multivariate and hash-based signatures (like SPHINCS+) add diversity and conservative options. Isogeny-based cryptography shows promise but faces evolving cryptanalysis, underscoring the need for agility.
ALTERNATIVE DEFINITIONS
Wikipedia
Post-quantum cryptography (PQC) is the study of cryptographic algorithms (usually public-key algorithms) that are thought to be secure against an attack by a quantum computer.
Defines the overarching field that encompasses the major algorithm families.
NIST
The goal of post-quantum cryptography is to develop cryptographic systems that are secure against both quantum and classical computers and can interoperate with existing communications protocols and networks.
Emphasizes interoperability and the standardization trajectory of PQC approaches.
IETF
The IETF PQUIP WG facilitates the transition of Internet protocols to post-quantum cryptography by identifying and addressing obstacles to deployment.
Focuses on practical deployment of PQC families in Internet protocols.
RELATED TERMS
Post-Quantum Cryptography Lattice-Based Cryptography Code-based Cryptography Multivariate Cryptography Isogeny-Based Cryptography Hash-Based Signatures Kyber Dilithium Classic McEliece SPHINCS+
COMPETING TERMS
RSA Elliptic Curve Cryptography
KNOWLEDGE AREAS
TARGET AUDIENCE
Security Architect Cybersecurity Engineer Chief Information Security Officer Software Developer
EXTERNAL SOURCES
- Wikipedia - Post-quantum cryptography
- NIST - Official PQC project and algorithm selections
- RFC Editor - HPKE RFC enabling hybrid PQC integration
- IETF - IETF working group on PQC deployment
TOP QUESTIONS
What are the Major Approaches in post-quantum cryptography?
Lattice-based, code-based, multivariate, isogeny-based schemes, and hash-based signatures are the principal families under evaluation and standardization.
Category: Basics
Why are lattice-based approaches prominent?
They offer strong security reductions and practical performance, leading to selections like Kyber and Dilithium in standardization processes.
Category: Relevancy
How do code-based schemes compare?
They have a long security history but typically feature large public keys, impacting bandwidth and storage.
Category: Comparison
What is a hot topic among the Major Approaches?
Hybrid key exchange combining classical (e.g., X25519) with lattice-based KEMs to hedge risks during migration.
Category: Topic
What risks exist when choosing an approach?
Cryptanalysis can evolve, especially for newer families. Algorithm agility and upgradability are essential risk mitigations.
Category: Risks
How are these approaches standardized?
NIST leads algorithm selection, while IETF works on protocol integration and interoperability guidance.
Category: Management
What’s misunderstood about the Major Approaches?
That one family fits all use cases; in practice, choices differ for KEMs, signatures, and constrained environments.
Category: Misunderstanding
What are alternatives if a chosen approach weakens?
Use hybridization, maintain crypto-agility, and plan for rapid algorithm replacement via updateable protocols.
Category: Alternatives
Where should engineers start?
Study NIST PQC documentation, evaluate reference implementations, and test hybrid modes in representative environments.
Category: Resources