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Post-Quantum Cybersecurity

Preparing Security for the Post-Quantum Future

A practical, educational overview of how organizations can approach cryptographic readiness in a changing standards environment. This is an educational resource, not a commercial service.

Advances in quantum computing have prompted standards bodies and organizations to begin preparing for a transition to post-quantum cryptography. The work is less about a single switch and more about disciplined preparation: understanding what you have, where the risk lies, and how to migrate without disruption. The four areas below outline a pragmatic readiness path.

01

Cryptographic Inventory

Understanding what cryptographic systems exist across an organization is the essential first step. This includes identifying where public-key cryptography is used, what algorithms are employed, key sizes, and dependencies on cryptographic libraries and protocols.

  • Map all systems using RSA, ECDSA, ECDH, and Diffie-Hellman
  • Document key sizes and certificate chains
  • Identify cryptographic library and protocol dependencies
  • Catalog TLS/SSL implementations and versions
02

Quantum-Risk Assessment

Not all cryptographic applications face the same timeline or severity of quantum risk. Data with long confidentiality requirements faces harvest-now-decrypt-later threats, while authentication systems may have a different risk profile.

  • Identify data with long-term confidentiality needs
  • Assess exposure to harvest-now-decrypt-later threats
  • Weigh authentication versus encryption priorities
  • Consider regulatory and compliance timelines
03

Crypto-Agility

Building systems that can transition between cryptographic algorithms without major architectural changes is increasingly important. Crypto-agility reduces migration risk and enables faster response to emerging threats or standards changes.

  • Design for algorithm abstraction layers
  • Plan for hybrid classical and post-quantum modes
  • Enable certificate and key rotation mechanisms
  • Test migration paths before they are needed
04

Migration Planning

NIST has standardized post-quantum algorithms including ML-KEM (formerly CRYSTALS-Kyber) for key encapsulation and ML-DSA (formerly CRYSTALS-Dilithium) for digital signatures. Planning migration requires understanding these standards and their implementation requirements.

  • Monitor NIST post-quantum standardization progress
  • Evaluate ML-KEM and ML-DSA implementations
  • Phase migration starting with highest-risk systems
  • Coordinate with vendors and supply-chain partners

Research in service of resilience

Post-quantum readiness is part of Black Diamond's broader research into quantum resilience and cybersecurity assurance. To discuss collaboration or learn more about our work, reach out.