Post-quantum cryptography: from quantum insight to secure resilience

Replace uncertainty with informed priorities

Four myths hold organisations back from starting their PQC journey today:

They can wait for quantum computing to mature further, not realising the immediate threat ‘harvest now, decrypt later’ poses to their most sensitive data.

PQC programmes require deep quantum expertise which they must build internally first.

Every system needs infrastructure and software replacement, making the challenge overwhelming.

The belief that the PQC challenge will be resolved by vendor patching and updates and they don’t need to do anything.

None are helpful, accurate, or should delay progress. PQC protects classical infrastructure, with some adoption even arriving through routine supplier updates and patches. NCSC advice dated 15 October 2026 recommends beginning migration to post-quantum TLS (TLS 1.3 introduces quantum-resistant key exchange) configurations now.

With that said, complex, mission-critical estates require coordinated discovery, prioritisation and supported migration. Prioritise sensitive, long-lived information: encrypted data harvested today could be decrypted in future. Begin with exposure and business impact, not wholesale replacement.

Global challenge, local guidelines

Quantum risk crosses borders and migration requirements differ. Working closely with colleagues from across the world, while our approach aligns closely to NCSC guidance, our framework is designed to be applied across geographies, with the ability to accelerate in line with government mandates and advice. Organisations operating internationally must account for differing UK, United States, Canadian and European requirements rather than assume one timetable applies everywhere.

Government sets direction and standards bodies establish common foundations. It is our responsibility within industry to make implementation workable. Fujitsu connects research insight, technology partners and operational delivery to build enduring cryptographic risk management with embedded crypto-agility, not award a permanent “quantum-safe” badge.

Make the first step manageable

Effective Post-Quantum Cryptography (PQC) migration requires a combination of understanding quantum computing developments and their implications for security timelines, but more importantly deep networking and cybersecurity expertise.

Fujitsu’s approach follows three connected stages:

Discover and assess

Identify cryptographic dependencies, assess exposure and prioritise systems according to data sensitivity, confidentiality lifetime and business criticality.

Plan and enable

Establish ownership, build a sequenced roadmap, engage suppliers and use demonstrations and proof-of-concept trials to inform migration decisions.

Complete and optimise

Migrate underlying systems and services, then continually review and adapt as technologies, standards and organisational needs evolve.

This iterative and scalable approach turns discovery into practical outputs for risk owners, such as a cryptographic inventory, a risk-ranked migration backlog, supplier dependencies and a sequenced roadmap, allowing organisations to scale delivery to their own size, maturity, architecture and data protection priorities. This dramatically reduces barriers to starting a PQC programme while keeping critical national infrastructure and its supply chains in focus.

The direction is clear: establish ownership, understand exposure and begin a prioritised programme now; once the initial priorities are protected, build resilience through sustained transformation, supported by industry partners for continued guidance and insight.