PQC & Quantum Migration • PQ-04
Crypto-Agility Architecture
Design so the next algorithm change is a configuration decision, not a rebuild.
Scope
What the engagement covers.
The current migration will not be the last. Agility architecture abstracts algorithm choice behind interfaces and policy so future changes do not require touching every application again.
Included capabilities
- Cryptographic abstraction layer and interface standards for developers
- Central algorithm policy with per-context profiles and negotiated fallback
- Key and certificate lifecycle designed for rapid rotation
- Downgrade protection and negotiation failure handling
- Agility testing harness proving an algorithm swap under load
Outputs and deliverables
- Crypto-agility reference architecture
- Algorithm policy and context profile definitions
- Developer library guidance and review standards
- Agility test results from a live algorithm swap
Workflow
How it is delivered, step by step.
Each step has an owner, an entry condition and an artefact that has to exist before the next step begins.
01AssessWhere algorithm choices are currently hardcoded and by whom.
02DesignAbstraction interfaces, policy model and profile structure.
03PilotImplement in one application family and measure the change cost.
04StandardizeDeveloper guidance, libraries and review gates.
05ProveExecute a live algorithm swap as an acceptance test.
Use cases
Where this is typically applied.
Financial institutions with heavy regulatory algorithm constraints
Any organization that has just experienced a forced cipher deprecation
Delivery model
The operating pattern for PQC & Quantum Migration.
The same delivery discipline applies across every capability in this line, so combined engagements stay coherent.
Discover
Find every certificate, key, library, protocol and hardware dependency.
Prioritize
Rank by harvest-now-decrypt-later exposure, data life and migration effort.
Design
Hybrid profiles, agility interfaces, PKI and key lifecycle target state.
Migrate
Waves, pilots, fallback paths, exception handling and change control.
Operate
Posture monitoring, algorithm governance, revalidation and reporting.
Integration
- Certificate lifecycle management and PKI platforms already in place.
- HSM estate, key management services and cloud KMS.
- CI/CD pipelines, so crypto inventory stays current as code ships.
- Asset and configuration management for device and endpoint coverage.
Engagement approach
Most clients begin with discovery and risk mapping as a contained first phase, because nothing else can be planned credibly without an inventory. Migration then runs in waves aligned to certificate renewal and platform refresh cycles rather than as a separate programme.
Related
Other capabilities in PQC & Quantum Migration.
PQ-01
Cryptographic Discovery
You cannot migrate cryptography you cannot find.
PQ-02CBOM / SBOM Enrichment
Extend the software bill of materials until it answers cryptographic questions.
PQ-03HNDL / TNFL Risk Assessment
Rank migration by the data that is already being collected against you.
PQ-05Hybrid PQC Migration
Run classical and post-quantum together until the ecosystem is ready to drop one.
PQ-06PKI Modernization
Rebuild the certificate authority estate so it can issue what comes next.
PQ-07Digital Signature Migration
Protect signatures that must remain verifiable for decades.
PQ-08Secure Communication Migration
Make the channels quantum-safe without breaking the people who use them.
PQ-09IoT / OT PQC Migration
The hardest estate: constrained devices with long lives and no easy update path.
PQ-10PQC Test Lab & Validation
A place to break things before production does it for you.
PQ-11Governance & Reporting
Keep a multi-year cryptographic programme honest between milestones.
PQ-12Training & Capability Transfer
Leave the client able to run the programme without the consultant.