PQC & Quantum Migration • PQ-07
Digital Signature Migration
Protect signatures that must remain verifiable for decades.
Scope
What the engagement covers.
Signatures carry the trust-now-forge-later problem: a signature made today may need to withstand challenge in twenty years. This service migrates signing while preserving verifiability of the historic record.
Included capabilities
- Signing use-case inventory across documents, code, firmware and transactions
- Post-quantum and hybrid signature scheme selection per use case
- Long-term validation, timestamping and archival evidence design
- Code and firmware signing pipeline migration
- Legal and evidential review of signature validity across jurisdictions
Outputs and deliverables
- Signing use-case inventory and custodian register
- Scheme selection rationale per use case
- Long-term validation and archival design
- Migrated signing pipelines with verification evidence
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.
01InventoryEvery signing use case, key custodian, validity need and verifier.
02SelectScheme and size per use case against verifier constraints.
03DesignTimestamping, archival and long-term validation approach.
04MigratePipeline and key rotation with dual-signing transition period.
05AssureVerification testing across the full verifier population.
Use cases
Where this is typically applied.
Legally binding electronic signatures under national law
Software publishers whose signatures gate customer installation
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-04Crypto-Agility Architecture
Design so the next algorithm change is a configuration decision, not a rebuild.
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-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.