SVPost-Quantum Security

Post-quantum security with crypto-agility and rollback.

Inventory cryptography, plan post-quantum migration, assess QKD fit, and produce reviewable quantum-safe evidence for regulated systems.

Security leadership · Regulated enterprises · Critical infrastructure

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Concept quantum-safe infrastructure connecting network equipment, optical links, cryptographic migration, and evidence controls — FIG 01 · QUANTUM-SAFE READINESS · Illustrative service visual — Cryptographic inventory, PQC decisions, specialized QKD boundaries, vendor readiness, pilot status, rollback planning, and review evidence in one programme.

Migration: Wave-based
Artifacts: CBOM + roadmap
Focus: PQC readiness

Modern enterprise data center corridor with high-density server racks — Quantum-safe readiness
Post-quantum migration needs inventory, ownership, vendor evidence, and rollback planning.
Quantum-safe security work connects cryptographic inventory, PQC algorithm choices, QKD boundary assessment, vendor readiness, policy gates, and audit evidence.

Post-Quantum Security reference pathScope model

01input
Estate and dependency evidence
Layer 01
02process
Decision and policy control plane
Layer 02
03process
Interoperability and pilot environments
Layer 03
04output
Lifecycle evidence and operations
Layer 04

Acceptance: Inventory coverage is measurable
Acceptance: Every priority has a traceable rationale
Acceptance: Pilot evidence is reproducible
Acceptance: Rollback and residual risk are exercised

01 · Mission context

Post-quantum migration is an estate-wide change programme, not an algorithm swap.

The standards now exist, but a safe migration still depends on knowing where public-key cryptography is used, how long protected data must remain confidential, which vendors control each dependency, and how a change can be tested and reversed. This service treats PQC as security engineering and keeps it separate from quantum-computing research or QKD infrastructure.

Migration framing

Prioritize trust lifetimes before choosing a pilot.

The first decision is not which post-quantum algorithm to deploy, but which information and trust relationships would remain exposed for the longest time. Cryptographic discovery connects protocols, certificates, keys, signing paths, firmware, libraries, appliances, and suppliers to the systems they protect, the owners who can change them, and the gaps that still require investigation.

P01

Cryptography is hidden across the estate

Decision questionCan every material use of quantum-vulnerable public-key cryptography be tied to a system, protocol, owner, vendor, data class, and replacement path?

P02

Data lifetime changes the priority

Decision questionWhich records, credentials, signatures, and update paths remain valuable or trusted long enough to justify earlier migration?

P03

Interoperability can fail before cryptography does

Decision questionHas the proposed change been measured across the real clients, servers, devices, protocols, trust stores, and constrained links in scope?

P04

Cutover needs a controlled return path

Decision questionCan the team pause, isolate, reverse, and explain each migration step without losing trust continuity or evidence?

Read the mission context

That evidence supports a sequence based on confidentiality lifetime, signature lifetime, service criticality, replacement cycle, vendor readiness, and validation needs. Current standards guide the candidate mechanisms, while real clients, middleboxes, hardware modules, constrained devices, and partner interfaces determine whether a bounded trust boundary is suitable for pilot work.

Cryptography is hidden across the estate. TLS termination, VPNs, PKI, code signing, firmware, identities, backups, libraries, appliances, SaaS products, and partner interfaces may each depend on different algorithms and owners.

Data lifetime changes the priority. A system with long-lived confidential data or long-lived signing trust may need action before a short-retention workload, even when both use the same algorithm today.

Interoperability can fail before cryptography does. Key and signature sizes, handshake behavior, certificate chains, hardware modules, middleboxes, and vendor implementations can break a theoretically correct design.

Cutover needs a controlled return path. A migration without version identity, staged cohorts, compatibility gates, monitoring, revocation, and rollback can turn a security improvement into an availability incident.

02 · Delivery system

Four inspectable work packages.

Inputs, outputs, maturity, and the evidence boundary travel together. Capability is never separated from the condition under which it can be accepted.

Post-Quantum Security & Crypto-Agility delivery pathOverview first; the work-package contract remains directly below.

W01input
Cryptographic dependency discovery
Build a cryptographic bill of materials across applications, infrastructure, devices, data flows, certificates, keys, protocols, libraries, signing systems, and vendor-managed services.
Output · CBOM · ownership map · discovery gaps · system-to-crypto dependency graph
W02process
Risk, standards, and migration prioritization
Score dependencies by data lifetime, signature lifetime, exposure, criticality, replacement cycle, vendor readiness, validation needs, and operational complexity, then map them to current NIST PQC standards and applicable policy.
Output · Priority scorecard · algorithm decision register · exception register · sequenced roadmap
W03gate
PQC and hybrid-mode pilot engineering
Implement a bounded pilot for one complete trust boundary, measure interoperability and resource effects, exercise certificate or key lifecycle behavior, and retain reproducible test evidence.
Output · Pilot build · test matrix · benchmark record · defect register · cutover and rollback evidence
W04output
Crypto-agility and migration governance
Define algorithm and parameter ownership, vendor evidence, release gates, observability, exception handling, revocation, rollback, and periodic inventory refresh so later transitions are less disruptive.
Output · Operating model · RACI · evidence requests · release gates · monitoring and review cadence

Inspect the complete work-package contract4 packages

W01Assessment

Cryptographic dependency discovery

Build a cryptographic bill of materials across applications, infrastructure, devices, data flows, certificates, keys, protocols, libraries, signing systems, and vendor-managed services.

Inputs: Architecture and data-flow records · scans · certificate stores · code and package inventory · device estate · vendor questionnaires
Outputs: CBOM · ownership map · discovery gaps · system-to-crypto dependency graph
Boundary: Automated discovery is not assumed to be complete; findings are reconciled with architecture, procurement, operations, and system-owner review.

W02Assessment

Risk, standards, and migration prioritization

Score dependencies by data lifetime, signature lifetime, exposure, criticality, replacement cycle, vendor readiness, validation needs, and operational complexity, then map them to current NIST PQC standards and applicable policy.

Inputs: CBOM · data classifications · retention rules · threat model · trust anchors · vendor roadmaps · policy obligations
Outputs: Priority scorecard · algorithm decision register · exception register · sequenced roadmap
Boundary: The roadmap is a risk-based engineering recommendation, not a compliance certification or a prediction of when a cryptographically relevant quantum computer will exist.

W03Engineering

PQC and hybrid-mode pilot engineering

Implement a bounded pilot for one complete trust boundary, measure interoperability and resource effects, exercise certificate or key lifecycle behavior, and retain reproducible test evidence.

Inputs: Selected use case · test environment · approved libraries or modules · compatibility matrix · performance and failure budgets
Outputs: Pilot build · test matrix · benchmark record · defect register · cutover and rollback evidence
Boundary: A pilot result applies only to the tested versions and configuration; production cryptographic modules may require separate validation and approval.

W04Engineering

Crypto-agility and migration governance

Define algorithm and parameter ownership, vendor evidence, release gates, observability, exception handling, revocation, rollback, and periodic inventory refresh so later transitions are less disruptive.

Inputs: Change process · IAM and PKI ownership · release controls · supplier contracts · telemetry · incident and recovery plans
Outputs: Operating model · RACI · evidence requests · release gates · monitoring and review cadence
Boundary: Governance artifacts support customer decision-making; legal interpretation, formal accreditation, and production authorization remain with the responsible organization and authorities.

03 · System boundary

Crypto-agility is demonstrated through reversible change.

The migration architecture joins the cryptographic inventory to algorithm decisions, exceptions, test environments, and release evidence. A pilot carries exact versions, parameters, topology, measurements, defects, and compatibility limits, then exercises certificate or key lifecycle behavior under the same configuration proposed for a staged cohort.

Reference layers support scoping. Interfaces, owners, and target-system constraints remain subject to validation.

L01Estate and dependency evidence01

Applications, services, endpoints, devices, trust stores, certificates, keys, algorithms, data classes, and vendors are connected in a versioned inventory.

Typical elements · CBOM · certificate discovery · SBOM linkage · data-flow map · vendor register

L02Decision and policy control plane02

Approved algorithms, allowed hybrid patterns, exceptions, owners, validation status, data-lifetime priorities, and migration gates are managed as reviewable decisions.

Typical elements · Algorithm register · policy-as-code inputs · exception expiry · approval record

L03Interoperability and pilot environments03

Representative clients, servers, HSMs, devices, network paths, protocols, and vendor products are exercised before production cutover.

Typical elements · TLS or IKE lab · PKI test hierarchy · signing pipeline · constrained-device testbed

L04Lifecycle evidence and operations04

Release identity, installation proof, performance, failures, revocation, vendor status, incidents, rollback, and residual risk remain linked throughout migration.

Typical elements · Campaign record · telemetry · key and certificate events · rollback receipt · audit pack

System rationale

Handover defines inventory refresh, supplier evidence, exception expiry, approval, observability, revocation, pause, and rollback responsibilities. The result is a governed migration path whose unknowns remain visible; it is not a declaration that the wider estate, a cryptographic module, or a production service has been certified or fully transitioned.

04 · Assurance dossier

Inspect the operating and acceptance detail when it matters.

The primary story remains calm; profiles, scope, handover evidence, and discovery questions stay available as a structured technical annex.

A1Operating profiles3 contexts

U01

Enterprise TLS and PKI migration pilot

A bounded internal or partner-facing service tests ML-KEM or a standards-aligned hybrid exchange with the actual certificate, proxy, client, observability, and recovery chain.

Primary user: CISO · PKI lead · platform owner · network engineering
Decision: Is this trust boundary ready for a wider staged migration, or which dependency must change first?
Evidence: Dependency map · configuration · handshake and resource results · compatibility defects · rollback test

U02

Firmware and software-signing transition

A device or software programme examines signature lifetime, boot-chain support, package size, verification cost, trust-anchor rotation, and recovery across fielded versions.

Primary user: Product security · device platform · release engineering
Decision: Which signature path and rollout sequence preserve update trust for the supported estate?
Evidence: Device/version matrix · signing and verification tests · trust rotation plan · recovery evidence

U03

Third-party and managed-service readiness

A critical supplier surface is assessed through contract evidence, architecture dependencies, supported algorithms, planned dates, validation posture, and exit alternatives.

Primary user: Procurement · third-party risk · enterprise architecture · service owner
Decision: Is vendor evidence sufficient for the programme timeline, or is mitigation or replacement required?
Evidence: Evidence request · response assessment · dependency criticality · exception owner · contingency path

A2Scope contractincluded / excluded

Included in this service pattern

Cryptographic inventory and dependency mapping for the agreed estate
Risk prioritization and standards-aligned migration decision records
One or more bounded interoperability pilots where agreed
Vendor evidence, crypto-agility, release, monitoring, and rollback design

Not implied by this page

Custom or proprietary cryptographic algorithm design
Blanket compliance, accreditation, or cryptographic-module validation claims
Unapproved production cutover or enterprise-wide key replacement
QKD link engineering unless separately scoped as a specialized research or telecom assessment

A3Acceptance and discovery4 acceptance records

Handover evidence

A01
Inventory coverage is measurable
The CBOM reports systems reviewed, discovery methods, confirmed dependencies, owners, unknowns, and an explicit plan for unresolved coverage.
A02
Every priority has a traceable rationale
Data lifetime, trust lifetime, exposure, criticality, vendor status, standards, validation, and replacement constraints are visible in the decision record.
A03
Pilot evidence is reproducible
A reviewer can identify versions, algorithms, parameters, topology, test data, environment, pass/fail criteria, measurements, defects, and limitations.
A04
Rollback and residual risk are exercised
The pilot demonstrates a monitored pause or reversal path and records what remains exposed, deferred, vendor-blocked, or outside scope.

Discovery questions

Q1Which data, signatures, identities, and devices must remain protected or trusted for the longest period?
Q2Where are TLS, VPN, PKI, signing, firmware, HSM, library, and vendor cryptographic dependencies currently recorded?
Q3Which systems have constrained bandwidth, compute, storage, maintenance windows, or replacement cycles?
Q4Which regulators, internal policies, validation programmes, and supplier commitments shape the migration?
Q5What is the smallest complete trust boundary where interoperability, observability, revocation, and rollback can be tested safely?

Technical termsExpand the abbreviations used on this page.5 definitions

CBOM: Cryptographic bill of materials. An inventory linking cryptographic algorithms, keys, certificates, libraries, protocols, hardware, suppliers, and owners to the systems that depend on them.
PKI: Public key infrastructure. The roles, policies, certificates, keys, and services used to establish and manage digital trust.
PQC: Post-quantum cryptography. Classical cryptographic algorithms designed to resist attacks from both conventional and sufficiently capable quantum computers.
QKD: Quantum key distribution. A physical-layer method for establishing key material whose fit depends on topology, hardware, operations, and the surrounding classical security system.
SWaP: Size, weight, and power. A compact way to describe physical and energy constraints that strongly shape deployable edge and sensing systems.