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Post-quantum readiness is a technology-lifecycle and cryptographic-migration program—not a bet on when a quantum computer will arrive. CIOs should begin by discovering where public-key cryptography protects business services, prioritizing systems by the lifetime and value of their data, testing migration paths, and making crypto-agility a requirement for technology refreshes and supplier contracts.
Why this belongs on the CIO’s agenda
A sufficiently capable quantum computer could undermine widely used public-key cryptography, including RSA and elliptic-curve systems. That creates a “harvest now, decrypt later” risk: an adversary can capture encrypted information today and try to decrypt it in the future. The exposure matters when data must remain confidential for many years—such as intellectual property, health and financial records, legal archives, industrial designs, identity information, and national-security material. CISA, NIST, and NSA recommend preparing before a cryptographically relevant quantum computer exists: joint agency recommendations.
The business problem is broader than confidentiality. Public-key algorithms also establish identity and sign software, firmware, certificates, and documents. A migration can therefore affect cloud services, customer-facing APIs, VPNs, identity systems, device fleets, code delivery, operational technology, suppliers, and records management. Many organizations cannot yet identify every cryptographic dependency or determine how quickly an affected system can be changed. That visibility gap is an immediate technology-risk problem, regardless of the timing of future quantum capability.
The CIO should sponsor the enterprise program and remove lifecycle and supplier blockers. The CISO should own threat modeling and security policy, while architecture, engineering, procurement, legal, privacy, records, and business owners supply the inventory, testing, contracting, and data-lifetime decisions needed to execute it.
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What post-quantum cryptography changes—and what it does not
Post-quantum cryptography (PQC) consists of algorithms designed to resist attacks from sufficiently capable quantum computers while running on conventional computers. It is not quantum computing, and it is not the same thing as quantum key distribution. Nor does PQC replace symmetric encryption, access control, segmentation, secure development, or sound key management.
NIST has finalized three standards organizations can begin implementing: FIPS 203 (ML-KEM) for key establishment, FIPS 204 (ML-DSA) for digital signatures, and FIPS 205 (SLH-DSA) for digital signatures. ML-KEM helps establish shared secrets used to protect sessions or data keys. ML-DSA and SLH-DSA address signatures used for identity, software trust, and validation. Standards availability does not mean every operating system, cloud service, client, hardware security module (HSM), certificate authority, or application supports them in production. NIST continues to evaluate additional algorithms and backup options: NIST’s standardization project.
Migration is consequently a dependency-management effort, not a product purchase. It touches TLS and other protocols, public-key infrastructure (PKI), certificate authorities, code and firmware signing, VPNs, cloud key-management services (KMS), databases, backups, APIs, messaging, hardware, and embedded devices. Symmetric cryptography and hash functions also merit review, but the near-term transition emphasis is on public-key key establishment and signatures; do not treat all encryption as equally exposed or as needing the same remediation.
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The dates below are a planning framework for private-sector CIOs, not universal legal deadlines. A 2026 federal memorandum sets a useful sequence for U.S. agencies: planning and governance in 2026; pilots and early migration in 2027–2028; prioritized migration of high-value assets and sensitive data in 2028–2030; priority migration of digital signatures in 2031; and remaining work through 2035, subject to risk and commercial availability. Those milestones apply to federal agencies, not automatically to private companies. See the federal implementation memorandum. Sector rules, contracts, customers, and national requirements may create separate obligations.
1. Set the mandate and scope in the first 30–60 days
- Name an executive sponsor, program owner, and decision forum; agree whether delivery is centralized or federated.
- Scope enterprise IT, cloud, suppliers, products, operational technology, and acquired companies rather than limiting the work to corporate networks.
- Ask which information must remain confidential through 2035 or beyond; which systems authenticate people, devices, software, or transactions; and which services cannot be patched, replaced, or recertified quickly.
- Fund initial discovery, testing, and specialist support. Set a rule that new systems should not create avoidable algorithm lock-in.
- Frame the mandate around migration readiness and lifecycle lead times, not a forecast for when a quantum computer will become operational.
2. Discover cryptographic use and dependencies in 2026
NIST’s migration work identifies cryptographic discovery and interoperability testing as central parts of the task: NIST NCCoE migration project. Start with business services and data flows, then map algorithms and suppliers to the systems that depend on them. A useful inventory records:
- Business context: business service, system and owner, data type, secrecy lifetime, criticality, and internet, partner, internal, or offline exposure.
- Cryptographic use: function (key establishment, encryption, signing, authentication, or integrity), algorithm, key and signature sizes, protocol, certificate authority, and key or certificate owner.
- Technical dependencies: application and library, location, HSM or KMS product and version, region or firmware where applicable, clients, load balancers, gateways, and other services in the path.
- Migration facts: vendor, upgrade path and support date, estimated replacement lead time, blockers such as performance or certification, evidence, and accountable owner.
Combine network and TLS scans with certificate-authority records, source-code and binary analysis, software inventories, configuration-management data, cloud and endpoint inventories, HSM/KMS records, firmware lists, vendor questionnaires, and application-owner attestations. A certificate inventory alone is not a cryptographic inventory: it can miss application-level encryption, SSH, VPNs, code and firmware signing, keys embedded in firmware, backup systems, proprietary protocols, third-party SaaS internals, and libraries buried in applications. Scanners can also miss offline or obfuscated systems. Record confidence and evidence, and track unknown dependencies rather than treating an empty result as proof of absence.
3. Prioritize by business risk during 2026–2027
Use a consistent score to compare systems, but let business context decide the ordering. One practical model scores each factor from 1 (low) to 5 (high):
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- How serious would compromise or outage be?
- How exposed is the system, and how directly does it rely on vulnerable public-key cryptography?
- How long will migration, replacement, testing, or certification take?
- How concentrated are dependencies on a supplier or shared platform, and how uncertain is that supplier’s plan?
Sum the scores to create a triage queue, then require executive review for the highest-rated services and any exceptional risk. A system protecting exceptionally long-lived secrets may outrank a high-volume but lower-sensitivity service; an exposed authentication service can also merit early attention even when its data is not retained for decades. Prioritize long-lived sensitive data, public TLS and API gateways, VPNs, identity and certificate authorities, signing systems, high-value transactions, critical infrastructure, long-lived devices, and suppliers with unclear support paths.
4. Set a crypto-agile target architecture in 2026–2028
Crypto-agility means the organization can change algorithms, keys, certificate profiles, and libraries without redesigning every application. NIST’s migration guidance treats agility as a core migration concern: NIST NCCoE migration project. Target architecture should centralize cryptographic policy, use maintained libraries, keep algorithm choices out of business logic where practical, automate certificate issuance and rotation, document key ownership, and make keys and certificates replaceable without code rewrites. Require support for transition profiles, larger messages where relevant, monitoring, and tested rollback.
Hybrid key exchange combines a conventional mechanism such as ECDH with ML-KEM. Federal guidance describes it as a potential defense-in-depth transition pattern, while noting added complexity and resource costs: federal implementation memorandum. Use hybrid deployment only where the protocol and implementation are defined and interoperable, both secrets are combined correctly, clients and network equipment support the profile, performance is measured, and rollback is safe. A hybrid label alone is not proof of security or compatibility.
5. Run controlled pilots in 2027–2028
Choose representative but recoverable services: for example, an externally exposed TLS service, an API using modern libraries, a contained remote-access segment, a noncritical certificate profile, a test code-signing workflow, or a cloud workload with explicit provider support. Test compatibility across clients, certificate chains, HSM/KMS integration, load balancers, firewalls, mobile and legacy clients, and cross-region deployments. Measure handshake success, latency, CPU and memory, packet and certificate size, logging, rotation, revocation, backup and restore, disaster recovery, and rollback time. Include software-signature verification and operational monitoring, not just a successful handshake. NIST’s interoperability work aims to surface compatibility issues in controlled environments before organizations repeat the same testing independently: NIST NCCoE migration project.
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From roughly 2028–2030 in this planning model, target high-priority TLS handshakes, VPN tunnels, API gateways, remote administration, messaging, key wrapping, and database or backup key exchange. Protecting session and data-key establishment is often an early priority because captured traffic can threaten future confidentiality. The federal sequence also places priority key-establishment work before broad signature migration, but a private organization should adapt the order to its own threat model, systems, and supplier capabilities.
7. Plan signature and trust migration, then close the long tail
Signatures have dependencies beyond TLS: certificate authorities, user and device identity, code and firmware signing, secure boot, update mechanisms, package repositories, document signing, timestamping, revocation, and archival validation. Include legal, compliance, and records teams because changing the signing mechanism can affect outside validators and the evidentiary treatment of long-lived records.
Federal technical guidance gives approximate size implications: ML-DSA signatures are around 1–2 KB and SLH-DSA signatures can be tens of kilobytes, with slower signing in some configurations. Those are standard- and configuration-level considerations, not a prediction of a particular product’s performance; measure the actual implementation and use case. Larger signatures can matter for constrained devices, certificates, high-volume signing, and bandwidth-sensitive systems. The same guidance places federal priority signature migration in 2031; treat that as a reference point, not a private-sector mandate.
Through the later migration period, address unsupported operating systems, embedded devices, industrial control systems, archives, acquisitions, supplier-controlled infrastructure, proprietary protocols, and certification-bound systems. For each exception, assign an owner, reason, compensating control, target date, replacement or retirement decision, and accepted residual risk. Retiring an unnecessary application, certificate, API, or VPN can be cleaner than extending its life.
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Choose remediation based on the system, not a slogan
Upgrade, replace, or retire
- Upgrade in place can reduce disruption and retain operational knowledge, but may leave hidden dependencies or difficult certification and rollback work.
- Replace the platform can modernize PKI, automation, and observability, but costs more and can introduce new vendor lock-in or immature support.
- Retire the system removes a dependency outright when the service is redundant, unused, or unsupported.
Hybrid or pure PQC
Hybrid designs can help when controlled interoperability with classical clients is required and a standardized, tested profile exists. They add message size, complexity, and failure modes. A pure PQC profile may suit controlled endpoints where support and performance are proven. Neither approach is a substitute for standards compliance, compatibility testing, or an explicit rollback plan.
Centralized or federated delivery
Use a central schema, risk model, architecture policy, and board dashboard, with federated data owners where business units, geographies, acquired firms, or operational technology have different systems. This preserves comparable reporting without pretending every unit can use the same discovery method.
Buy capability; do not build cryptography
Discovery tools, PKI automation, and migration services can fill skills or scale gaps, particularly for complex estates. Organizations with proprietary protocols or embedded products may need custom inventory and workflow tooling. Avoid implementing cryptographic algorithms yourself; build orchestration, evidence, and reporting around maintained, independently reviewed implementations.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Make supplier commitments specific
A general “quantum-safe” statement is not a migration plan. For major procurements, renewals, and cloud services, ask vendors:
- Which asymmetric algorithms are used, and in which functions, protocols, and product components?
- Which of ML-KEM, ML-DSA, or SLH-DSA are supported, in which versions, deployment models, and regions? Is the capability generally available or experimental?
- Are standardized hybrid profiles supported? Are larger keys, certificates, and signatures handled by all relevant clients and appliances?
- What performance evidence, interoperability results, and required certifications apply?
- What dependencies exist on HSMs, KMS, certificate authorities, browsers, agents, or customer-managed clients?
- What is the dated migration and support roadmap? Will existing keys or certificates need replacement, and can algorithms change without application redesign?
- How are changes to algorithms and protocols communicated, and what are the upgrade, rollback, and support processes?
- Can the customer export cryptographic inventory, keys where permitted, certificates, and policy configuration? What is required to exit?
- Can the supplier provide a cryptographic bill of materials or equivalent dependency disclosure?
Track answers as product- and version-specific delivery dependencies, not as marketing claims. Cloud providers can update managed components, but customers may still own application libraries, certificates, customer-managed keys, custom TLS termination, VPNs, backups, clients, and edge devices. A cloud roadmap does not cover every service or deployment region.
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Measure readiness as risk reduction
A board dashboard should reveal uncertainty and exposure, not just count migrated systems. Useful indicators include:
- Discovery: critical applications with verified inventories; internet-facing services assessed; vendors with documented roadmaps; unknown or unowned dependencies; unsupported or unpatchable systems.
- Risk: sensitive data requiring secrecy beyond 2035; high-value assets using vulnerable key establishment; critical signing systems still dependent on vulnerable algorithms; systems with migration lead times beyond three years; suppliers without committed dates.
- Execution: pilots completed; interoperability failures resolved; critical services with tested rollback; keys or certificates migrated; new systems meeting agility requirements; exceptions past deadline; funded plans for critical services.
- Supplier accountability: supported product version, production status, algorithms and profiles, certification, hardware replacement needs, migration services, support lifecycle, and contractual commitment.
Report denominators and confidence: for example, distinguish “known and assessed” from “not yet discovered.” A rising count of identified dependencies can reflect improved visibility, not worsening security.
Evaluate commercial options by the gap they fill
No single product solves enterprise migration. Compare categories against your inventory and architecture gaps, and verify product version, availability, algorithms, deployment model, interoperability, certification, and contract terms. PQC-specific pricing is commonly quote-based, usage-based, or bundled; there is no useful universal migration price without an asset count, certificate volume, environment, hardware needs, and services scope.
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- Discovery and migration planning: IBM Quantum Safe (vendor page), Keyfactor (PQC solutions), and SandboxAQ (cryptography management) are examples to evaluate for large, complex estates and associated services. Confirm what the tool actually discovers, how it handles custom systems, and what is included in a quote.
- PKI and certificate lifecycle: Keyfactor, DigiCert (quantum-safe TLS), and Entrust (quantum-safe information) address parts of certificate and identity management. Certificate management alone does not find every application, firmware, or proprietary cryptographic dependency.
- Cloud services: consult service-specific PQC information for AWS, Azure, and Google Cloud security. Service availability, region, and pricing differ; a provider’s roadmap is not a substitute for customer inventory.
- Network and edge: Cloudflare SSL and F5 security products are possible evaluation starting points for perimeter and gateway needs. They do not by themselves remediate internal PKI, offline systems, or embedded cryptography.
- HSM and key management: assess suppliers such as Thales, Entrust, Utimaco, Crypto4A, and cloud KMS offerings from AWS, Azure, and Google Cloud. Compare supported profiles, validation, firmware and replacement needs, recovery, interoperability, migration behavior, and audit reporting.
- Specialist components or services: NIST’s migration consortium includes specialist participants such as ISARA, CryptoNext Security, PQShield, QuSecure, Quantum Xchange, Post-Quantum, and SafeLogic: consortium information. Their roles may be libraries, network components, hardware, or services; do not assume any is a complete enterprise platform.
For any shortlist, require a capability matrix tied to your systems, a named algorithm and profile, general-availability status, interoperability evidence, applicable validation, migration and rollback support, and a dated commitment. “Quantum-safe” is not a sufficient acceptance criterion.
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