Buyer's Guide
How to Choose a Post-Quantum Readiness & Crypto Inventory Tool (2026 Buyer's Guide)
Compare the four approaches to building a cryptographic inventory for post-quantum readiness in 2026 — pros, cons, a buyer's checklist, and where to start.
How to Choose a Post-Quantum Readiness & Crypto Inventory Tool (2026 Buyer's Guide)
You can't migrate cryptography you can't see. Before any organization moves toward NIST's post-quantum standards, it needs a cryptographic inventory — a clear picture of which algorithms, certificates, and TLS versions are actually in use. Yet a 2025 ISACA study found roughly 5% of organizations have a defined quantum strategy and about 95% lack a roadmap, and a DigiCert study found only 5% of enterprises have quantum-safe encryption in place while 69% already recognize the risk. The gap isn't awareness — it's visibility. This guide compares the practical approaches to building that inventory in 2026, so you can pick the one that fits your situation and budget.
Why a crypto inventory is now the first deliverable
The standards to migrate toward are settled. On August 13, 2024, NIST finalized FIPS 203 (ML-KEM, formerly Kyber), FIPS 204 (ML-DSA, formerly Dilithium), and FIPS 205 (SLH-DSA, formerly SPHINCS+). FIPS 206 (FN-DSA, formerly Falcon) is still in progress in 2026, and HQC was selected in March 2025 as a backup KEM with finalization ongoing.
The deadlines are real too. NSA's CNSA 2.0 timeline asks web servers and cloud services to prefer post-quantum algorithms by 2025 and use them exclusively by 2033, networking equipment to prefer by 2026 and go exclusive by 2030, and software/firmware signing to be exclusive by 2030 — and from January 1, 2027, new National Security Systems acquisitions must support CNSA 2.0. Compliance frameworks already require the inventory itself: PCI DSS 4.0 Requirement 12.3.3 mandates a documented cryptographic inventory and a migration plan for deprecated algorithms (its future-dated controls took effect March 31, 2025), DORA (effective January 17, 2025) requires financial entities to manage ICT risk including crypto-agility, and NIS2 pushes "state-of-the-art" encryption with readiness to upgrade.
And the urgency is grounded in "harvest now, decrypt later" (HNDL): adversaries can collect encrypted long-lived data today and decrypt it once a cryptographically relevant quantum computer (CRQC) exists. The Global Risk Institute's 2025 quantum threat timeline puts the median expert estimate for a CRQC at roughly 2029–2032, with about a 34% probability by 2030. Mosca's theorem frames the decision cleanly: if your migration time plus your data's security shelf-life exceeds the time until a CRQC, your data is already at risk. The inventory is what tells you where that exposure lives.
The four approaches to building a crypto inventory
There is no single "best" tool — there are four broad approaches, each with a different trade-off between depth, speed, safety, and cost. Most mature programs end up combining more than one over time.
1. Manual / spreadsheet inventory
You survey teams, pull certificate lists, and record algorithms in a spreadsheet or GRC tool by hand. It's flexible and effectively free, and it forces useful conversations across teams. But it's slow, quickly goes stale, and depends on people remembering systems they may have forgotten — which is exactly how shadow certificates and legacy services get missed.
2. Agent- or network-based internal discovery
You deploy agents on hosts or run network scanners inside your environment to detect cryptographic libraries, keys, and protocols in use. This sees deep internal detail a spreadsheet never will. The cost is operational: agents to deploy and maintain, change-management approvals, scanning windows, and care to avoid disrupting production systems.
3. Full CBOM / crypto-discovery platforms
These platforms aim to produce a comprehensive Cryptographic Bill of Materials (CBOM) by scanning source code, binaries, and traffic to enumerate every cryptographic asset and its dependencies. They offer the most complete picture and are well-suited to large, regulated estates. In exchange, they tend to require the heaviest integration, the longest deployment, and the largest budget.
4. External, metadata-only readiness scanning
You scan the domains you own or are authorized to assess from the outside — inventorying public TLS certificates, TLS versions, DNS exposure, public-key algorithms (RSA/ECC), and HTTP security headers — without touching internal systems. It's fast, non-intrusive, and gives you an outside-in view of what attackers and partners can already see. Its limit is scope: it maps your internet-facing posture, not internal-only services, so it's a starting point rather than a complete CBOM.
Honest pros and cons
| Approach | Best for | Pros | Cons | |---|---|---|---| | Manual / spreadsheet | Small estates, getting started | Free; flexible; drives cross-team conversation | Slow; goes stale fast; misses forgotten/shadow systems | | Agent / network internal discovery | Deep internal asset detail | Sees internal libraries, keys, protocols; thorough | Agents to deploy & maintain; change approvals; can disrupt production | | Full CBOM / crypto-discovery platform | Large, regulated enterprises | Most complete inventory; code + binary + traffic coverage | Heaviest integration; longest time-to-value; highest cost | | External metadata-only scanning | Fast first picture; ongoing monitoring | Fast; safe/non-intrusive; outside-in view; low barrier to start | Internet-facing scope only; not a full internal CBOM |
What to look for: a buyer's checklist
Whatever approach you start with, evaluate any tool or method against these criteria.
- Breadth of coverage. What does it actually find — just certificates, or TLS versions, public-key algorithms (RSA/ECC), DNS exposure, and security headers too? Does it cover the surfaces that matter most to your risk?
- Time-to-first-result. How long until you have something useful in hand? A picture in minutes beats a perfect inventory that takes a quarter to stand up, especially when you need momentum.
- Executive and board reporting. Can it translate technical findings into a score and a report leadership can act on? Inventory data only drives funding when you can present cryptographic risk to the board in plain terms, and when it feeds directly into building your migration plan.
- Safety: non-intrusive vs intrusive. Does it require credentials, agents, or active probing of production — or is it read-only and metadata-only? Non-intrusive methods are far easier to authorize and won't risk an outage.
- Crypto-agility tracking over time. A one-time snapshot ages immediately. Look for scheduled, repeatable scanning so you can watch posture improve as you migrate — crypto-agility is a continuous discipline, not a single audit.
- Vendor and supply-chain assessment. Your exposure includes third parties. Can the approach help you assess vendors, or pair with a structured vendor PQC questionnaire to cover the supply chain you don't control?
- Price and accessibility. Can you get a first result without a procurement cycle? The ability to start free or cheaply lowers the barrier to actually beginning — which, given how few organizations have started, is the real obstacle.
See where your organization stands — run a free CipherReady readiness scan and get a cryptographic inventory of your public TLS, certificates, and algorithms in about 3 minutes.
Where CipherReady fits
CipherReady sits squarely in the external, metadata-only category — and it's deliberately the first step, not a magic fix. It runs a safe, external scan of domains you own or authorize, inventorying public TLS certificates, TLS versions, DNS exposure, public-key algorithms (RSA/ECC), and HTTP security headers. It is not a vulnerability scanner or pentest: no exploitation, no credentials, no intrusive testing. From that scan it produces a CipherReady Readiness Score, an executive PDF report, AI-assisted summaries, and scheduled monitoring so you can track progress over time rather than relying on a single snapshot.
Against the checklist, that means: fast time-to-first-result (about three minutes), genuinely non-intrusive operation, board-ready reporting out of the box, and built-in crypto-agility tracking through scheduled scans. The free plan includes three scans per month, with paid tiers at Basic $49/mo, Plus $399/mo, and Pro/MSP $1,999/mo (25 users with client management) when you need more scale or to manage multiple clients.
Be clear-eyed about scope, though. External scanning maps your internet-facing cryptographic posture — exactly the part adversaries and partners can already see, and a fast way to surface every public TLS certificate you didn't know you had. It does not, by itself, enumerate internal-only services or replace a full CBOM. The honest recommendation: start with a free external scan to get a real picture in minutes, use the executive report to build internal momentum and funding, and then layer in heavier internal-discovery or CBOM tooling where your estate and compliance obligations demand it.
Frequently Asked Questions
Do I need a full CBOM platform to start PQC readiness?
No. A complete Cryptographic Bill of Materials is valuable, but it's the heaviest and slowest option, and waiting for it is a common reason organizations never begin. Most teams get further faster by starting with a fast, non-intrusive external scan to establish a baseline, then expanding to deeper tooling. Given that 95% of organizations still lack a roadmap, starting beats stalling.
Is an external metadata-only scan safe to run on production domains?
Yes — when the method is genuinely read-only. CipherReady's scan is external and metadata-only: it inventories public TLS, certificates, algorithms, DNS exposure, and headers without exploitation, credentials, or intrusive probing. That's why it can run in about three minutes and is easy to authorize, since it doesn't touch internal systems or risk disruption.
Will a crypto inventory help with PCI DSS 4.0, DORA, or NIS2?
A cryptographic inventory is directly relevant. PCI DSS 4.0 Requirement 12.3.3 mandates a documented cryptographic inventory and a migration plan for deprecated algorithms, DORA requires managing ICT risk including crypto-agility, and NIS2 pushes state-of-the-art encryption with readiness to upgrade. An inventory is the foundational artifact those obligations are built on, though full compliance involves more than any single scan.
How often should I re-scan?
Treat it as continuous, not one-and-done. Certificates rotate, services change, and your migration progresses, so a single snapshot ages immediately. Scheduled monitoring lets you confirm posture is improving over time and catch new internet-facing assets — which is the practical heart of crypto-agility.
Start with visibility — for free
You can't plan a migration you can't measure, and the data says most organizations haven't started measuring. The fastest, lowest-risk way to begin is an outside-in inventory you can run today.
Run a free CipherReady readiness scan to get your Readiness Score, an executive PDF, and an inventory of your public TLS, certificates, and algorithms in about three minutes. Compare plans on the pricing page when you're ready to add scheduled monitoring or manage multiple domains — but start with the free scan, and let the picture guide what tooling you invest in next.