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 appr