How to prove PQC readiness to procurement with a CBOM
As post-quantum mandates like CNSA 2.0 and NIST timeline take hold, buyers and procurement offices are asking a pointed question: can you prove your product is on a path to quantum-safe cryptography? Asserting readiness in a questionnaire is easy and unverifiable. A cryptographic bill of materials (CBOM) — a machine-readable inventory of the cryptography your product uses — turns that assertion into evidence a buyer can actually check.
What a CBOM is
A CBOM extends the software-bill-of-materials idea to cryptography. Using a standard format such as CycloneDX, it enumerates the cryptographic assets in a product — algorithms, key lengths, protocols, certificates and where each is used — so a reader can see exactly what protects what. Where an SBOM answers "what components are in this software," a CBOM answers "what cryptography does it rely on," which is precisely the question a post-quantum reviewer needs answered to assess readiness.
Why sealing it matters
An unsigned CBOM is just a document the supplier could edit — a procurement reviewer has no way to know it reflects the real build or was not tidied up for the audit. Sealing the CBOM with a signature binds the inventory to a specific point in time and a specific signer, and makes any later alteration detectable. The buyer receives evidence they can verify independently rather than a claim they must take on faith, which is the difference between a checkbox and an audit-grade artifact.
Honest scope
A signed CBOM proves what cryptographic inventory was declared, by whom, and that it has not been altered since sealing. It does not by itself prove the inventory is complete or that the running system matches it — that still depends on how the CBOM was generated and on independent verification, so a CBOM is evidence, not a substitute for a security audit. The signature is resistant to known attacks per NIST, not unbreakable. Its value is turning an unverifiable readiness claim into a checkable, timestamped artifact.
Try it yourself — live, free, verifiable in 30 seconds:
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