How CBOM Differs from SBOM and Why It’s Crucial for Industry

A Cryptographic Bill of Materials (CBOM) catalogs an organization’s cryptographic assets, algorithms, keys, certificates, and libraries, while a Software Bill of Materials (SBOM) catalogs software components and dependencies. It matters because SBOM tooling rarely captures how software is secured, only what it’s built from, leaving a compliance and post-quantum migration blind spot. Recommended action: extend your existing SBOM pipeline with CBOM data using CycloneDX 1.6’s native crypto-asset support rather than standing up a separate, disconnected inventory.

Published: August 2025. Updated: August 2026. Reviewed by Encryption Consulting’s Compliance Advisory Team.

For how NIST’s crypto-agility guidance connects directly to CBOM as a prerequisite, see Key Insights from NIST’s Latest Report on Crypto-Agility. For how CBOM-style cryptographic inventory maps to a federal control catalog, see Elevate Your Security with NIST 800-53. For NIS2’s own cryptography-policy requirement that a CBOM helps satisfy, see Everything You Need to Know About NIS2 Compliance.

What Is an SBOM?

A Software Bill of Materials (SBOM) is a detailed record of every software package, library, module, and dependency in an application, including version numbers, licensing details, source repositories, interdependencies, and known vulnerabilities (CVEs). The U.S. 2021 Executive Order on Cybersecurity made SBOMs a requirement for federal software vendors, following a wave of software supply chain attacks where malicious or vulnerable components compromised thousands of systems. SBOM tooling is mature: SPDX and CycloneDX are both well-established, widely adopted formats.

What Is a CBOM?

A Cryptographic Bill of Materials (CBOM) is a structured inventory of every cryptographic asset in an organization’s software and systems: encryption algorithms, digital keys, certificates, crypto protocols, and the libraries implementing them. Where SBOM answers “what software am I running,” CBOM answers “how is that software actually protected,” a question SBOM tooling doesn’t address by default.

How Does CBOM Differ from SBOM?

Feature	SBOM	CBOM
Focus area	Software modules and dependencies	Cryptographic algorithms, keys, certificates, and protocols
Purpose	Track vulnerabilities, licenses, and updates	Secure encryption usage and enforce cryptographic hygiene
Primary users	Developers, DevOps, AppSec teams	Security architects, crypto owners, compliance leads
Sample entries	Apache Struts, Log4j, React	RSA-2048, TLS 1.2, an expired X.509 certificate, a SHA-1 hash
Regulatory relevance	Executive Order 14028, NTIA SBOM specs	PCI DSS 4.0, NIST SP 800-57/175B, CNSA Suite
Tooling maturity	Mature: SPDX, CycloneDX	Standardizing: CycloneDX 1.6 crypto-asset type, ECMA-424, IBM’s CBOM tooling

How Do CBOM Requirements Map to Controls, Owners, and Evidence?

Requirement	Driven by	Control	Owner	Evidence artifact
Inventory cryptographic algorithms in use	PCI DSS 4.0 Requirement 12.3.3; NIST SP 800-175B	Automated cryptographic discovery scanning binaries, TLS configurations, and key stores	Cryptography / security architecture team	Current CBOM export (CycloneDX crypto-asset format)
Track certificate lifecycle	Internal audit; certificate-related outages	Centralized certificate inventory with expiration monitoring	PKI / certificate management team	Certificate lifecycle management platform report
Identify quantum-vulnerable algorithms	PQC migration planning; NIST post-quantum guidance	CBOM tagging of RSA, ECC, and other classically vulnerable algorithms	PQC advisory / cryptography team	PQC readiness assessment referencing the CBOM
Assign cryptographic ownership	Internal governance	A designated Crypto Steward or Cryptography Working Group	CISO / security governance	Governance charter naming the role and its responsibilities

What Are the Implementation Steps for Building a CBOM?

1. Start with high-risk, high-value systems: those handling regulated data, internet-facing, or already under a compliance mandate like PCI DSS or FedRAMP.
2. Extend your existing SBOM pipeline (Syft, OWASP Dependency-Track, or another CycloneDX-based tool) to also emit CycloneDX 1.6’s native crypto-asset component type rather than building a parallel process.
3. Layer in specialized cryptographic discovery for what SBOM extension misses: TLS configuration scans, certificate and key-store inventories, and detection of deprecated algorithms like SHA-1 or RSA-1024.
4. Assign a Crypto Steward or stand up a Cryptography Working Group to own the inventory, define key-lifecycle policy, and respond to crypto-related vulnerabilities.
5. Map the resulting CBOM to your actual compliance requirements: PCI DSS 4.0 Requirement 12.3.3, NIST SP 800-53’s Supply Chain Risk Management family, or your organization’s PQC migration plan.
6. Automate CBOM regeneration inside CI/CD so the inventory reflects the current build, not a point-in-time snapshot from the last manual audit.

What’s the Current State of CBOM Standardization?

CBOM standardization has moved past the “no universal format” stage. CycloneDX 1.6 introduced a native crypto-asset component type, giving CBOM a standardized, machine-readable schema inside the same specification most SBOM tooling already uses. That work has been further formalized through ECMA-424 and CycloneDX’s public Cryptography Registry, and IBM’s CBOM tooling and research (including a paper presented at Eurocrypt 2026) reflect the same convergence toward a common schema. Tooling maturity still trails SBOM’s, but “no standard exists” is no longer an accurate objection to starting.

What Are the Limitations of CBOM Adoption?

• Identifying cryptographic elements is harder than identifying software components; it requires parsing binaries and scanning live infrastructure, not just reading a package manifest.
• Ownership is often unclear. Security, DevOps, engineering, and legal can each plausibly claim a stake in cryptography, and without an explicit Crypto Steward role, CBOM efforts stall on governance rather than tooling.
• A CBOM by itself doesn’t remediate anything; it surfaces the deprecated algorithm or expired certificate, but a separate remediation process still has to act on that finding.
• Even with CycloneDX 1.6’s schema, tooling that automatically detects every cryptographic implementation across legacy binaries, embedded systems, and hardware modules is still maturing.

Audit-Ready Checklist for CBOM Adoption

1. A current CBOM export in CycloneDX 1.6 crypto-asset format covering your highest-risk systems.
2. A named Crypto Steward or Cryptography Working Group with a documented governance charter.
3. Certificate lifecycle tracking integrated with the broader cryptographic inventory, not managed separately.
4. Deprecated-algorithm findings (SHA-1, RSA-1024, and similar) tracked to a remediation owner and timeline.
5. CBOM regeneration automated inside CI/CD rather than produced manually for each audit cycle.

What Would Encryption Consulting Recommend?

Most organizations we talk to have a mature SBOM program and no cryptographic equivalent, which means their PQC migration plan has no actual inventory underneath it. Our CBOM Secure platform builds and automates that cryptographic inventory directly, our PQC Advisory Services use it to sequence a realistic migration plan, and our CertSecure Manager closes the certificate-lifecycle half of the inventory that discovery tools alone tend to miss.

Frequently Asked Questions

Is CBOM just SBOM with more fields?

No. SBOM catalogs software components; CBOM catalogs an entirely different layer, cryptographic algorithms, keys, certificates, and protocols, that most SBOM tooling doesn’t capture without deliberate extension.

Is there a standard schema for CBOM now?

Yes. CycloneDX 1.6 added a native crypto-asset component type, further formalized through ECMA-424 and CycloneDX’s public Cryptography Registry.

Why does CBOM matter for post-quantum cryptography migration?

You cannot replace RSA, ECC, or other classically vulnerable algorithms you haven’t first located. CBOM provides the foundational inventory that any PQC migration plan depends on.

What compliance frameworks reference cryptographic inventory?

PCI DSS 4.0 Requirement 12.3.3, NIST SP 800-57 and 800-175B, and the NSA’s CNSA Suite all reference cryptographic inventory or algorithm-suitability requirements that a CBOM directly satisfies.

Who should own a CBOM inside an organization?

A designated Crypto Steward or Cryptography Working Group, since cryptography ownership without an explicit named role tends to fall between security, DevOps, and engineering with no one accountable.

Need help extending your SBOM pipeline into a working CBOM ahead of your next PQC migration milestone? Talk to Encryption Consulting’s Compliance Advisory team.

References

Cryptography Bill of Materials (CBOM) – cyclonedx.org

ECMA-424 – ecma-international.org

PCI DSS v4 Requirement on CBOM – Encryption Consulting