FIPS 140-3 How to handle security levels

FIPS 140-3 defines four increasing qualitative security levels, Level 1 through Level 4, for cryptographic modules. The standard applies the levels across requirement areas such as module specification, interfaces, roles and authentication, software and firmware security, operating environment, physical security, non-invasive security, sensitive security parameter management, self-tests, life-cycle assurance, and mitigation of other attacks.

A security-level statement should therefore identify the cryptographic module and the requirement areas or certificate evidence behind the statement. It should not be written as a broad claim that an entire product, platform, tenant, or organization is "FIPS Level 3" unless the public CMVP evidence supports exactly that scope.

Start from the module's intended use, not from a desired marketing label. FIPS 140-3 says the security level must be appropriate for the application and environment in which the module will be used and for the security services it will provide.

For procurement or architecture work, record the use case, exposed environment, cryptographic services, selected module, expected security level, and whether the module is already listed by CMVP for that scope. If the answer depends on a supplier certificate, verify the certificate status and security policy before repeating the level in customer-facing material.

A strong evidence packet links the claim to the CMVP certificate, the module security policy, module version, tested operating environment, cryptographic boundary, approved services, and any CAVP algorithm certificates used by the module. The evidence should also show whether the module is active for the intended procurement or use case.

If the implementation depends on another validated module, document whether the relationship is bound or embedded. CMVP guidance treats those cases differently: a bound existing validated module must be at the same or higher security level as the module under test for all FIPS 140-3 sections except mitigation of other attacks, while an embedded module may be lower only when the submission demonstrates that the higher-level requirements are still met.

The most common mistake is changing the scope of the claim: a validated cryptographic module becomes a validated product, a product becomes a validated service, or an algorithm certificate becomes a module certificate. FIPS 140-3 evidence should keep those layers separate.

Another mistake is copying a supplier's security-level language without checking the exact certificate, module version, operational environment, and validation status. If those details do not match the deployed module, the public claim can be materially misleading even when the supplier has a real validation elsewhere.