CAS-004 Security Engineering Practice Question
A security engineer is designing a system that must protect data at rest on a database server. The organization requires that the encryption keys never leave a hardware module and that the module be resistant to physical tampering. The engineer deploys a hardware security module (HSM) that is validated to FIPS 140-2 Level 3. Which of the following BEST describes the security property provided by this validation level?
⚠ Common exam trap
The trap here is assuming that any HSM automatically provides tamper resistance, when the actual validation level determines the specific physical and authentication protections.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It provides tamper-evident physical mechanisms and identity-based authentication to access cryptographic keys.
FIPS 140-2 Level 3 validation requires tamper-evident physical mechanisms and identity-based authentication, ensuring that keys remain within a hardened hardware boundary and that only authenticated operators can access them. This matches the stated requirements of keys never leaving the module and resistance to physical tampering. Levels 1 and 2 lack these physical protections, while Level 4 adds environmental protections beyond what is needed here.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
It provides zeroization of keys when the module is powered down, but does not require any authentication for administrative access.
Why it's wrong here
FIPS 140-2 Level 3 mandates identity-based authentication for all operator roles, so claiming no authentication is required is incorrect. While zeroization is part of tamper response at Level 3, it is not the sole property, and the absence of authentication would violate the requirement. The scenario requires protection of keys within a hardware module, and authentication is a key control at this level.
- ✓
It provides tamper-evident physical mechanisms and identity-based authentication to access cryptographic keys.
Why this is correct
FIPS 140-2 Level 3 requires tamper-evident mechanisms such as epoxy encapsulation or tamper-detection circuitry that zeroizes keys upon intrusion, and it mandates identity-based authentication for all operators accessing the module. This directly meets the requirement that keys never leave the hardware and the module resists physical tampering. Level 3 is the correct validation level for this scenario because it adds physical security and identity-based authentication beyond Level 2's role-based authentication.
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It provides the highest level of physical security with environmental failure protection and formal method verification.
Why it's wrong here
Environmental failure protection and formal method verification are characteristics of FIPS 140-2 Level 4, not Level 3. Level 4 adds protection against environmental attacks such as voltage and temperature fluctuations, and requires formal method verification of the design. The scenario asks about Level 3, so this option describes a higher level than what is deployed and is therefore incorrect.
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It provides a software-only cryptographic module that can be deployed on any commodity server without hardware dependencies.
Why it's wrong here
FIPS 140-2 Level 3 is not software-only; it requires hardware tamper-evident mechanisms to protect keys. A software-only module without physical protection would typically only meet Level 1, which allows software components with no physical security. The scenario explicitly requires that keys never leave a hardware module and that the module resist tampering, so a software-only approach fails both conditions.
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official CompTIA exam blueprint
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