SC-28(3)—Protection of Information at Rest | Cryptographic Keys
IL5
IL6
>Control Description
Provide protected storage for cryptographic keys ☑[Assignment: organization-defined safeguards; hardware-protected key store].
>DoD Impact Level Requirements
No specific parameter values or requirements for this impact level.
>Discussion
A Trusted Platform Module (TPM) is an example of a hardware-protected data store that can be used to protect cryptographic keys.
>Related Controls
>Assessment Interview Topics
Questions assessors commonly ask
Process & Governance:
- •What policies govern the implementation of cryptographic keys?
- •How are system and communications protection requirements defined and maintained?
- •Who is responsible for configuring and maintaining the security controls specified in SC-28(3)?
- •What is your cryptographic key management policy?
Technical Implementation:
- •How is cryptographic keys technically implemented in your environment?
- •What systems, tools, or configurations enforce this protection requirement?
- •How do you ensure that cryptographic keys remains effective as the system evolves?
- •What encryption mechanisms and algorithms are used to protect data?
Evidence & Documentation:
- •What documentation demonstrates the implementation of SC-28(3)?
- •Can you provide configuration evidence or system diagrams showing this protection control?
- •What logs or monitoring data verify that this control is functioning correctly?
- •Can you demonstrate that FIPS 140-2 validated cryptography is used?
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