AC-4(12)—Data Type Identifiers
>Control Description
When transferring information between different security domains, use ⚙organization-defined data type identifiers to validate data essential for information flow decisions.
>Cross-Framework Mappings
>Supplemental Guidance
Data type identifiers include filenames, file types, file signatures or tokens, and multiple internal file signatures or tokens. Systems only allow transfer of data that is compliant with data type format specifications. Identification and validation of data types is based on defined specifications associated with each allowed data format.
The filename and number alone are not used for data type identification. Content is validated syntactically and semantically against its specification to ensure that it is the proper data type.
>Assessment Interview Topics
Questions assessors commonly ask
Process & Governance:
- •What formal policies and procedures govern the implementation of AC-4(12) (Data Type Identifiers)?
- •Who are the designated roles responsible for implementing, maintaining, and monitoring AC-4(12)?
- •How frequently is the AC-4(12) policy reviewed and updated, and what triggers policy changes?
- •What training or awareness programs ensure personnel understand their responsibilities related to AC-4(12)?
Technical Implementation:
- •Describe the specific technical mechanisms or controls used to enforce AC-4(12) requirements.
- •What automated tools, systems, or technologies are deployed to implement AC-4(12)?
- •How is AC-4(12) integrated into your system architecture and overall security posture?
- •What configuration settings, parameters, or technical specifications enforce AC-4(12) requirements?
Evidence & Documentation:
- •What documentation demonstrates the complete implementation of AC-4(12)?
- •What audit logs, records, reports, or monitoring data validate AC-4(12) compliance?
- •Can you provide evidence of periodic reviews, assessments, or testing of AC-4(12) effectiveness?
- •What artifacts would you present during a FedRAMP assessment to demonstrate AC-4(12) compliance?
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