SI-22—Information Diversity
>Control Description
Identify the following alternative sources of information for ⚙organization-defined essential functions and services: ⚙organization-defined alternative information sources; and
Use an alternative information source for the execution of essential functions or services on ⚙organization-defined systems or system components when the primary source of information is corrupted or unavailable.
>Supplemental Guidance
Actions taken by a system service or a function are often driven by the information it receives. Corruption, fabrication, modification, or deletion of that information could impact the ability of the service function to properly carry out its intended actions. By having multiple sources of input, the service or function can continue operation if one source is corrupted or no longer available.
It is possible that the alternative sources of information may be less precise or less accurate than the primary source of information. But having such sub-optimal information sources may still provide a sufficient level of quality that the essential service or function can be carried out, even in a degraded or debilitated manner.
>Assessment Interview Topics
Questions assessors commonly ask
Process & Governance:
- •What policies and procedures govern information diversity?
- •Who is responsible for monitoring system and information integrity?
- •How frequently are integrity monitoring processes reviewed and updated?
Technical Implementation:
- •What technical controls detect and respond to information diversity issues?
- •How are integrity violations identified and reported?
- •What automated tools support system and information integrity monitoring?
Evidence & Documentation:
- •Can you provide recent integrity monitoring reports or alerts?
- •What logs demonstrate that SI-22 is actively implemented?
- •Where is evidence of integrity monitoring maintained and for how long?
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