SC-11(1)—Irrefutable Communications Path
>Control Description
a
Provide a trusted communications path that is irrefutably distinguishable from other communications paths; and
b
Initiate the trusted communications path for communications between the ⚙organization-defined security functions of the system and the user.
>Supplemental Guidance
An irrefutable communications path permits the system to initiate a trusted path, which necessitates that the user can unmistakably recognize the source of the communication as a trusted system component. For example, the trusted path may appear in an area of the display that other applications cannot access or be based on the presence of an identifier that cannot be spoofed.
>Assessment Interview Topics
Questions assessors commonly ask
Process & Governance:
- •What policies govern the implementation of irrefutable communications path?
- •How are system and communications protection requirements defined and maintained?
- •Who is responsible for configuring and maintaining the security controls specified in SC-11(1)?
Technical Implementation:
- •How is irrefutable communications path technically implemented in your environment?
- •What systems, tools, or configurations enforce this protection requirement?
- •How do you ensure that irrefutable communications path remains effective as the system evolves?
Evidence & Documentation:
- •What documentation demonstrates the implementation of SC-11(1)?
- •Can you provide configuration evidence or system diagrams showing this protection control?
- •What logs or monitoring data verify that this control is functioning correctly?
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