SC-40(4)—Signal Parameter Identification
>Control Description
Implement cryptographic mechanisms to prevent the identification of ⚙organization-defined wireless transmitters by using the transmitter signal parameters.
>Supplemental Guidance
The implementation of cryptographic mechanisms to prevent the identification of wireless transmitters protects against the unique identification of wireless transmitters for the purposes of intelligence exploitation by ensuring that anti-fingerprinting alterations to signal parameters are not predictable by unauthorized individuals. It also provides anonymity when required. Radio fingerprinting techniques identify the unique signal parameters of transmitters to fingerprint such transmitters for purposes of tracking and mission or user identification.
>Related Controls
>Assessment Interview Topics
Questions assessors commonly ask
Process & Governance:
- •What policies govern the implementation of signal parameter identification?
- •How are system and communications protection requirements defined and maintained?
- •Who is responsible for configuring and maintaining the security controls specified in SC-40(4)?
- •What is your cryptographic key management policy?
Technical Implementation:
- •How is signal parameter identification technically implemented in your environment?
- •What systems, tools, or configurations enforce this protection requirement?
- •How do you ensure that signal parameter identification 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-40(4)?
- •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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