AC-4(4)—Flow Control Of Encrypted Information
HIGH
>Control Description
Prevent encrypted information from bypassing ⚙organization-defined information flow control mechanisms by ☑decrypting the information; blocking the flow of the encrypted information; terminating communications sessions attempting to pass encrypted information; [Assignment: organization-defined procedure or method].
>Cross-Framework Mappings
>Programmatic Queries
Beta
Related Services
AWS Network Firewall
AWS WAF
Amazon VPC
CLI Commands
List network firewall policies with TLS inspection
aws network-firewall list-firewall-policies --query 'FirewallPolicies[].{Name:Name,Arn:Arn}'Describe TLS inspection configuration
aws network-firewall describe-tls-inspection-configuration --tls-inspection-configuration-arn TLS_CONFIG_ARNCreate TLS inspection configuration
aws network-firewall create-tls-inspection-configuration --tls-inspection-configuration-name tls-inspect --tls-inspection-configuration file://tls-config.jsonList WAF rules for encrypted traffic inspection
aws wafv2 list-web-acls --scope REGIONAL --query 'WebACLs[].{Name:Name,Id:Id}'>Supplemental Guidance
Flow control mechanisms include content checking, security policy filters, and data type identifiers. The term encryption is extended to cover encoded data not recognized by filtering mechanisms.
>Related Controls
>Assessment Interview Topics
Questions assessors commonly ask
Process & Governance:
- •What formal policies and procedures govern the implementation of AC-4(4) (Flow Control Of Encrypted Information)?
- •Who are the designated roles responsible for implementing, maintaining, and monitoring AC-4(4)?
- •How frequently is the AC-4(4) policy reviewed and updated, and what triggers policy changes?
- •What training or awareness programs ensure personnel understand their responsibilities related to AC-4(4)?
Technical Implementation:
- •Describe the specific technical mechanisms or controls used to enforce AC-4(4) requirements.
- •What automated tools, systems, or technologies are deployed to implement AC-4(4)?
- •How is AC-4(4) integrated into your system architecture and overall security posture?
- •What configuration settings, parameters, or technical specifications enforce AC-4(4) requirements?
Evidence & Documentation:
- •What documentation demonstrates the complete implementation of AC-4(4)?
- •What audit logs, records, reports, or monitoring data validate AC-4(4) compliance?
- •Can you provide evidence of periodic reviews, assessments, or testing of AC-4(4) effectiveness?
- •What artifacts would you present during a FedRAMP assessment to demonstrate AC-4(4) compliance?
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