| Information flow control regulates where information is allowed to travel within an information system and between information systems (as opposed to who is allowed to access the information) and without explicit regard to subsequent accesses to that information.
Specific examples of flow control enforcement can be found in boundary protection devices (e.g., proxies, gateways, guards, encrypted tunnels, firewalls, and routers) employing rule sets or establish configuration settings restricting information system services, provide a packet-filtering capability based on header information, or message-filtering capability based on content (e.g., using key word searches or document characteristics).
Examples of constraints include ensuring: (i) character data fields only contain printable ASCII; (ii) character data fields only contain alpha-numeric characters; (iii) character data fields do not contain special characters; (iv) maximum field sizes and file lengths are enforced based upon organization defined security policy.
This is an information flow requirement. Information flow control applies to applications like a CDS. An AS is not a cross domain solution.
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