| This control applies to communications across internal and external networks. The network element must employ cryptographic mechanisms to recognize changes to information while preparing information for transmission unless the transmission is otherwise protected by alternative physical measures. If connectivity is provided by a commercial service provider rather than a dedicated service, obtaining the necessary assurances regarding the implementation of needed security controls for transmission integrity may not be possible. Without cryptographic integrity controls, information traveling over commercial networks could be altered or compromised during transmission. Therefore, these controls must be obtained from the service provider using appropriate contracting vehicles. If this is not feasible, then the organization will implement physical or logical compensating security controls.
Aggregation and encapsulation of network level traffic is not a function of the firewall, thus this requirement is not applicable. |
