D3-DNL
Directional Network Link
Definition
Enforce one-way network communication by preventing two-way communication.
How it works
Using a device such as a data diode, or otherwise enforcing unidirectional (one-way) network communication / data transfer, to physically prevent signals from traveling in the reverse direction.
Unidirectional network link enforcement is a security measure used to separate control and safety systems in operational technology (OT) environments. By employing physical data diodes, this approach ensures one-way communication, allowing information from safety systems to be viewed without permitting any modification or interference, thereby protecting the integrity of the safety system.
Artifact Relationships
This defensive technique relates to specific digital artifacts.