Adversaries may block a command message from reaching its intended target to prevent command execution. In OT networks, command messages are sent to provide instructions to control system devices. A blocked command message can inhibit response functions from correcting a disruption or unsafe condition.^[1],[2]

References

1. Bonnie Zhu, Anthony Joseph, Shankar Sastry 2011 A Taxonomy of Cyber Attacks on SCADA Systems Retrieved. 2018/01/12
2. Electricity Information Sharing and Analysis Center; SANS Industrial Control Systems 2016, March 18 Analysis of the Cyber Attack on the Ukranian Power Grid: Defense Use Case Retrieved. 2018/03/27

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