Best Practices

Waterfall’s unidirectional technology is recommended by many governmental and regulatory bodies worldwide as best practice in Industrial Control Systems (ICS) and Critical Infrastructure (CI) cyber security. See below for a few examples of a growing list of recommendations.

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Unidirectional gateways limit the propagation of malicious code (ISA SP-99-3-3)

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NEI exempts unidirectional-protected sites from 21 of 26 cyber-perimeter rules

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ANSSI cybersecurity for ICS – many requirements for hardware-enforced unidirectionality

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ENISA – unidirectional gateways provide better protection than firewalls

DHS

DHS recommends unidirectional gateways in security assessments

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Unidirectional gateways limit propagation of malicious code (IEC 62443-3-3)

NRC

NRC exempts unidirectional-protected sites from 21 of 26 cyber-perimeter rules

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NERC-CIP exempts over 35% cyber security requirements when using unidirectional gateways

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