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Application & OT Security · Advanced

DNP3 Secure Authentication (DNP3-SA)

An extension to DNP3 that authenticates critical messages using HMAC-based challenge-response and session keys.

Definition

DNP3-SA (version 5 in IEEE 1815-2012, with later updates) ensures that control commands come from authorized masters and have not been altered, but it does not encrypt traffic. Key management and device support have slowed adoption.

Example

An RTU challenges an operate command and verifies the master's HMAC before tripping a breaker.

Exam tip

Provides authentication and integrity, not confidentiality.

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