CLAIR Model Unveils Hidden Cyber‑Physical Dependencies Across Critical Infrastructure

The SANS diary recently published the CLAIR (Critical Infrastructure Layered Analysis and Interdependency Representation) model, which borrows from systems‑of‑systems engineering to create a unified map of how sectors such as energy, water, transportation, and communications rely on one another. By visualizing these links, the model makes it possible to simulate how a cyber‑physical incident in one domain can propagate through the network of essential services, revealing cascade scenarios that were previously hidden in siloed assessments.

For defenders, CLAIR offers a practical framework to prioritize hardening efforts, conduct realistic “what‑if” exercises, and align incident‑response plans across organizational boundaries. Understanding these interdependencies means security teams can anticipate indirect impacts, allocate resources to the most vulnerable junctions, and coordinate with peer sectors before a breach escalates into a broader infrastructure crisis.

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