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State estimators in power systems are currently used to, for example, detect faulty equipment and to route power flows. It is believed that state estimators will also play an increasingly important role in future smart power grids, as a tool to optimally and more dynamically route power flows. Therefore security of the estimator becomes an important issue. The estimators are currently located in control centers, and large numbers of measurements are sent over unencrypted communication channels to the centers. The authors here study stealthy false-data attacks against these estimators. They define a security measure tailored to quantify how hard attacks are to perform, and describe an efficient algorithm to compute it.
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