Runtime Verification Under Access Restrictions

We define a logical framework that permits runtime verification to take place when a monitor has incomplete or uncertain information about the underlying trace. Uncertainty is modeled as a stateful access control proxy that has the capacity to turn events into sets of possible events, resulting in what we call a “multi-trace”. We describe a model of both proxy and monitor as extensions of Mealy machines, and provide an algorithm to lift a classical monitor into a sound, loss-tolerant monitor. Experiments on various scenarios show that the approach can account for various types of data degradation and access limitations, provides a tighter verdict than existing works in some cases, and preserves scalable performance of the model.