RST Labs Automatic Synthesis of Program- based Triggers for Intrusion Tolerance Mechanisms C C Michael Reliable Software Technologies

RST Labs Objective Triggers for intrusion-tolerance mechanisms Reliable detection of events that intrusion- tolerant systems need to know about Based on system behavior, not the environment (or user behavior). Don’t try to detect the nail that’s about to puncture the tire Based on domain knowledge on how the system should behave

RST Labs Technical Approach Tolerance triggers are synthesized automatically A tolerance trigger has a model of normal system behavior, and watches for deviations from the model. Intelligently model the system, don’t try to model the environment. –Probably won’t use statistical models of behavior Machine learning is used to build system models from automatically-generated training data.

RST Labs Technical Approach Our technical approach contains three main elements: a.Automatic test data generation Create structured tests that exercise as much functionality as possible Observe application behavior while the tests are executed b.Vocabulary extraction c.Synthesis of finite automata that characterize system behavior VE SoFA TDG Behavior Model a b c observe behavior

RST Labs Evaluation Some elements of the system can be used in an LL-style evaluation. Quantifying performance –Begin with a statistical analysis. This assumes a constant operating environment but it may be all we can do without predicting the future. This may help us understand the domain better. –How robust is this to environmental changes?

RST Labs Policy The default policy is: when the system behaves as intended, that’s good. –An analogy between tolerance triggering and fault detection. –“As intended” means whatever the developers put in the code. Extensions for custom policies are possible. –We have some preliminary results

RST Labs Major Milestones Year 1: Completion and evaluation of system for generating structured tests Year 2: Application-specific tolerance triggers Year 3: System-wide tolerance triggers

RST Labs Tech Transfer Patent Inventions Release and make software freely available Market, sell, or license technology to leading commercial vendor in market space.

RST Labs The Tolerance Triggering Team (so far) C C Michael Michael Schatz Automatic Synthesis of Program-based Triggers for Intrusion Tolerance Mechanisms DARPA contract