Deciding branching hyperproperties for real time systems.
- Event Type
- Seminar/Symposium
- Sponsor
- PL/FM/SE area-wide
- Location
- 0222 Siebel Center and Zoom
- Virtual
- Join online
- Date
- Sep 20, 2024 2:00 - 3:00 pm
- Speaker
- Nabarun Deka
- Contact
- Kristin Irle
- kirle@illinois.edu
- Phone
- 217-244-0229
- Views
- 141
Security properties of real-time systems often involve reasoning about hyper-properties, as opposed to properties of single executions or trees of executions. These hyper-properties need to additionally be expressive enough to reason about real-time constraints. Examples of such properties include information flow, side channel attacks and service-level agreements. In this paper we study computational problems related to a branching-time, hyper-property extension of metric temporal logic (MTL) that we call HCMTL*. We consider both the interval-based and point-based semantics of this logic. The verification problem that we consider is to determine if a given HCMTL* formula is true in a system represented by a timed automaton. We show that this problem is undecidable. We then show that the verification problem is decidable if we consider executions up to a fixed time horizon T. Our decidability result relies on reducing the verification problem to the truth of an MSO formula over reals with a bounded time interval.