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Deciding branching hyperproperties for real time systems.

Event Type
Seminar/Symposium
Sponsor
PL/FM/SE area-wide
Location
0222 Siebel Center and Zoom
Virtual
wifi event
Date
Sep 20, 2024   2:00 - 3:00 pm  
Speaker
Nabarun Deka
Contact
Kristin Irle
E-Mail
kirle@illinois.edu
Phone
217-244-0229
Views
1

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. 

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