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Today's cyber-physical systems face various impediments to achieving theirintended goals, namely, communication uncertainties and faults, relative to theincreased integration of networked and wireless devices, hinder the synchronismneeded to meet real-time deadlines. Moreover, being critical, these systems arealso exposed to significant security threats. This threat combination increasesthe risk of physical damage. This paper addresses these problems by studyinghow to build the first real-time Byzantine reliable broadcast protocol (RTBRB)tolerating network uncertainties, faults, and attacks. Previous literaturedescribes either real-time reliable broadcast protocols, or asynchronous (nonreal-time) Byzantine~ones.  We first prove that it is impossible to implement RTBRB using traditionaldistributed computing paradigms, e.g., where the error/failure detectionmechanisms of processes are decoupled from the broadcast algorithm itself, evenwith the help of the most powerful failure detectors. We circumvent thisimpossibility by proposing RT-ByzCast, an algorithm based on aggregatingdigital signatures in a sliding time-window and on empowering processes withself-crashing capabilities to mask and bound losses. We show that RT-ByzCast(i) operates in real-time by proving that messages broadcast by correctprocesses are delivered within a known bounded delay, and (ii) is reliable bydemonstrating that correct processes using our algorithm crash themselves witha negligible probability, even with message loss rates as high as 60%.

RT-ByzCast: Byzantine-Resilient Real-Time Reliable Broadcast