Rebound is the return movement that follows an impact or compression. In security engineering, it matters because many trusted devices still depend on physical parts: buttons, switches, hinges, latches, and sensors. When those parts rebound, they can create extra motion or repeated signals that software must interpret correctly.
Cyber attackers can abuse rebound indirectly by forcing a sensor or switch to oscillate, which may cause multiple reads, missed events, or unreliable tamper detection. This is why secure systems often add damping, debounce filters, and timing checks to stabilize inputs. Good defenses treat rebound as a signal-quality problem: they measure the mechanical return, filter noise, and make sure one physical action produces only one intended response.