“…Some channels are studied from a similar perspective in both platforms (e.g., cache side channels in Android [38], [82] and in iOS [22], [28]), while some are from a slightly different perspective. For example, magnetic side channels in iOS have been explored to monitor app activities [45] assuming pre-installed malicious apps and channels in Android are leveraged to finger movement trajectories [30], [41], [60] requiring additional equipment (e.g., stylus). In addition, some side channels have only been studied in Android, such as using channels based on procfs to eavesdrop keystrokes, fingerprint webpages, and hijack UIs [18], [24], [31], [37], [54], [81].…”