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Device security is unique because the adversary often has physical access. A mobile attacker can jailbreak the device; an IoT attacker can desolder flash chips and read firmware; a hardware attacker can probe voltage rails or fault-inject. The threat model has to account for 'attacker holds the device' as a normal case.
Mobile threat surface: user installs malicious app, attacker steals device, malware sideloaded via USB. IoT: firmware extracted from flash, RF traffic intercepted, supply-chain compromise at factory. Hardware: glitching, side-channel power analysis, decapping the chip.