«We show how a fabrication-time attacker can leverage analog circuits to create a hardware attack that is small (i.e., requires as little as one gate) and stealthy (i.e., requires an unlikely trigger sequence before effecting a chip’s functionality). In the open spaces of an already placed and routed design, we construct a circuit that uses capacitors to siphon charge from nearby wires as they transition between digital values. ... We weaponize this attack ... by attaching the capacitor to a wire controllable and by selecting a victim flip-flop that holds the privilege bit for our processor.» (http://static1.1.sqspcdn.com/static/f/543048/26931843/1464016... PDF warning) #hardware #security #analog #tinfoil
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