USB is the most common interface for computer peripherals (maybe you've heard of it?), and now includes many USB-connected security devices, such as Bitcoin wallets, FIDO2 keys, and encrypted drives. The three biggest threats to these security devices are USB protocol errors (often discovered through fuzz testing), side-channel power analysis, and fault injection. PhyWhisperer-USB targets the last two - it serves as a cycle-accurate triggering and monitoring tool. It monitors the USB bus for specific data patterns, triggers events such as fault injection or records power traces, and can also log USB data.
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