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We demonstrate the extraction of an AES secret key from flash memory on theATMega328 microcontroller (the microcontroller used on the popular ArduinoGenuino/Uno board). We loaded a standard AVR-architecture AES-128implementation onto the chip and encrypted randomly chosen plaintexts withseveral different keys. We measured the chip's power consumption duringencryption, correlated observed power consumption with the expected powerconsumption of the plaintexts with every possible key, and ultimately extractedthe 128-bit key used during AES. We describe here our test infrastructure forautomated power trace collection, an overview of our correlation attack,sanitization of the traces and stumbling blocks encountered during datacollection and analysis, and results of our attack.

Power-Based Side-Channel Attack for AES Key Extraction on the ATMega328 Microcontroller