Video-Based Cryptanalysis: Recovering Cryptographic Keys from Device Using Video of Power LED

In this talk, we present video-based cryptanalysis, a new method to recover secret keys from a non-compromised device by analyzing video footage obtained from a device's power LED. We show that cryptographic computations performed by the device's CPU change the power consumption, affecting the brightness/color of the device's power LED. Based on this observation, we show how attackers can exploit commercial video cameras (e.g., of an iPhone 13 Pro Max or an Internet-connected security camera) to recover secret keys from …

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