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 devices. This is done by obtaining video footage from a device's power LED (by filling the frame with the LED) and exploiting the video camera's rolling shutter to increase the sampling rate by three orders of magnitude from the FPS rate (60-120 measurements per second) to the rolling shutter speed (60K measurements per second in iPhone 13 Pro Max). The frames of the video footage of the device's power LED are analyzed in the RGB space, and the associated RGB values are used to recover the secret key by inducing the power consumption of the device from the RGB values...
By: Etay Iluz , Ben Nassi
Full Abstract and Presentation Materials:
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