Hackers have demonstrated how to steal a cryptographic secret key from an Android smartphone using an iPhone.
The researchers, Ben Nassi, Etay Iluz, Or Cohen, Ofek Vayner, Dudi Nassi, Boris Zadov, and Yuval Elovici, were able to demonstrate how secret keys could be harvested from non-compromised devices using video recorded by consumer-grade video cameras such as found in an iPhone 13 Pro Max. Video, that is, of device power LEDs.
In the case of the Samsung Galaxy S8 target device, which holds a 378-bit Supersingular Isogeny Key Encapsulation secret key, a side-channel exploit was used. This involved analysing video of Logitech Z120 USB speakers attached to the S8, or rather the power LED of those speakers which were connected to the same USB hub as was being used to charge the smartphone.You’ve probably already started wondering just how worried you need to be by this type of research.
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