How to Measure the Power Consumption of a Data Bus in a Chip

The key is inside the chip, and this is the part that seems crazy. The number of ones going across the data bus or the hamming weight is related to the power consumption on like, every clock cycle. And so you can recover the secret key in this eative us by saying, you know, if i sent in x a e, and i see ou now zero ones go across theDataBus. Well, the only way that could happen is if that secret key itself was also a e. So there's sort of basicall operations like that that the attack is doing.