DPA (Differential Power Analysis) is a form of attack on a smart cards that represents an improvement on simple power analysis (SPA). It involves first making repeated measurements of the current consumption of a microcontroller for certain operations using known data with high time resolution and eliminating random noise by averaging. Following this, the current consumption is measured using unknown data, and deductions regarding the unknown data are made by analyzing the differences between the results with known and unknown data.

 

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