What is it?
Recovering keys from physical leakage — power traces, EM emissions, timing — by treating it as a noisy signal. Correlation power analysis, filtering and spectral methods are signal-processing mathematics applied to security.
Formulas
- CPA: the key guess whose predicted leakage best correlates with the trace wins
This page has the essentials. A fuller treatment (intuition, formal definition, worked example) is on the way.