4 ms·
Manufacturers MUST stick a giant decoupling capacitor feeding LEDs to debounce any possible side-channel down to undetectable ripple. If you want an activity in
by cvccvroomvroom 3y ago
Manufacturers MUST stick a giant decoupling capacitor feeding LEDs to debounce any possible side-channel down to undetectable ripple. If you want an activity indicator, make it a separate simple, air-gapped circuit rather than something directly adjacent to cryptographic operations.
It's also imperative to minimize all sort of other EMF from a Van Eck perspective.
- eternityforest 3y agoOr they could put the LED under software control (Why do you have LEDs the MCU can't control anyway?) and turn it off during operations, or blink at 1/20 duty cycle to increase the time. But in practice it doesn't matter that much for most of us.