3 ms·
Why not just sample a noise diode, or thermal noise from a highly amplified resistor? Is the process of amplification (i.e. periodic power supply noise) enough
by madengr 9y ago
Why not just sample a noise diode, or thermal noise from a highly amplified resistor? Is the process of amplification (i.e. periodic power supply noise) enough to influence the randomness?
- sigstoat 9y agowhy do you think that's simpler than what they're doing? you'd still have to feed that through something to get it into a PC. the STM32 is about the cheapest way of doing that. and it turns out it comes with some ADCs that are so noisy they're good sources of randomness themselves.
- IWeldMelons 9y agoThe cheapest way is to use good old soundcard, an opamp and passives. You could fit in $1 easily.
- IWeldMelons 9y agomost of HN readers are not familiar with EE, unfortunately.
- lazylester 9y agoYes this is exactly what you need to do. And yes it takes some careful design to eliminate power supply noise. NeuG has some low quality sources of entropy, and also provides analog input for the user to supply with whatever they wish. It does not address the design of a good white noise generator, unfortunately.