[mafuyu]

I read a whitepaper recently that a MEMS accelerometer can provide sufficient entropy to derive random numbers from. Either way, I would treat external sensors as only a raw entropy source, and use them to drive a CSPRNG reseeded from an entropy pool. I don't think it's cryptographically secure to use the values directly. (Maybe an expert could chime in here?)

I've been looking at ways to get cryptographically secure random bytes on low power micros, and that's the approach I'm taking. The standard for CSPRNGs is AES-GCM, which is a bit heavy, though. Anyone know if Fortuna still acceptable to use?