In many embedded systems and constrained devices, there is a lack of proper randomness. And often the system environment is too stable to use as source of entro

In many embedded systems and constrained devices, there is a lack of proper randomness. And often the system environment is too stable to use as source of entropy (by connecting a sensor). This makes it hard to set up secure sessions. If fairness, more and more MCUs (esp based on ARM Cortex) that contain some sort of TRNG / entropy source. Some of them have fairly good quality too. But there are still tons of 8051-based MCUs that lack any source of randomness. Having a cheap, physically compact, low power source of entropy that can be attached is in these cases quite useful. Esp for securing systems already in use.