Here's a great example of radioactive decay in use as a source of entropy[0]. Essentially, each component of a nuclear weapon derives its own private key at tim

Here's a great example of radioactive decay in use as a source of entropy[0]. Essentially, each component of a nuclear weapon derives its own private key at time of assembly from the radiation of the weapon itself, and saves the public keys of all the other components; thereafter, it'll only respond to signed communication from those other components. Basically, it removes the possible attack vector of replacing any command-and-control circuitry with your own, suborned, components. [0] - https://www.llnl.gov/news/lawrence-livermore-scientist-develops-uncrackable-code-nuclear-weapons https://www.llnl.gov/news/lawrence-livermore-scientist-devel...