The rngd daemon (RNG daemon) is used to feed the kernel's entropy pool, which is used by the operating system to generate random numbers. Glossmen Nm 115 Page
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A Random Number Generator (RNG) is often used in computing for various purposes, including simulations, modeling, and cryptography. When it comes to Linux or Unix-like systems, rng-tools is a package that provides a daemon to collect, distribute, and report on entropy (used for generating random numbers).