Linux keeps track of "credit" for entrophy pool sources. Anyone can write to /dev/random - this mixes data into the entrophy pool but it won't be "credited" as

Linux keeps track of "credit" for entrophy pool sources. Anyone can write to /dev/random - this mixes data into the entrophy pool but it won't be "credited" as securely increasing /proc/sys/kernel/random/entropy_avail . https://www.whonix.org/wiki/Dev/Entropy https://www.whonix.org/wiki/Dev/Entropy Similarly, systemd-boot can seed from disk but will not "credit" entrophy. https://systemd.io/RANDOM_SEEDS/ https://systemd.io/RANDOM_SEEDS/ If the point of /dev/random is to provide crytographically secure random numbers, then some level of paranoia is needed for determining which sources are "credited" for initializing the pool. https://lwn.net/Articles/760121/ https://lwn.net/Articles/760121/