Overall security mainly depends on client side: good passphrase and cryprographically good pseudo random number generator.
Some operating systems do not have good enough quality PRNG, bad /dev/urandom. You should use separate PRNG with them. GoVPN communicates with them using Entropy Gathering Daemon protocol.
To switch using EGD-compatible daemons instead of
library you provide -egd PATH command line option, where
PATH is the domain socket.
$ ./govpn-server [...] -egd /var/run/egd.sock