[mukyu]

The talk about needing to constantly add more entropy or 'manage' it is nonsense. djb says it best: http://blog.cr.yp.to/20140205-entropy.html

Briefly, once you have say 256 random bits it is trivial to use AES and CTR mode and turn that into 2^71 random bits until you need to rekey. If you cannot get more entropy in the time it takes to use up all of those numbers something is completely broken. The only problem you can have is not having enough entropy to bootstrap (such as VMs or needing to generate a key at poweron on an embedded device), but this paper gives little more than lipservice to it.