Hi Stephan, You've posted it again, and yet I still believe this is not the correct design or direction. I do not think the explicit goal of extended configurability ("flexibility") or the explicit goal of being FIPS compatible represent good directions, and I think this introduces new problems rather than solving any existing ones. While there are ways the current RNG could or even should be improved -- or rewritten -- this approach is still not that, no matter how many times you post it. It is almost as though you hope this somehow gets accepted through a general apathy that might develop by the 1000th revision, when cranks like me and others no longer have the motivation to keep responding with the same thing. But here we are again. My own experience pushing something that didn't have substantial enough buy-in from existing maintainers (the Zinc crypto library) ultimately led me to stop pushing in order to not alienate folks, step back, and listen a bit. Eventually somebody reached out to work with me (Ard) and we submitted a good compromise collaboration that we all generally felt better about. In this case, your cryptographic design tastes are sufficiently divergent from mine that I'm not sure how far such a thing would go, but it also seems to me that continually pushing the same thing over and over isn't winning you any points here either. Submission by attrition is not an outcome anybody should want. Sorry to be so blunt. It's just that my, "I don't like this" is the same as it was the last time, and I'm not aware of anything significant in that area changing this time. Jason