> > Note for others: "The extract step in HKDF can concentrate existing > entropy > but cannot amplify entropy." is not came from the RFC. If a RFC states > this I would be stunned. Please read on you'll see the evidence. >
This is ridiculous. Be stunned. It's right in the section about applications of HKDF: https://tools.ietf.org/html/rfc5869#section-4, in the middle of the second paragraph. Please stop, it's enough. Regards, Niklas
