Just saw a reference to this today: https://www.surf.nl/en/news/2017/06/roland-van-rijswijk-deij-defends-his-phd-thesis-on-improving-dns-security.html http://wwwhome.ewi.utwente.nl/~rijswijkrm/pub/thesis-ebook.pdf Looks like a worthwhile read on the deployment of DNSSEC. Cheers, Phil