DNSSEC Mastery. The author of the book is Michael W. Lucas, again (from my not too long ago book review blog post, Absolute OpenBSD 2nd Edition). He's now one of my favorite tech book author, upgraded from "favorite blog author". The "upgrade" was done after reading another of his new book published by No Starch Press, Absolute OpenBSD 2nd Edition. This review is the result of my reading of DNSSEC Mastery. It may not be the whole truth, but at least this is what I've understand from it.
Here it goes: