OAuth Security. Lucent Sky CLEAR. Security Engineering - A Guide to Building Dependable Distributed Systems. ‘I'm incredibly impressed that one person could produce such a thorough coverage. Moreover, you make the stuff easy and enjoyable to read. I find it just as entertaining — and far more useful — than novels (and my normal science fiction). When I first got it in the mail, I said to myself "I'm never going to read all of that. " But once I started reading I just kept going and going. Nmap - Free Security Scanner For Network Exploration & Security Audits.