I had the need to look up NSA’s Rainbow Series today.  For those who don’t know, this is a series of books used to help evaluate “Trusted Computer Systems.” The name was derived from the fact each book had a different color cover.  The book most often referenced is the Orange Book, which focuses on Configuration Management. If you would like to virtually touch history, swing over to http://www.fas.org/irp/nsa/rainbow.htm and read some of the books. And if by some chance you have a stack of these laying around you want to get rid of, I’d love to take them off your hands.