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The thing with these book's it that they are out of date...the technology mentioned is Old, but the consept is well worth it, I have stored many of the Rainbow book's for a rainy day ;) If you want to, read them, if not, don't....it is true that they are rather intense....but with some luck and coffee, you should get through it....
- Noia
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They are not updated at all. They are old unclassified DOD/NSA standards. They can tend to be really boring to read, but they do have interesting points. Yes, the material is rather dated, but if you can read them, they give you a good grasp of security issues. Actually boring is quite the word for it. It is really "dry" More about how things should be in a general sence then how things are implemented.
As a security newbie, read everything you can get your hands on. If you can find a book on programming ENIAC, read it. It may be outdated, and completely impractical, but there are always ideas that may come in to practice down the road.