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E-books have been with us for quite some time now and although there might be quite a few book enthusiasts out there that could dislike e-books because they lack the “magic” which obscurely surrounds a regular book, I believe that any book lover should embrace both the e-book and the old fashioned printed paper, as they are both simply mediums through which we can get our portion of literature.

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The free e-book consist in a series of lectures given by David G. Boak in 1966. This lecture, while fascinating in many aspects, presents NSA’s approach to different communication security issues, cryptography and even economics.

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