Chapter 2. Lecture II
As I said at the close of the preceding lecture, a bit of history is always useful in introducing a subject belonging to a special and not too well-known field; therefore, I'll proceed with some historical information about cryptology, which, as you learned before, comprises two closely related sciences, namely, cryptography and cryptanalysis. I will repeat and emphasize that they are but opposite faces of the same valuable coin; progress in one inevitably leads to progress in the other, and to be efficient in cryptology you must know something about each of them.
Cryptography and cryptanalysis probably go back to the dawn of the invention and development of the art of writing itself. In fact, there is reason for speculating ...
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