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Quote by David Kahn

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““The more a cipher deviates from the simple form in which one ciphertext letter invariably replaces the same plaintext letter, the harder it is to break.””

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“Another steganographic system was still in use in the 20th century: Aeneas suggested pricking holes in a book or other document above or below…

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“Also of great importance in the discovery of linguistic phenomena that led to cryptanalysis was the development of lexicography.”

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