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Quote by David Kahn

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““If two direction-finders take bearings like that on a signal and a control center draws the lines of direction on a map, the point at which they cross marks the position of the transmitter.””

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“Analyzing the frequency and contacts of letters is the most universal, most basic of cryptanalytic procedures.”

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“General Joseph O. Mauborgne, who became Chief Signal Officer in October, 1937. Mauborgne had long been interested in cryptology. In 1914, as a young…

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“Cryptology served magical purposes frequently throughout the Middle Ages, and even in the Renaissance was still disguising important parts of alchemical formulas.”

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“Ibn ad-Duraihim, according to Qalqashandi, gave seven systems of cipher:”

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“The technique was at least moderately well known, for Ibn Khaldūn wrote in The Muqaddimah: “Occasionally, skillful secretaries, though not the first to invent…

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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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Explore all 48 David Kahn quotes