Programming Quote by David Kahn
““The technique was at least moderately well known, for Ibn Khaldūn wrote in The Muqaddimah: “Occasionally, skillful secretaries, though not the first to invent a code [and with no previous knowledge of it], nonetheless find rules [for solving it] through combinations which they evolve for the purpose with the help of their intelligence, and which they call ‘solving the puzzle [cryptanalysis].””