“The Arabic knowledge of cryptography was fully set forth in the section on cryptology in the Subh al-a ‘sha, an enormous, 14-volume… — David Kahn Copy Share Image
“soon as a culture has reached a certain level, probably measured largely by its literacy, cryptography appears spontaneously—as” — David Kahn Cryptography Copy Share Image
“This list encompassed, for the first time in cryptography, both transposition and substitution systems, and, moreover, gave, in system 5, the first… — David Kahn Copy Share Image
“the conviction in the minds of many people that cryptology is a black art, a form of occultism whose practitioner must, in… — David Kahn Art Copy Share Image
“The technique was at least moderately well known, for Ibn Khaldūn wrote in The Muqaddimah: “Occasionally, skillful secretaries, though not the first… — David Kahn Programming Copy Share Image
“Much of the history of cryptology of this time is a patchwork, a crazy quilt of unrelated items, sprouting, flourishing, withering. Only… — David Kahn History Copy Share Image
“The only writer of the Middle Ages to describe cryptography instead of just using it was Roger Bacon, the English monk of… — David Kahn Art Copy Share Image
“The multiple human needs and desires that demand privacy among two or more people in the midst of social life must inevitably… — David Kahn Cybersecurity Copy Share Image
![“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…” quote by David Kahn](https://sms4smile.com/q/img-quotes/1d1/david-kahn-13896_programming_the-technique-was-at-least-moderately-we_657231.jpg)
