“they employed a device called the “skytale,” the earliest apparatus used in crypto-logy” — David Kahn Copy Share Image
“The more a cipher deviates from the simple form in which one ciphertext letter invariably replaces the same plaintext letter, the harder… — David Kahn Copy Share Image
“From the early days of its existence, cryptology had served to obscure critical portions of writings dealing with the potent subject of… — David Kahn Life Copy Share Image
“The association of magic and cryptology was reinforced by other factors. Mysterious symbols were used in such esoteric fields as astrology and… — David Kahn Copy Share Image
“Suetonius, the gossip columnist of ancient Rome, says that Caesar wrote to Cicero and other friends in a cipher in which the… — David Kahn Ancient rome Copy Share Image
“For almost a thousand years, from before 500 to 1400, the cryptology of Western civilization stagnated.” — David Kahn Thousand years Copy Share Image
“The solution had taken a terrific toll. The restless turning of the mind tormented by a puzzle, the preoccupation at meals, the… — David Kahn Hope Copy Share Image
“He was also talented in other directions: he played the violin well and was an accomplished artist, exhibiting at, among others, the… — David Kahn Art Copy Share Image
“This kind of work, particularly in the early stages of a difficult cryptanalysis, is perhaps the most excruciating, exasperating, agonizing mental process… — David Kahn Known To Man Copy Share Image
“Every weapon of cryptanalytic science—which in the stratospheric realm of this solution drew heavily upon mathematics, using group theory, congruences, Poisson distributions—was… — David Kahn Mathematics Copy Share Image
“since military operations are usually accompanied by an increase in communications, traffic analysis can infer the imminence of such operations by watching… — David Kahn Communication Copy Share Image
“the use of atbash in the Bible sensitized the monks and scribes of the Middle Ages to the idea of letter substitution.… — David Kahn Bible 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 First time Copy Share Image
“But of any science of cryptanalysis, there was nothing. Only cryptography existed. And therefore cryptology, which involves both cryptography and cryptanalysis, had… — David Kahn Science Copy Share Image
“between 321 and 300 B.C., recommended that ambassadors use cryptanalysis to obtain intelligence: “If there is no possibility of carrying on any… — David Kahn Insane person Copy Share Image
“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
“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
“Its coding wheels, stepping a space—or two, or three, or four—after every letter or so, did not return to their original positions… — David Kahn Copy Share Image
“Polybius, devised a system of signaling that has been adopted very widely as a cryptographic method. He arranged the letters in a… — David Kahn Right hand Copy Share Image
“If two direction-finders take bearings like that on a signal and a control center draws the lines of direction on a map,… — David Kahn Copy Share Image
“He served as a cryptanalyst with the American Expeditionary Forces in World War I, and returned to River-bank to write an 87-page… — David Kahn First time Copy Share Image
