“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
“His method resembles George Bernard Shaw’s way of using the /f/ sound of GH in “tough,” the /i/ sound of o in… — David Kahn Bernard shaw 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
“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 Thousands Letters Copy Share Image
“For written messages, the Chinese would often write on exceedingly thin silk or paper, which they rolled into a ball and covered… — David Kahn Silk Paper 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 Analysis 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
“Another steganographic system was still in use in the 20th century: Aeneas suggested pricking holes in a book or other document above… — David Kahn Invisible ink Copy Share Image
