Klassifikation der Library of Congress [LCC] (USA)Z40.G4718

16th century(31) Alan Turing(12) alphabets(140) application(6) art(899) art history(41) arts(29) bibliography(84) book history(49) books about books(78) business(42) children(41) children's(55) ciphers(199) codes(448) Codes and Ciphers(49) communication(59) computer(251) computer science(75) computer security(11) computer software(7) computers(253) computing(88) crypto(97) cryptography(1,631) cultural history(27) culture(32) cypher(5) design(163) dictionary(60) drawing(21) education(82) educational(22) encryption(72) Enigma(37) espionage(148) facsimiles(10) games(31) genealogy(40) graphic design(50) guide(52) heraldry(15) historical(50) Historical Studies(11) history(1,415) history of science(42) how-to(225) hypertext(15) ibm(7) illuminated(8) illuminated manuscripts(40) information technology(19) ink(10) instruction(91) instructional(50) instructions(9) intelligence(58) language(338) language arts(45) languages(29) letters(40) manuscripts(79) math(650) medieval(120) Microsoft(50) Middle Ages(32) military intelligence(10) orthography(19) paper(31) popular science(86) programming(22) projects(29) puzzle(13) puzzles(45) reference(613) sca(38) science(469) scribe(59) script(86) secrecy(12) security(87) software(151) spy(99) technique(83) text(14) textual(5) typewriter(88) typography(207) usa(35) Word(118) word processing(98) words(28) writing(660) writing history(8) writing systems(106) written communication(8)