Classificação da Biblioteca do Congresso dos E.U.A. (LCC)Z102.5-104.5

Alan Turing(12) art(5) biography(9) Bletchley Park(6) children(27) children's(45) Christian fiction(5) Christianity(8) ciphers(198) codes(441) Codes and Ciphers(49) communication(27) computer(25) computer science(59) computer security(11) computers(68) computing(49) crypto(97) cryptography(1,631) culled(5) cultural history(6) cypher(5) digital(5) education(8) educational(5) encryption(72) engineering(7) Enigma(37) esoteric(5) espionage(148) games(22) Germany(5) guide(5) hacking(6) historical(18) history(858) history of science(41) how-to(13) humor(6) information technology(9) information theory(5) informational(8) infosec(5) intelligence(58) internet(5) juvenile(11) juvenile non-fiction(6) kids(6) language(100) languages(11) literature(5) logic(8) magic(7) math(649) military(23) military history(26) military intelligence(10) mystery(19) number theory(6) orthography(5) paper(5) politics(7) popular mathematics(7) popular science(85) privacy(7) programming(11) puzzle(12) puzzles(43) reference(84) religion(14) romance(7) science(459) science and technology(9) science fiction(6) secrecy(12) secrets(17) security(87) spy(99) tech(5) usa(11) war(25) writing(22) ya(6) youth(5)