Related by context. Frequent words. (Click for all words.) 55 cryptographers 52 cryptographer 50 Bletchley Park 49 cryptology 48 Alan Turing 48 Enigma 48 decrypting 46 Turing 45 cryptography 43 decoded 43 encryption algorithm 43 cryptographic 43 decrypt 43 decrypted 42 decryption 41 decrypts 40 decode 40 cypher 39 ciphers 38 deciphered 38 Xerox PARC 38 hacker 38 vacuum tubes 38 encrypted 37 coded 37 encryption 37 artifact 37 encryption algorithms 36 coded messages 36 spies 36 Nuremberg Trials 36 encryption decryption 36 cipher 36 typewriter 36 steganography 36 computer 36 hackers 36 manual typewriters 36 cryptographic keys 35 Engelbart 35 Cryptographic 35 Cryptography 35 floppy disk 35 Operation Overlord 35 Nazi sympathizers 35 vacuum tube 35 SPECTRE 35 artefacts 35 hexadecimal 35 artefact 35 encryption keys 35 Encrypted 35 mathematician 34 authenticator 34 purloined 34 blueprints 34 codex 34 algorithm 34 binary code 34 ZIP file 34 Stasi secret 34 Mata Hari 34 monoplane 34 phrasebook 33 decoding 33 Aldrich Ames 33 MI6 33 deciphering 33 quantum cryptography 33 bookbinder 33 encoded 33 forgers 33 code 33 anagrams 33 encrypt 33 MS DOS 33 spy 33 prototype 33 ejector seat 33 trove 33 CAPTCHAs 33 typewriters 32 espionage 32 secretly 32 inventions 32 Bodleian Library 32 secret 32 hieroglyphs 32 Typewriter 32 passphrase 32 Zippo lighter 32 Aston Martin DB5 32 codenames 32 eavesdropper 32 quantum computers 32 computers 32 Portable Document Format 32 ASCII 32 hypertext 32 Gestapo 32 camera obscura