Cryptography Computer security 35 Data encryption (Computer science) 15 History 14 World War, 1939-1945 12 Computer networks 10 Security measures 9 Electronic intelligence 7 Military intelligence 7 United States 7 Ciphers 5 Data processing 5 Internet 5 Coding theory 4 Data protection 4 Java (Computer program language) 4 Telecommunication 4 Campaigns 3 Communications and Security 3 Computer and Information Science 3 Computer systems 3 Criptografía 3 Cryptographie 3 Engineering and Technology 3 Mathematics 3 Physical Sciences 3 Application software 2 C++ (Computer program language) 2 Cold War 2 Communication systems 2