Security measures Computer networks 57 Computer security 37 Access control 17 Data protection 15 Data encryption (Computer science) 10 Computers 9 Mobile computing 9 Electronic commerce 7 Mobile communication systems 7 Cell phones 6 Cloud computing 6 Medical records 6 Passwords 6 Public key infrastructure (Computer security) 6 Wireless communication systems 6 Data processing 4 Design and construction 4 Electronic mail messages 4 Information storage and retrieval systems 4 Information technology 4 Instant messaging 4 Internet of things 4 Intrusion detection systems (Computer security) 4 Medical informatics 4 Safety measures 4 Banks and banking 3 Biometric identification 3 Computer network protocols 3 Cryptography 3