Security measures Computer networks 63 Computer security 41 Access control 19 Data protection 18 Computers 11 Data encryption (Computer science) 10 Mobile computing 9 Electronic commerce 8 Mobile communication systems 7 Wireless communication systems 7 Cell phones 6 Cloud computing 6 Medical records 6 Passwords 6 Public key infrastructure (Computer security) 6 Computer network protocols 5 Data processing 5 Intrusion detection systems (Computer security) 5 Safety measures 5 Cryptography 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 Management 4 Medical informatics 4 Multimedia systems 4