Computer networks Security measures Computer security 30 Access control 12 Computers 9 Data protection 7 Passwords 6 Data encryption (Computer science) 4 Firewalls (Computer security) 4 Intrusion detection systems (Computer security) 3 Mobile computing 3 Asynchronous transfer mode 2 Business enterprises 2 Cloud computing 2 Computer crimes 2 Computer network protocols 2 Computer viruses 2 Electronic commerce 2 Electronic mail messages 2 Instant messaging 2 Internet of things 2 Machine learning 2 Mobile communication systems 2 Prevention 2 TCP/IP (Computer network protocol) 2 Vehicular ad hoc networks (Computer networks) 2 Web services 2 Anomaly detection (Computer security) 1 Application program interfaces (Computer software) 1 Biometric identification 1