Computer networks Security measures Computer security 32 Access control 12 Computers 9 Data protection 9 Passwords 6 Computer network protocols 4 Data encryption (Computer science) 4 Intrusion detection systems (Computer security) 4 Electronic commerce 3 Firewalls (Computer security) 3 Mobile computing 3 Asynchronous transfer mode 2 Business enterprises 2 Cloud computing 2 Computer crimes 2 Computer viruses 2 Cryptography 2 Database security 2 Electronic mail messages 2 Instant messaging 2 Internet of things 2 Machine learning 2 Mobile communication systems 2 Multimedia systems 2 Prevention 2 TCP/IP (Computer network protocol) 2 Vehicular ad hoc networks (Computer networks) 2 Web services 2