Computer security Security measures Computer networks 42 Access control 9 Computers 7 Data protection 5 Internet 4 Passwords 4 Computer network protocols 3 Firewalls (Computer security) 3 Intrusion detection systems (Computer security) 3 Computer crimes 2 Data encryption (Computer science) 2 Dissertations 2 Dissertations, Academic 2 Electronic mail messages 2 Information technology 2 Instant messaging 2 Local area networks (Computer networks) 2 Anomaly detection (Computer security) 1 Application program interfaces (Computer software) 1 Application software 1 Automatic control 1 Automation 1 Ciphers 1 Cloud computing 1 Coding theory 1 Computational grids (Computer systems) 1 Computer algorithms 1 Computer hackers 1