Computer security Security measures 41 Computer networks 32 Data protection 18 Access control 11 Data encryption (Computer science) 11 Computers 8 Passwords 5 Cryptography 4 Firewalls (Computer security) 4 Cloud computing 3 Computer algorithms 3 Intrusion detection systems (Computer security) 3 Mobile computing 3 Online social networks 3 Technological innovations 3 Computer network protocols 2 Data processing 2 Electronic mail messages 2 Instant messaging 2 Internet 2 Local area networks (Computer networks) 2 Machine learning 2 Malware (Computer software) 2 Mobile communication systems 2 Androids 1 Anomaly detection (Computer security) 1 Application program interfaces (Computer software) 1 Bluetooth technology 1 Challenges 1