Computer security 2,508 Security measures 1,341 Computer networks 994 Data protection 328 Computer crimes 204 Cryptography 195 Access control 176 Computer hackers 150 Data encryption (Computer science) 148 Firewalls (Computer security) 136 Computers 125 Internet 124 Information technology 122 Management 121 Examinations 110 Certification 97 Investigation 89 Electronic data processing personnel 80 Mobile computing 76 Prevention 75 Computer software 63 Data processing 50 Development 48 Microsoft Windows (Computer file) 47 Operating systems (Computers) 47 Forensic sciences 46 Business enterprises 43 Penetration testing (Computer security) 42 Wireless communication systems 39 Electronic data processing 37