Security measures Computer networks 1,917 Computer security 1,145 Internet 232 Wireless communication systems 203 Data protection 193 Access control 166 Information technology 148 Data encryption (Computer science) 146 Examinations 135 Management 120 Wireless LANs 116 Prevention 115 Business enterprises 114 Computer crimes 113 Certification 112 Computers 86 Electronic commerce 86 Mobile communication systems 85 Web sites 84 Cryptography 83 Firewalls (Computer security) 82 Security systems 80 Mobile computing 79 Telecommunication 76 Electronic data processing personnel 75 Computer hackers 71 Electronic security systems 66 Dwellings 59 Global system for mobile communications 58