Security measures 3,183 Computer security 2,508 Computer networks 1,956 Security systems 493 Data protection 414 Electronic security systems 368 Access control 259 Cryptography 254 Wireless communication systems 253 Data encryption (Computer science) 248 Computer crimes 246 Internet 242 National security 214 Management 211 Examinations 186 Prevention 184 Computers 169 Computer hackers 166 Information technology 165 Certification 160 Global system for mobile communications 138 Firewalls (Computer security) 136 Electronic data processing personnel 120 Securities 120 Business enterprises 119 Wireless LANs 116 Security, International 115 Derivative securities 113 Mobile communication systems 106 Design and construction 104