Security measures Prevention 584 Computer networks 556 Computer security 474 Terrorism 302 Security systems 298 National security 213 Aeronautics, Commercial 195 Law and legislation 183 Government policy 168 Airports 162 Internet 129 Harbors 128 Data protection 126 Cyberterrorism 123 Management 120 Access control 113 Evaluation 111 Safety measures 103 Computer crimes 100 Information technology 92 Computers 87 Airline passenger security screening 85 Nuclear facilities 77 Privacy, Right of 77 Electronic data processing departments 74 Data processing 69 Shipping 66 Administrative agencies 63 Ports of entry 62