Security measures Wireless communication systems 6 Equipment and supplies 2 Wireless LANs 2 Biometric identification 1 Bluetooth technology 1 Cell phones 1 Cellular telephone systems 1 Computer networks 1 Computer security 1 Data encryption (Computer science) 1 Design and construction 1 Human-computer interaction 1 Instant messaging 1 Mobile communication systems 1 Mobile computing 1 Multicasting (Computer networks) 1 Public key infrastructure (Computer security) 1 Safety measures 1 Vehicular ad hoc networks (Computer networks) 1 Wireless sensor networks 1