Security measures Telecommunication Access control 7 Computer networks 6 Computers 4 Telecommunication systems 4 Data encryption (Computer science) 3 Internet 3 Management 3 Computer crimes 2 Computer security 2 Equipment and supplies 2 Mobile computing 2 Virtual computer systems 2 Wiretapping 2 Biometric identification 1 Cell phone systems 1 Cloud computing 1 Communication planning 1 Computer science 1 Cryptography 1 Customer relations 1 Data protection 1 Digital computer simulation 1 Digital subscriber lines 1 Electronic commerce 1 Electronic surveillance 1 Energy conservation 1 Evaluation 1 Fault tolerance (Engineering) 1