Security measures Computer networks 17 Computer security 9 Wireless communication systems 8 Access control 7 Intrusion detection systems (Computer security) 7 Mobile communication systems 7 Mobile computing 7 Information storage and retrieval systems 5 Public key infrastructure (Computer security) 5 Cryptography 4 Multimedia systems 4 Cell phones 3 Data protection 3 Cell phone systems 2 Computers 2 Data encryption (Computer science) 2 Database security 2 Digital techniques 2 Digital watermarking 2 Dissertations 2 Dissertations, Academic 2 Electronic mail systems 2 Equipment and supplies 2 Machine learning 2 Malware (Computer software) 2 Mathematical models 2 Medical informatics 2 Medical records 2 Multicasting (Computer networks) 2