Security Network security 7 security 6 Cybersecurity 4 Privacy 4 Internet of things 3 Trust 3 5G mobile communication systems 2 Attack 2 Authentication 2 Cloud computing 2 Cloud-computing 2 Crime 2 Cryptography 2 Cyber security 2 Denial-of-service attack 2 Electric power transmission networks 2 Energy 2 Graph theory 2 Graphic methods 2 Internet of Things 2 Intrusion detection 2 Protection 2 Public key cryptography 2 STP 2 Security analysis 2 Servers 2 Threats 2 authentication 2 'current 1