Federated learning 19 Privacy-preserving techniques 8 Learning systems 7 federated learning 7 Privacy 6 Artificial intelligence 5 Technology: general issues 5 privacy 5 Data privacy 4 Deep learning 4 Federated Learning 4 Learning algorithms 4 Computational modeling 3 Data models 3 Differential privacies 3 History of engineering & technology 3 Internet of things 3 Learning frameworks 3 Machine learning 3 Privacy preserving 3 Secure multi-party computation 3 Training 3 WAP (wireless) technology 3 article 3 homomorphic encryption 3 human 3 5G mobile communication systems 2 Activity monitoring 2 Blockchain 2 COVID-19 2