Activity monitoring 2 Differential privacies 2 Driver activity monitoring 2 Federated learning 2 Ho-momorphic encryptions 2 Homomorphic-encryptions 2 Learning frameworks 2 Open-source 2 Open-source federated learning framework 2 Privacy 2 Privacy-preserving techniques 2 Secure multi-party computation 2 Smartphones 2 differential privacy 2 driver activity monitoring 2 federated learning 2 homomorphic encryption 2 open-source federated learning frameworks privacy 2 secure multi-party computations 2