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Exposure Notifications Server is an open source reference implementation developed by Google to support the COVID-19 Exposure Notifications API, designed for use by public health authorities around the world. The server provides a secure and privacy-preserving backend system that enables governments and organizations to deploy exposure notification applications for Android and iOS devices. It handles essential backend functions, including receiving and validating temporary exposure keys from users who have tested positive, storing those keys, and generating downloadable key files for mobile devices to check for potential exposure matches. The system integrates cryptographic signing for authenticity, supports configurable data retention policies, and ensures user privacy by design—no personally identifiable information is stored or transmitted. ...

This project is an example application built with React Native that demonstrates how to implement client login authentication in a mobile context. It shows how to integrate WebViews or native modules to handle login flows, fetch tokens, and manage persistent user sessions across platforms (iOS and Android). Because mobile authentication flows often involve more complexity than web—such as secure storage, token renewal, and redirect handling—the example gives a scaffold for real-world usage. While not a full production app, it provides sufficient structure for mobile developers to learn the foundation of login/registration, token handling, and basic navigation after login. ...