I've an application storing data in a local database. In order to synchronise data between different devices, I want to implement Firebase Firestore.
Though Firebase Firestore's access rules, the admin of the project can still access all data stored in firestore, that's why I want to encrypt the data before uploading... The keys for decryption also have to be exchanged with all devices.
How can I realise that? Are there some existing concepts/samples?