end2end_messaging

RSA-encrypted mobile messaging for privacy. A Flutter chat app where messages are encrypted on the device before they ever touch the network, so the server only ever sees ciphertext.

Features

• End-to-end encryption. RSA key pairs are generated on device. Messages are encrypted with the recipient's public key and can only be decrypted locally.
• Phone-number auth. Onboarding with number entry and SMS verification through Firebase Auth.
• 1:1 chats. Realtime conversations backed by Cloud Firestore.
• Profiles. Create and edit a profile, browse people, start a chat.

Project structure

lib/
├── screens/auth/     # onboarding, enter/verify number, profile setup
├── screens/          # chats list, chat screen, chat details, people
├── models/           # user, message
├── services/         # crypto + Firebase plumbing
└── helpers/          # UI utilities

Getting started

flutter pub get
# add your own Firebase project (flutterfire configure)
flutter run

Stack

Flutter · Firebase Auth · Cloud Firestore · RSA with on-device key generation