A new Flutter project to create a group based chat app with end to end encryption. This is a RSA encryption based chat app. With this app you can communicate with anyone safely..Your private key can be removed from this app anytime if you feel threatened to make all your chats un readable.. Because of RSA generated key the massages in a group is encrypted and nobody can access that info from outside or in the database.

In this chat app we have gone with an approach that is based on groups. To start communicating with anyone in this chat app. Users have to first sign up in this app with their mobile number and then they can start the process. They have to create a group first then add members to it. They have to use their phone number to add friends. This group method is used for all one to one chat or one to many chats… We have used firebase as our database and authentication.

There can be 7 users max in a group. Cause the encrypted message limitations. If a user send message in 7 users group then the message will be 27 times in the database.

For encryption key download this library

• [FastRsa library] (https://pub.dev/packages/fast_rsa) → Used

flutter:

• sdk: flutter

The following adds the Cupertino Icons font to your application. Use with the CupertinoIcons class for iOS style icons.

• cupertino_icons: ^1.0.2
• cupertino_list_tile: ^0.2.1
• For firestore…………..
• cloud_firestore: ^3.4.6
• firebase_auth: ^3.7.0
• firebase_storage: ^10.3.7
• firebase_core: ^1.21.1
• cloud_functions: ^3.3.6

For the pop up

• fluttertoast: ^8.0.9

For encryption

• asn1lib: ^1.1.0
• fast_rsa: ^3.4.7

For saving private key in shared preferences

• flutter_secure_storage: ^6.0.0

For flag

• intl_phone_field: ^3.1.0

Timestamp

• intl: ^0.17.0

for settings_ui

• flutter_settings_screens: ^0.3.0-null-safety

• User can create group to share messages
• User can add multiple people into the group
• Users active status
• All user messages are Encrypted by RSA algorithm
• User can delete the Private key to secure his messages
• User can copy & move his private key from the app
• We have no-sql based database to keep information

This project is a starting point for a Flutter application.

A few resources to get you started if this is your first Flutter project:

• Lab: Write your first Flutter app
• Cookbook: Useful Flutter samples

For help getting started with Flutter development, view the online documentation, which offers tutorials, samples, guidance on mobile development, and a full API reference.