Fleet

Summary

Fleet is an RSA encrypted realtime chat application, based on Firebase Realtime Database.

Key HighLights

• SQLite Database stores all the chats locally, encrypted by the user's Public Key
• Firebase Authentication for user management, alongwith Firebase Storage for online accessibility of every user's Profile Image and Public Key
• One-time KeyPair Generation at the time of registering a new account

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Implementation details

• Firebase Authentication checks if the user is signed in, to ensure Firebase Databases aren't publically accessible
• The credentials of the user (excluding password) are saved in a "users" node on Realtime Database, while their profile Image and Public Key are stored in Firebase Storage
• Upon account registration, A Key Pair is generated and saved locally, alongside pushing the Public Key to the Firebase Storage
• All the contacts for the user, and their respective chats are stored locally via SQLite Databases
• The messages stored in the SQLite Database locally are all encrypted with the User's personal Public Key
• Every time the messages are accessed from the database, they are decrypted with the User's personal Private Key
• The Firebase Listener that listens for new messages, deletes each message it recieves after processing it, hence ensuring no messages are stored online once

Important mentions

Fleet uses a number of open source projects to work properly:

• RSA - Clean implementation of RSA Algorithm
• Glide - awesome firebase image library
• Android Image Cropper - smooth iamge cropping library
• Friends who've helped point out bugs and crashes until the current build

Known Issues

• Currently the chat screen periodically refreshes the RecyclerView for new messages, instead of working via callback, which would be more efficient Any help fixing that would be greatly appreciated

Test it yourself

For the signed v2 release apk: Fleet v1.0 apk

Screenshots

• Firebase Realtime Database Snapshot

• Chats Database Snapshot

• Users Database Snapshot

Thanks for giving me your time xD