Android Messenger App Development

Key Features.
Individual Chat Features
● User Authentication
○ Sign up and sign in functionality.
○ Only for anonymous account creation.
○ User profile management.
● One
○ Description: Users can send and receive text messages in
real-time.
○ Use Case: Facilitates basic communication between users.
to one Chat:


● Media Sharing
○ Description: Users can send and receive images, videos, and audio files & all meta data will be removed before sharing media.
○ Use Case: Enhances communication by allowing multimedia sharing.
● File Sharing
○ Description: Users can share documents, PDFs, and other file types and all meta data will be removed before sharing the file.
○ Use Case: Useful for professional and personal file exchanges.
● Voice Messages
○ Description: Users can record and send voice messages.
○ Use Case: Provides an alternative to typing, useful for quick
and expressive communication.
● Terminate
○ Description: This feature allows users to completely delete chats from both their device and the recipient's device. Additionally, the users involved in the chat will be removed from each other’s contact list.
○ Use Case: Ideal for sensitive conversations that need to be permanently erased, ensuring no trace is left on either device.
● Wipe


○ Description: For security purposes, if user A provides a special code to user B, and user B uses that code, user A's account will be deleted along with all associated data. This is particularly useful if user A's device is stolen. To re-use the app, the user needs to manually re-install the app & need to create a new account.
○ Wipe will be done via website or user sending code to device.
○ Use Case: Provides a quick way to delete an account and all
its data remotely in case of device theft.
● Delete
○ Description: Deletes the chat history only from the user's device. The recipient's chat history remains unaffected.
○ Use Case: Suitable for users wanting to free up space or remove clutter without impacting the recipient.
● Shield
○ Description: Messages marked as shielded cannot be forwarded, screenshotted, or translated.
○ Use Case: Provides additional security for confidential information.
● Disappearing Messages
○ Description: Messages automatically delete from both devices after a set timeout.
○ Use Case: Perfect for temporary messages that don’t need to be saved.
● Voice Messages (Voice Changer)
○ Description: Allows users to record and send voice messages with the option to use one of three AI-generated voices and a pitch distortion slider.
○ Use Case: Adds fun and privacy to voice messaging.
● Auto-Destructive Media


○ Description: Media files (images, videos) self-destruct after being viewed once.
○ Use Case: Ensures sensitive media is not saved or shared after viewing.
● Abra Ca Dabra
○ Description: Texts are jumbled, making them unreadable to peekers until the recipient unscrambles them.
○ Use Case: Enhances privacy in public or crowded places.
● Mute Notification
○ Description: Mutes notifications for specific chats.
○ Use Case: Useful for reducing distractions from less urgent
conversations.
● In-Chat Search
○ Description: Allows users to search within a chat for specific messages or keywords.
○ Use Case: Helps users quickly find important information in lengthy conversations.
● Starred/Saved Messages
○ Description: Users can mark messages as starred to save
them for easy reference later.
○ Use Case: Ideal for bookmarking important messages.
● Chats Media Vault
○ Description: Media shared in chats is stored only in a secure vault. Users can share media out of the vault & it will be within the same app.
○ Use Case: Protects media from unauthorized access and ensures privacy.
● Block Contacts


○ Description: Users can block contacts to prevent receiving messages or calls from them.
○ Use Case: Provides a way to avoid unwanted communication.
● Accept/Reject Unknown Notifications
○ Description: Users receive notifications for messages from unknown contacts and can choose to accept or reject them.
○ Use Case: Helps in managing communication from unknown or suspicious sources.
● Voice Call (with Voice Changer)
○ Description: Voice calls with an option to use AI-generated voices for privacy.
○ Use Case: Adds a layer of privacy to voice communications.
● Emote Reactions
○ Description: Users can react to messages with emojis, similar
to WhatsApp or Signal.
○ Use Case: Enhances interaction and expressiveness in
conversations.
● Pin Chats
○ Description: Users can pin important chats to the top of their chat list for easy access.
○ Use Case: Keeps important conversations easily accessible.
● View Safety Number
○ Description: Users can verify encryption by viewing and marking safety numbers when adding a new contact.
○ Use Case: Ensures both users are using encrypted communication.


Group Chat Features
● Group Admin Management
○ Description: Admins can manage group settings, including adding or removing members.
○ Use Case: Provides control over group composition and dynamics.
● Secret Groups with Anonymous Names:
○ Create groups where members have anonymous identities.
● Group Permissions
○ Description: Admins can set permissions for who can send messages, edit the group description, invite users, and remove members.
○ Use Case: Ensures group order and appropriate participation.
● Group Profile Settings
○ Description: Admins can set the group name, profile picture, and disappearing message timer.
○ Use Case: Customizes group identity and privacy settings.
● Admin Powers
○ Description: Admins have the authority to terminate, wipe, or delete the entire group chat.
○ Use Case: Maintains control over group data and membership.
● Notification Settings
○ Description: Users can customize their notification preferences for group chats.
○ Use Case: Manages alert preferences to reduce interruptions.
● Exit Group
○ Description: Users can leave a group chat at any time.
○ Use Case: Provides flexibility to exit unwanted or inactive


Security and Privacy
● End-to-End Encryption
○ Description: All messages are secured with end-to-end encryption
using OMEMO + Post Quantum.
○ Use Case: Ensures privacy and security of communication.
● Two-Factor Authentication
○ Description: Users can enable two-factor authentication for added
security with additional pin or biometric.
○ Use Case: Provides an extra layer of protection for user accounts.
● Message Wipe Out (Server)
○ Description : Message will be stored in a server in an encrypted
way and it will be deleted as soon as message delivery has been
acknowledged at client side or 24 hours time limit is expired.
○ Use Case : To secure the messages at server database.


● Data Encryption at Rest
○ Description: Implementing SQLCipher with a user passphrase to
encrypt the SQLite database. The passphrase is only in memory when needed and is wiped when the app is closed. The SQLite database remains encrypted once the passphrase is removed from memory.
○ Use Case: Ensures data is secure even if the device is compromised.
● Cache Memory Management
○ Description: Every 30 seconds, the cache folder's memory will be
deleted.
○ Use Case: Prevents sensitive data from being accessible through
the cache.


● Vault Security
○ Description: The vault contains a zip file protected by a password
(encrypted). Images and videos saved in the vault are individually encrypted (SQLCipher) and stored in the zip file. Decryption occurs only when a single file is accessed.
○ Use Case: Provides secure storage for sensitive media, ensuring they are protected from unauthorized access.