As part of my development journey, I developed YUEF - a secure, end-to-end encrypted messaging app using SwiftUI, CryptoKit, and Keychain.
The app allows users to send and receive encrypted messages, with private keys stored locally on their iPhone & iPad using Keychain. Key technologies include Firebase Storage, Auth, Firestore, and SDWebImage.

Used Technologies

• SwiftUI
• Apple CryptoKit
• Apple Keychain
• KeychainAccess
• Firebase Storage
• Firebase Auth
• Firebase Core
• Firestore
• SDWebImage

Features

Message Exchange

• Send and receive string messages
• Real-time message delivery and synchronization
• Support for text-based communication

End-to-End Encryption

• Implementation using Apple CryptoKit
• Secure message content protection from sender to recipient
• Encryption key management for each conversation

Secure Key Storage

• Utilization of Apple Keychain
• Local storage of private keys on iPhone

Message Timestamps

• Display of message send times
• Accurate tracking and presentation of message chronology