End to End Encrypted Chat App

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Inspiration

What it does

How I built it

ChallengesHere’s a clean, professional Devpost description you can paste directly. It’s written to sound impressive but clear 👇

🔐 End-to-End Encrypted Real-Time Chat Application

💡 Inspiration

With growing concerns around data privacy and message security, I wanted to build a chat application where users truly own their conversations. The goal was to create a real-time messaging platform that ensures only the intended recipient can read the messages, even if the data is intercepted.

🚀 What it does

This application enables users to communicate in real time using a secure, end-to-end encrypted chat system. Messages are encrypted on the client side using RSA public-key encryption and can only be decrypted by the recipient. Real-time delivery ensures instant communication, while secure authentication protects user sessions.

🛠️ How I built it

• Frontend: React.js for a responsive, real-time UI
• Backend: Node.js & Express.js for APIs and message handling
• Real-time Messaging: Pusher for low-latency event streaming
• Database: MongoDB with Mongoose for secure storage of encrypted messages
• Security: RSA encryption for client-side end-to-end encryption, JWT for authentication
• Deployment: Hosted on Vercel

🔐 Security highlights

• Messages are encrypted before leaving the sender’s device
• Only the receiver’s private key can decrypt the message
• Encrypted messages are stored in the database, ensuring data safety even at rest

🧠 Challenges I ran into

• Implementing correct key exchange while maintaining security
• Handling real-time message synchronization without exposing plaintext data
• Managing encrypted data storage and retrieval efficiently

🏆 What I learned

• Deep understanding of end-to-end encryption flows
• Building real-time systems at scale
• Designing secure backend APIs
• Handling authentication and secure data storage

🌱 What’s next

• Group chats with secure key sharing
• Message attachments with encryption
• Improved key management and rotation
• Performance optimizations for large-scale usage

Built With

• express.js
• javascript-(es6+)
• jwt-authentication
• mongodb-(mongoose)
• node.js
• pusher-(real-time-messaging)
• react.js
• rest-apis
• rsa-encryption-(end-to-end)
• vercel