SDR-9

Zero-bandwidth P2P file sharing

WebRTC-based tunnel enabling direct browser-to-browser data transfer. No central server, no bandwidth limits — pure peer-to-peer architecture.

SDR-9 Demo

Tech Stack

WebRTCNode.jsSocket.ioTypeScriptReact

SecureTransfer relies on WebRTC Data Channels to facilitate direct communication between browsers.

The Handshake: The Sender creates a room, which generates a unique WebRTC "Offer."
Signaling: The Receiver joins via a shared link or email invitation. We use a Socket.io signaling server to exchange connection metadata.
The Connection: Once the peers find each other via STUN servers, the connection becomes purely P2P.
- Note: Success rates for STUN-based connections are typically around 80%. If a connection fails, it is usually due to restrictive firewalls (Symmetric NAT), not the software itself.
The Transfer: Files are broken into small chunks, sent over the data channel, and reassembled in real-time on the receiver's end.

Handling files over 1GB without crashing the browser was the primary challenge.

Memory Management: To avoid memory overflow, we don't load the whole file at once. We slice the file into ArrayBuffer chunks.
Reassembly: On the receiver side, we manage Uint8Array fragments, ensuring they are reassembled in the correct order to maintain file integrity.