Send Sensitive Data Safely Online: Zero-Trust WebRTC Guide

The Risks of Centralized Storage

Sharing sensitive documents online (such as legal contracts, financial audits, medical records, or proprietary source code) requires strict security. Traditional cloud drives and email platforms save your files on third-party servers. This model exposes your data to security vulnerabilities, including database breaches, employee access, or unauthorized scans. Even when services claim to encrypt files, they often retain the decryption keys on their servers. To protect your privacy, you need a zero-trust model where only you and the recipient control the keys.

Our platform uses a zero-trust model to protect your data. All encryption and decryption tasks run locally inside your browser's memory using AES-256-GCM. Unencrypted data never leaves your device. The cryptographic key is kept locally on your machine and is never shared with signaling servers or outside databases, ensuring complete privacy during transit.

Additionally, files stream directly between devices using WebRTC, bypassing intermediate servers. This direct path prevents data from being stored in the cloud, removing the security risks of centralized hosting.

How Zero-Trust Web Cryptography Works

Our zero-trust architecture relies on the Web Cryptography API built into modern web browsers. When a file is selected, the browser generates a cryptographically secure random key locally. It then encrypts the file data using the AES-256-GCM algorithm, generating a secure ciphertext block and an authentication tag.

The decryption key is appended to the sharing URL as a hash fragment (the part after the # symbol). By web standards, this portion of the URL is never sent to the host server during HTTP requests. This means only the sender and the receiver have access to the key. This zero-knowledge approach guarantees that your files cannot be intercepted or read by anyone else, offering top-tier security for all your transfers.

Because the key is never shared with signaling servers or database systems, the platform itself cannot decrypt your files. This design ensures that even if the signaling server is compromised, your data remains fully encrypted and secure.

Direct Channel Isolation

Once the keys are established, the browsers use WebRTC to set up a direct connection. This connection is secured via DTLS (Datagram Transport Layer Security), which encrypts the data stream at the transport layer. This double-layer encryption (AES-256-GCM at the file layer and DTLS at the transport layer) protects your sensitive data from network-level interception.

This direct approach also simplifies compliance. Because files are not stored on remote servers, you do not need to worry about regional data storage regulations or third-party processor compliance, making it an efficient choice for corporate security.

Frequently Asked Questions on Secure Sharing