Project Summary:

SecureSend is a privacy-first web application that allows users to send sensitive files securely over the internet with end-to-end encryption, access control, and self-destruct options. It is ideal for professionals, legal teams, journalists, and privacy-conscious users who need to transfer confidential documents without exposing them to cloud storage risks or unauthorized access.

 Core Objectives:

• Ensure zero-knowledge file transfers, where even the server cannot view the content.

• Offer self-destructing links based on time or download limits.

• Provide a simple, clean UX for secure file exchange with no login required.

 Key Features:

1. End-to-End Encryption (E2EE)

• Files are encrypted in-browser before upload using a symmetric AES-256 key.

• The encryption key is never sent to the server – it’s embedded in the sharing link.

2. Self-Destructing Links

• Files are automatically deleted after:

  • A fixed number of downloads (e.g. 1, 3, 5)

  • A set expiration time (e.g. 10 minutes, 1 hour, 24 hours)

3. Password Protection

• Optional password required to open the file link.

• The password is not stored or sent to the server; verified client-side only.

4. Access Logging & Controls

• Notify sender when a file is accessed (optional email or webhook).

• IP/geolocation of downloader shown in sender dashboard (privacy-aware mode).

5. No Sign-Up Required

• Users can upload and share without creating an account.

• Premium users can create accounts to track uploads, access stats, or manage files.

6. Drag-and-Drop UI

• Clean, intuitive file uploader with progress bar.

• QR code generation for quick mobile downloads.

 Architecture Overview:

Frontend (Client-side):

• Built with React (or Vue.js) + TypeScript

• In-browser encryption using Web Crypto API

• File slicing and progress tracking

Backend:

• GoLang or Node.js (Express) for high-performance handling

• File storage using:

  • AWS S3 (with pre-signed URLs)

  • Optional: local temp storage with auto-purge cron jobs