Secure File Sharing System
A web-based file sharing platform designed around data privacy. Files are encrypted on the client before they reach the server, so the server never has access to unencrypted content, and recipients decrypt on their own machine at download.
- Year
- 2024
- Engagement
- Backend development
- Focus
- Backend, Full Stack
- Status
- Open source
01 — The problem
Most file-sharing services can read what you upload. For genuinely sensitive material, "we promise not to look" is a policy, not a guarantee.
02 — Our solution
Move encryption to the client. The server stores ciphertext it cannot decrypt, and decryption happens on the recipient's machine — so server compromise does not expose file contents.
How it works
The pipeline, step by step — from the first input to the final output.
- 01
Client encryption
The file is encrypted in the browser before upload.
- 02
Upload
Only ciphertext is transmitted to and stored by the server.
- 03
Share
The recipient is given access to the encrypted object.
- 04
Client decryption
Decryption happens on the recipient's own system.
What we built
The outcomes
01
A file-sharing service where the host cannot read the files
02
A working demonstration of client-side encryption in the browser
Challenges we solved
Key handling is the whole design
End-to-end encryption is easy until you ask how the recipient gets the key. That question shapes every other decision in the system.
Technology stack
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