The Hidden Risk in Every File Sharing Link (And the Zero-Knowledge Solution)

Every time you share a file via Google Drive, Dropbox, or WeTransfer, you're making an implicit trust decision: I trust this server to not read my file. For most files, that's fine. For sensitive files — contracts, credentials, medical records, source code — it's a significant risk that most developers ignore. The Problem: Server-Side Trust When you upload a file to a typical sharing service: Your file travels over HTTPS to their server Their server stores it (usually encrypted at rest, but they hold the key ) They give you a share link The server itself can read your file. So can employees with database access, law enforcement with a subpoena, and attackers who compromise their infrastructure. What "Zero-Knowledge" Actually Means Two conditions must both be true: Client-side encryption — the file is encrypted before leaving your browser Key never reaches the server — the decryption key is delivered out-of-band HTTPS alone does not count — the server decrypts on arrival. Server-managed