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A file sharing application that encrypts files on the sender's device and lets only the intended recipient decrypt them, with expiring links and download limits.
Problem Statement
Sensitive documents are routinely shared over email and chat, where they remain stored and readable indefinitely.
Objectives
Encrypt files before upload
Exchange keys securely between users
Add expiry and download limits to shares
Keep an audit log of access
Modules
Encryption Module
Hybrid encryption using public keys and symmetric file keys.
Sharing
Recipient selection, expiring links, and passwords.
Storage
Encrypted file storage with integrity checks.
Audit Trail
Who accessed which file and when.
Expected Output
A web app where a file sent to a recipient can be opened only by them and disappears after the expiry time.
Future Scope
Large file chunking, digital signatures, and mobile apps.