For maximum security, end-to-end encryption ensures that only people with your share link can access file contents. Not even the server can read your files.
What is End-to-End Encryption?
- Files are encrypted on YOUR device before upload.
- The encryption key is part of the share link.
- Server stores only encrypted data.
- Decryption happens on the recipient's device.
Why E2E Matters
Server Breach Protection
Even if servers are compromised, encrypted files are unreadable.
True Privacy
No one—not even Rune—can read your file contents.
Regulatory Compliance
Satisfies strict data protection requirements.
How to Enable Encryption
- Upload file to Rune's File Share.
- Toggle "Enable Encryption" on.
- File encrypts in your browser.
- Copy the share link (contains decryption key).
- Share the link.
- Recipient's browser decrypts on download.
Understanding the Link
The share link contains:
- File identifier (public)
- Decryption key (in URL fragment)
The key portion is never sent to servers.
Security Comparison
| Sharing Method | Server Access | Intercept Risk |
|---|---|---|
| Regular upload | Can read | If intercepted, readable |
| E2E encrypted | Cannot read | If intercepted, encrypted |
When to Use E2E
- Highly confidential documents
- Sensitive personal information
- Financial data
- Medical records
- Trade secrets
Combining with Other Features
- E2E + Password: Double protection layer
- E2E + Auto-destruct: Single access, fully encrypted
- E2E + Short expiry: Time-limited, encrypted
Trade-offs
- Slightly slower upload (encryption time)
- If you lose the link, file is unrecoverable
- No server-side features (preview, etc.)
Conclusion
E2E encryption provides the highest level of file sharing security. Rune's File Share makes it simple to enable.