Encrypt
Your text or images are protected with a fresh AES-256 key and authenticated encryption.
Browser-based encryption & key splitting
One secret,
split across many keys.
RivenKey encrypts your text or images in the browser with AES-256, then splits the encryption key into several shares using Shamir's Secret Sharing. You choose how many shares exist and how many are needed to unlock it. Nothing is uploaded or stored — it all runs on this device.
AES-256-GCM
Shamir secret sharing
Works offline
Recommended
Holder packages
One separate ZIP per holder, each containing only their key share.
Encrypted data
encrypted-message.txt
—
Every key is on screen at once. Anyone who can see it — a photo, a screen-share, someone reading over your shoulder — can decrypt the content. This is here to make the mechanics easy to follow; use Secure mode to hand out a real secret.
Shared with everyone
Encrypted data
Original images, in their saved order. Scan each QR with the receiving app, or download the original file.
Under the hoodHow it works,
How it works,
in four steps.
Split
The random key is divided using Shamir’s Secret Sharing with your chosen threshold.
Distribute
Give one unique share to each trusted person through separate secure channels.
Reconstruct
Combine the threshold number of shares to restore the key and decrypt locally.