Frozen copy of the original Encrypt app (July 2026) — kept online unchanged so anything encrypted with it can always be decrypted by the exact same code. Go to the current version
Encrypt / Keys
Key exchange
A passphrase means both sides have to agree on a secret first. Public keys remove that step: publish your public key anywhere, and anyone can send you a message that only your private key can open. The keys are made in your browser (ECDH on curve P-256) and never uploaded.
1 · Make your keypair
Save your private key somewhere safe — a password manager is ideal. We don't store it, so if you lose it, messages sent to you can't be opened.