RSATool – Offline password handover

Exchange a password or short secret with RSA-OAEP (4096-bit) fully offline.

1. Generate RSA-4096 key pair

This stays in your browser. Share only the public key.

Public key (for Sender)

Send this to the Sender.

Private key (!Do NOT share!)

Keep this only for you. Do not share with anyone.

2. Encrypted payload from Sender

Ask the Sender to send you his 'Encrypted payload'.

Sender's secret

Do NOT share with anyone.

1. Public key (from Receiver)

Ask the Receiver to send you his 'Public key'.

2. Secret

You can type your own secret or let the app generate a random secret for you.

3. Encrypted payload

Send this value back to the Receiver.