Lock a secret for Boo
Hand over a password, key, or token without pasting it into chat.
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Lock it in this browser
Your browser encrypts it with Boo’s public key. The readable value never leaves this page.
.boosecret -
Send the file to Boo
Drop the downloaded file into your chat with Boo. Only Boo can open it.
Locked
No file in your downloads?
If nothing downloads, open this page in Safari or Chrome instead of an app’s built-in browser.
Is this safe?
Yes. Your secret is encrypted on your own device, inside this browser tab, before anything is sent anywhere. The readable value never travels over the internet and never lands in a chat history.
Who can read it?
Only Boo. The key that opens the file lives in Boo’s private vault. Nobody else can open it: not the Boo team, not anyone with database access, not any other Boo.
What do I do with the file?
Send the downloaded .boosecret file to Boo and say what it’s for. Boo opens it privately and uses it, without ever showing the value back.
The locked file is safe to send anywhere: a public channel, an email, a shared doc. Even if someone else sees it, only Boo holds the key to open it.
What kind of encryption is this?
Standard, audited encryption built into your browser. Nothing homemade. A single-use AES-256-GCM key seals the secret and is wrapped with RSA-OAEP (SHA-256), all via your browser’s built-in WebCrypto. No third-party scripts, no tracking, and no network calls once this page loads.
You can check the public key your secret is locked to.
Key fingerprint
SHA256:uG0OHj221EHLGdAmNj9ye9Lol8HrYjeepJ0Qj9+BApY
Full public key
-----BEGIN PUBLIC KEY----- MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEArnQuJwTKCyJ+ALZuR57L d9r4rituUJS2jNX3TJd2+kRAL52a0aQp7B3BitrgoXAz2R4Be7lUVmxrlQrjSqgr w+HL38nJDc7HJuixhcSBoOFfK7EE+xTTHkqCjWcUMza/vDcMP6es6GUXKQjfzpFb myaG//J+R9xlYxbPBVLrXAg45D1vIBWUaS+Ftb4VVjtdgVOUDrEoePVGeVQSITm9 h9N9t3E0xZCKjz0yu6vssixE3u6TIJeOGEBjJzzKvweTTWArdbelhuSG9+81orcb pdIU7e+vOphtP0d712v68Nz6tNEDB767g4vTk/0/5F7MCgTFt7YAqn6e3TV31tn2 xfo/lQOYYO3Y6iYiTOj7mMCQisAT39eOxkakyhPecp5PmloOiejzTBaqoQxgAc+o aOki8Glc81qqGx2FUfOxizdM7wXVWA1A0pdZszbTHzbUfdQT4jInwi15mcwFOFlC eXaBa4pG4PZaL5+nTHPRcvc2rELDMj7JBrfuwBo0G6jhfQgHH8Q1JsHXxDtLpmlp pwzMqnY8GyerwFw13jMUvt5/4v4UIteFkP65EK5NKmBcQI+5DhHogPQCGx29nnUP BXLZFby6an5vpgYcLjz5eDyqLItlnTIt3b+3AZw5YkWw3FnSppLbRSARqRkQl9U7 R9uUTe0FNumi4EUHXUujH3kCAwEAAQ== -----END PUBLIC KEY-----