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:Eb2+Xdk5aXbH3RVOM4/42CDDhyiB47Yal7tjSjKfoGw
Full public key
-----BEGIN PUBLIC KEY----- MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEA4ABuocLIysN0lzmMuTSi Fb3JFFjRK0OP9QMHkTI6jjmhmvDuCDAglVWGM0gllUVK/cxVzkEeBRS33SXaTDKD uSHXpxKf00eNRsqR5PP2tzXoRGCXtxd5Bo7wL4rzm8OiYFdySp/G/+sl0ANHr0qa WTtdl6QkATrLojy6TsrvSrvV2U5orhYDZWnkGB5zsEGM4eIF8qSo9fA9beCPCRW5 gvPWLWxU3ZDbX1SbxuTcWOfZDaZrCCPp+HpDrce0tWj0BLP72Mewbi+rYfjf6cXH XPijUW0Au/JA0DKJeaNuDjoPfcULXHp16vJ7dDoAFJAzRJdO+3jfNCJuxPEaApCS 5r1CUX9ABYaF4O7cVs5peJ7PJkqjbuGAfdDmfmeYdUIDbku5YjBTyNDpj4sediCM 5kqEpyd3x/gqY8bXMVwq3LhS1rFkUTZ00qUcaVBgQNKEUDT6v9wDcjMQn1kasHNE yymu5cukBnhQFHWuLYqnjF1MgHXNynW9kbYfaZe7ku2mpI0W5dcfkIfqYJQyDBMf ZOW+/bjnwLSOICtiH4LVgunWPOI2g1oXySUQzhCI/5BNue7P+KwCWA2Aw7maHFlp VTjiHU8s4GInpC8os6H5imi3FJBo22GyWFfyL/CJ2bhpIwf4vXYtKdmldEPdie12 QLrDGVdxfqlzHXkbI4MympUCAwEAAQ== -----END PUBLIC KEY-----