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
SHA256:5purSpiKcBx3CMkd9H0Ter1q7uVUrVUi2pYCJgLfEFY
Full public key
-----BEGIN PUBLIC KEY----- MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAroTCwRwrh94fR8X3W8CH QdYoconv3XIKRkvc7o2dfYshXG30+rJfdNzRKG1W93/KqPu6u3QWubJxrMOk+gnx H0oAjbxo7fbPRiRGm/SwNqkkF+Wdl0xGyfUV24WdPHKY+5K0wBBk7YF36e8nwXeX GHyJ1QTzm4sLLfIkd2FuuwIJ9vaVPmj7MymQfe3HizG/ZSWA7dKspKZpOGhCPAsq dr0HGsvuuRvtBX4eraLA1uSTWaBu8Q75loIUO45yOgIqvMVTsjbf2eVom9zQNYxT u6Ri81dRwtfqHz7WHGuIjo5atWN4XU2LDPhc1WWB7WpFnxL1pNYRM9b5LE2GtOr/ c7dePhBoDCkSDoAtwZlpv86QoNpFRt6uAnr898N8o5mg27hvtY16gakrcrN46vjH QY2fqOCBNZ2K+nstPcBnBfyPwyHejv5xEzU0kKCyiwZEC73TywI4Ih6uW/rhvYnh 5bunLinnpJPDmCSmbp5qSNM3L4yeVjaBGh3h05HdasvMEBsuQpy0/qa1edA6ps6I RZnZUrqLK6FFuR+bNMvIV4imWHhDAB1gRINyAy766syg80GesBMxqTlV5/SJJK4t rLXeFxpdNtdc20F4OJHrONqpYEqhdEayFAtsJ3eB736QOmMtdf3lWoTLIYy55zbh 1287BwxvBfnEZ6MoftzzAOUCAwEAAQ== -----END PUBLIC KEY-----