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:A8HRtrFZF2gcz5PMkji8yXiRTwHttiXTDik0GvByDWs
Full public key
-----BEGIN PUBLIC KEY----- MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEA4DdqaGx6hLoczbwGDsOo Hqsyft8MJyWqLE6QFVET5IKjX+40RhAuQSD09/u0CwwEdCA9VkHf2U+fGSoYRuAQ UAKyj8emDV28q00AwJ1/sJahTQLzuLELO9RwXHEjr9ixFulgZTaj0HGlL59/2e30 y6MjoIZm+8GL8mMD0YZ6PPwShzCLDsJPXFrU1MA63OzenjlWlUEqwbFcxhVtEYwW 7fIYJ078lv9m4ebj97qnWImh+mZ9Gyr4D9YlXBC7LN0U89IFoXqeEabx93ePdRnG wpvFs2xVvD17Sfm2OKoYeGNXMaDhhaDPvpBp2zdZg4qnmJBwHnXhkzdDCbX4VYmO Cqk4HhgmJzfrplbNlMZX4rz2OgBJAaOilNYvni5ShKh8XGOpZ8IpyoZbOO7UhuaD 0WY1/k6Rg7fbZhFg5Y05YL0Sscr9Abz3txvLKufb+FDslMMOP1Lg8RjpS135tIVV QtYtNJlD6rNkCftuto3dfMXDTENRdeFHV39GRgvbcWVx9qsjKuE21VJG6dvA1LAc v/QZv3wLQSxkp1gWHl2kVMZU2GtFoRRAV8L6/J6pfSfI65ZM++hgWaX/ekKfmvff iwnPfwI52QAV+FID+P7rNEh1UhX4FYORNdMHMTwkBidopriJ2FwbJw6oDwED+wPG ZMZAZi+BPhfiiiOpdfFwOv0CAwEAAQ== -----END PUBLIC KEY-----