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:ow8Qwe7BA9mEjBT0R11slC3rflUcJrtQcjY34CtZnXY
Full public key
-----BEGIN PUBLIC KEY----- MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAsO91YbaCg71METBikgCn tTLQQjy+rDal1BTC5p9FYsLCjy5yrLg10w9/2PQ2HVIjvr1mRtqU3RjO/eiHgScM 718HgdP9qVjIXTG2ueDqYU5hYMtj+6Lc9hdCjgbl5jMIy/mwa8Rtvvb6r3Dgvv9z Lz56mbQuMnzcvJQZjdU32CoZVZI15nNlzLg0rfXZkQA9bBTnW0IAYu0uzKxVEYvQ tNPzWRjIlsA40J7AiY9C/YPZPnT5MHB/OW4EihXSr/2VH0+jdsnHZ80ENNoueudg Kzqww6bKPkTjiTg3hoFJ9d5kCD3SjEMc/HqyAEYd3W9tzYcjwyn3FNtMw72n+BRJ xw+rDh+zlEnAzPEiTtr7NAeujc9YmhQLu1EvtQ2wNf3gdzqjoSMl0zmUvk8XsGjJ FVknyq361OV/23TP4V4dp4WTr/JEPbadUCgUdMkp/to8UCax//vzBR48JYcxlRxE 2pPUutv5mofGwW8LHmqlbBKU9xUG0uoHMS6DlW3i9Kofjd5rFx4TylzsoeH7R3hb DtzOWFkW7Mh/sKPp6hTY7H5o9WktJoz4XgSOZ4A103kybT8i0Y/ABdR0VZH00WzE uUINUQlLC7Qwyme3nc9b2hah/HyyF9Ot+TJBd2Ii5u7GUjTObFmITGeMdhQukSeo FZm+/9a+tcHMKI+MRQ/JwKECAwEAAQ== -----END PUBLIC KEY-----