Embeddable html form to allow encrypted messages for your public key

The keybase encryption form (e.g. https://keybase.io/encrypt#chris) is a great interface; it would be great to have a way to embed this form in your own website without having to write your own html encryption code.

Start by reviewing the existing Keybase encryption form at https://keybase.io/encrypt#chris and the issue's embedding goal; no repository file, test, or entry point is identified. Define the integration scope and security requirements before implementation, with done meaning a website can embed a working form that encrypts messages for its public key without custom encryption code.

Written by the indexing model from the issue text.