Show HN: Tweet with encryption

I've just enhanced BoxupText to encrypt a tweet before sending it to Twitter. This allows tweeting to a selected set of followers, who know the password to decrypt the tweets.

Encryption is done entirely on the browser to ensure privacy. The following precautions are taken to minimize the security risks.

- All web content (html, css, js, images) come from the same server.

- No download from any 3rd party websites or CDN.

- Use SSL certificate for all content to prevent code injection along the way.

- Encryption and decryption are done on the browser.

- Nothing is submitted to the server and no input shown to avoid XSS.

- URL fragment is used for encrypted data which stays on browser.

- The web pages can be downloaded and run off from the local file system.

- Have as few dependencies as possible, just: SJCL, Bootstrap (css), and html5.js.

- Keep things simple for verification.

Please review the app and code to see if there are any security concerns. Thanks!