Mylar - Store Encrypted data on the server. Built in JavaScript.

A project from MIT called Mylar is a platform for building secure web applications.

Mylar stores encrypted data on the server and decrypts data only in the user's browser. Mylar protects data on the server even if an attacker gains access to your server. An attacker would only have encrypted data. This opens up other applications such as preventing governments from gaining access to data. Simply put if only the user can decrypt the data then no government can view the data.

Project Page: http://css.csail.mit.edu/mylar/

Article:http://www.dailytech.com/New+Encryption+System+Mylar+Encrypts+Data+in+Browser+Before+Reaching+Server/article34593.htm