Феноменально!
Header

The library and its documentation you can find here: http://parall.ax/products/jspdf

Need to do cryptography in your Web pages? Of course you do. You might even have a real use for it. This library allows you to encrypt data using AES and create hashes to your heart’s desire. So, go out there and encrypt all the datas! http://crypto.stanford.edu/sjcl/