I want to create an usb stick which contains an ubuntu installation that:

• can be used as a working environment (Covered in: How do I install Ubuntu to a USB key?) - ie the ubuntu installation on the stick must provide an accessible home folder.
• Is completely encrypted.

I intend to use it as a secure environment to work on sensitive customer data - and also need the system on the stick to be able to connect to the internet. How do I realize the complete usb stick encryption?

I am also very thankfull for any further articles and ideas on this topic!