I'd like to join three ideas into one interesting and sometimes useful feature. There was a question about using multiple passwords earlier this year, but it didn't receive much attention. I'd like to ask the question again after showing an interesting and new way to use the feature. The three original posts I found to be interestingly combined were:

(1) Multiple passwords per user

(2) http://blog.littleimpact.de/index.php/2009/09/14/automatic-encryption-of-home-directories-using-truecrypt-62-and-pam_exec/

(3) http://www.truecrypt.org/docs/hidden-volume

Basically I'd like to login to my account with two passwords and depending on the password I use, I would get a different content in my home directory. In a way I would get a cryptographically hidden account into my system. So the question is, is it possible to allow multiple passwords to log on to Ubuntu/Linux for the same user?