Hi All, Has anyone here ever dealt with multi-user authentication? I'm trying to set up a system that would require two separate users to authenticate before running certain programs. This adds a level of accountability to the system and could be very useful. I was thinking something on the lines of using pam_usb and sudo to control execution, but theres a couple things that I'm a little fuzzy about. Is there a way that if one of the usb keys got pulled out, the programs being run by sudo would be 'kill -9'ed? Can pam_usb be used to require two keys? I'm sure you could cheat, and link the two keys using a software raid, that would make sure that you need both. But if you wanted to require that two users out of 3 (or 4 or 50) can use this, you would need a lot of keys and a lot of raids. Thanks Chris