I bought a 128 meg usb drive from radio shack because it was on clearance and fit on my keychain. I was trying to find reasons to use it and I found, pam_usb. PAM_USB allows you to store a dsa key on your usb drive that, when plugged in (it doesn't have to be mounted, just plugged in). Despite a scary description on the page, it was pretty easy to install. read more | digg story
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