I was thinking about the infamous "code purple error" for HP computers, where Windows is 
keyed to the hardware of the machine.  If you swap out a hard drive or change a card, it won't 
boot.  Apparently, there is a "tattoo" of various hardware identifiers in static memory 
somewhere and the OS matches a code put in during installation with that number.

For the HP issue, the fix is easy -- you just delete the command to check 
during boot up.  But, I was thinking about this as an encryption option -- 
where one could encrypt files in a way that automatically incorporates hardware 
information with the passphrase.  That way, if someone were to intercept a file 
and knew your passphrase, they would still not be able to decrypt the file 
unless they did it on one specific machine.

Is there anything like that for fedora?  It would probably be pretty easy to 
hack the gpg source code to add a few lines to append system information to the 
passphrase, but if there's something already around, I'd like to play with it...

billo
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