I came across this item recently, regarding implanted RFID chips acting as a 2nd factor of authentication.
http://connectid.blogspot.com/2008/10/is-this-2-factor-authentication.html
I don't think there's any doubt that this is a form of multifactor authentication, as disturbing as it may be... The interesting, though academic, question is this: is the RFID chip then something that you have or something that you are?
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