So I just read the following story about how a company is requiring people to have an RFID tags implanted under the skin to have data center access. I must say I am not against this idea. I like the idea of an internal method of verifying your ID. The problem though, as this company found out later, is that the current technology is easy to copy. Right idea with the wrong advancement I guess you would say. If it is two factor I suppose it would still be fairly secure. How about two factor with a third factor being a known seed?