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How I type when I'm well is extremely different to when I'm not well. The start of a simple cold will change your rhythm and speed a lot. Thus the system you mention will not allow me in when I'm in a different state of health. Even using a different keyboard or extra stuff sitting on the desk will change typing rhythm and speed as you reach over it or around it.

Password and user name is the easiest and cheapest system to date. Some of the bio-id systems would come next, but the good ones aren't cheap and the cheap ones aren't good as they can be easily tricked.