I think those are simply combinations of "what you know" (juggling) and who you are (motions). Gait analysis is another possible example.
A variant of that might be the "anti-drunk driving" tools that you can install on cars now. In addition to the car key (what you have), one is presented with a random number that must be pressed into a keypad within a time frame. Fail, and the car will not start. Fail enough times swiftly, and the car locks down for a while.
There are defenses against man-in-the-middle attacks, as well as "replay" attacks.
I find this stuff amazingly geeky and fascinating.
PS The asymmetric problem solving of primes is the core of what is now know as Public Key Encryption. It is a fascinating variant of "what you know". Do you know much about it?
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branchandroot
no subject
Date: 2008-12-09 03:01 am (UTC)A variant of that might be the "anti-drunk driving" tools that you can install on cars now. In addition to the car key (what you have), one is presented with a random number that must be pressed into a keypad within a time frame. Fail, and the car will not start. Fail enough times swiftly, and the car locks down for a while.
There are defenses against man-in-the-middle attacks, as well as "replay" attacks.
I find this stuff amazingly geeky and fascinating.
PS The asymmetric problem solving of primes is the core of what is now know as Public Key Encryption. It is a fascinating variant of "what you know". Do you know much about it?