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| from here and here (image source) |
In terms of authentication, keys have traditionally represented tokens or "something you know", while body parts are usually consider to fall under the heading of "something you are" such as biometrics, but what happens when you combine the two? If it's attached to you is it really still just something you have? And biometrics aren't strictly about your biological components. If you have a prosthetic nose, do you think face recognition isn't going to use it? Of course it will.
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