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Originally Posted by MrGreg
How about a subcutaneous rfid chip so you can just wave your hand in front of the lock?
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In general, passive RFID is too easy to hack. Someone brushes up against you with a reader and they can copy your code. I'd rather not have something on me that told the world that I own an RFID key reader at home.
Active RFID powered by your bloodstream?... maybe!
Also, if you wanted to give your neighbors/family the keys to your house you'd have to inject them.
Lastly, they just generally aren't that available on the market. At least residentially.