NFC/RFID site for hacking and possibly sales
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Reading an article about using passive means to increase antenna read size, I found this page (https://dangerousthings.com) on NFC/RFID hacking, One of the main things they have is the implantable RFID, but they talk about both aspects of contactless. I thought maybe it may be a good place for @John to sell the rings. Even though the site sells the implantable kits, some people who get them to open doors and start cars may want rings for family that may not want to get a chip implanted, but still need access and a ring is more personal than carrying an extra chipped fob.
