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This discussion peaked my interest, so I went back and scanned all the badges I have going back eight years.What I found was that every badge, at least from 2008 and on, includes your name, full address, phone number, email address, and badge confirmation number.Starting in 2012, the bar code also includes what looks like a public-key encryption string. I'm not sure what that was used for.So yes, if you let a vendor scan your badge, they will have a lot of personal information about you.
As far as the RFID scanners at the event go, I suppose that could happen, but it depends on the amount of information they encode and how they secure it. I think using scanned information to create counterfeit badges would be unlikely because they not only need the chip information; they have to fabricate a plastic badge (presumably) with proper graphics and size which will not be known until just before the show.
Has anyone ever won anything from allowing vendors to scan your badge? I've gone for the last 10 or so years, and haven't met one person that won something. If anything, this is probably how we end up with spam emails.
I have a few times; last time was a $250 gift card to a prop replica place (can't remember name right now)Sent from my iPhone using Tapatalk
Someone on a con group on fb won a huge prize a few years ago. I've never won though but so many people enter though