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You should use smart cards. They can handle crypto and only disclose their contents on presentation of a key, as well as encrypting the reader/card communication so sniffing won't work. For contacted cards I guess a PKI card would work, where the card proves it has the private key to a particular certificate, and you use that to pull the user's record from ...


You can issue shielded containers for the cards. These are plastic sleeves that feature a thin sheet of metal on either side of the sleeve, making it impossible to scan the card. When the user needs to authenticate or verify, they can simply take the card out. There are more luxurious shielded containers that separate the plate from the card when pinched ...

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