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NFC blocking sleeve for programmable tokens (large cards)
€1.00
NFC blocking sleeves lined with a metallic material that will block the NFC signal. Dimensions suitable for standard credit card size tokens / 86 × 54 mm
There isn't a way to extract the secret from the card, but it is theoretically possible to access its current time and read the serial number. Although the risk of replay attacks is practically close to zero, you can physically isolate your programmable tokens by keeping them inside the NFC blocking sleeves.
Blog
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