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All pictures shown are for illustration purpose only. Actual product may slightly vary due to product enhancement or other reasons.
NFC blocking sleeve for programmable tokens (large cards)
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
05-03-2026
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Most TOTP apps work by distributing copies of the secret to every person who needs access — fine for personal accounts, but for shared service accounts it means MFA secrets scattered across people's phones with no clean way to revoke access when someone leaves.
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