Can someone read your NFC card without your permission?
In theory, someone could read your NFC card without your knowledge if they get within 4 cm without you noticing. In practice, this is nearly impossible in normal situations — getting a phone within 4 cm of a card in your pocket, wallet, or bag undetected is not a realistic attack.
Why proximity makes unauthorized reads impractical
4 cm is shorter than a typical thumb. Getting close enough to read an NFC chip without the card holder noticing requires physical intimacy that would be immediately apparent. Unlike Bluetooth or Wi-Fi skimming (which works at meters), NFC skimming requires literal contact or near-contact. No crowded subway scenario, no 'walk past with a reader' attack is practical with standard NFC chips.
What they'd get if they did read it
They'd get a public URL pointing to your profile — the same URL printed on your card, discoverable on LinkedIn, or shareable with anyone via text. Your NFC business card profile is intentionally public information. There's no sensitive data on the chip worth the effort of a proximity read.
Can someone use an NFC reader at close range in a crowd to steal data?
Your NFC business card chip contains only a public URL. Even if someone read it in a crowd, they'd get your profile link — the same info you're actively trying to share. Payment cards are a different concern.
Is there such a thing as NFC skimming for business cards?
NFC skimming as a concept applies to payment card data theft. Business card chips store only a public URL, so there's no 'skim' worth executing.
Should I use an RFID-blocking wallet to protect my NFC business card?
No need. You want your business card to be readable. RFID wallets are used to protect payment cards, not networking cards.