NFC/RFID Sleeves - Part One: Understanding the Technology and the Threat
Technically U28 Maalis

NFC/RFID Sleeves - Part One: Understanding the Technology and the Threat

Key Takeaways:

RFID = Radio Frequency Identification (broad category)

NFC = Near Field Communication (subset of RFID, ~4cm range)

95% of US credit cards have contactless capability (2026)

Contactless cards transmit tokens, not real card numbers

Dynamic cryptograms change with every transaction

Multiple security layers built into the technology

Theoretical threat exists but is extremely difficult in practice

RFID skimming is negligible compared to actual fraud sources

Technologies Explained:

RFID vs NFC differences

How contactless cards are powered (electromagnetic field)

Tokenization concept

Dynamic cryptograms (one-time codes)

Transaction limits ($100-250 US, €50 Europe)

Security Layers:

Tokenization (not real card number transmitted)

Dynamic cryptograms (unique code each transaction)

Transaction limits (caps on contactless purchases)

No CVV or billing address transmitted

Short range requirement (~4cm designed range)

Threat Assessment:

Technically possible in lab conditions

Extremely difficult in real-world conditions

Requires: proximity, specialized equipment, technical knowledge

Provides: limited data difficult to exploit

Maximum gain: $100-250 per successful attempt

Compared to other fraud: essentially nonexistent

Coming in Part 2:Real-world fraud statistics

What criminals actually do

Data from credit card networks and law enforcement

Passport RFID security

.How RFID-blocking products work.

Does aluminum foil work?

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