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 numbersDynamic cryptograms change with every transactionMultiple security layers built into the technologyTheoretical threat exists but is extremely difficult in practiceRFID skimming is negligible compared to actual fraud sourcesTechnologies Explained:RFID vs NFC differencesHow contactless cards are powered (electromagnetic field)Tokenization conceptDynamic 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 transmittedShort range requirement (~4cm designed range)Threat Assessment:Technically possible in lab conditionsExtremely difficult in real-world conditionsRequires: proximity, specialized equipment, technical knowledgeProvides: limited data difficult to exploitMaximum gain: $100-250 per successful attemptCompared to other fraud: essentially nonexistentComing in Part 2:Real-world fraud statisticsWhat criminals actually doData from credit card networks and law enforcementPassport RFID security.How RFID-blocking products work.Does aluminum foil work?