Unfortunately, McGruff the Crime Dog may be wrong. Crime can pay for many creative criminals who use sneaky means to swipe financial data, at least until they get caught. One method of financial crime is credit card sniffing. Sniffers don't touch your card -- they just steal its information as it passes over computer networks.
Originally, network administrators used sniffing to detect problems on their computer systems, and they've been using it for decades. Sniffers are so legitimate they are made by major software companies. However, the software's power to intercept traffic for legal purposes can also be used for illegal ones, like detecting the transmission of credit card numbers.
When criminals sniff credit card information, they compromise the networks that transmit the data. By installing sniffers at corporate servers, they are able to capture all of the information that flows in from the company's credit card terminals. This allows them to steal thousands or millions of credit card numbers and capture enough information to make fake cards or do online transactions with them.
Sniffing the Air
New credit cards that contain chips to allow you to do "swipeless" transactions can also allow credit card skimming, or sniffing on a much smaller scale. Despite its benefits, "near field communication" technology can let thieves connect to your card and take its data, using radio frequencies. Now that this NFC technology is being built into cellphones, credit card thieves can use an app to steal credit cards and then use the phone like a stolen card.
To protect yourself from NFC skimming, you can ask your credit card company for a card that doesn't allow swipeless transactions -- or you could buy a metal-lined wallet that blocks NFC transactions. Guarding against large-scale sniffing is harder because it happens at a level that is usually out of your control. The best way to protect yourself there is to keep a close eye on your credit card bills and debit card statements. If you see any charges that don't look familiar, contact your card company immediately.
- SANS Institute: Global Information Assurance Certification Paper
- Network Computing: The Ten Most Important Products of the Decade
- Wired: International Hackers Indicted for Sniffing Credit Cards From Dave & Buster's
- KOMONews.com: Digital Pickpockets Using Smartphones to Steal Credit Cards
- Federal Trade Commission: Protecting Against Credit Card Fraud
- Federal Trade Commission. "Warning Signs of Identity Theft." Accessed March 17, 2020.
- Federal Trade Commission. "Equifax Data Breach Settlement." Accessed March 17, 2020.
- Federal Bureau of Investigation. "Scams and Safety—Skimming." Accessed March 17, 2020.
- Federal Trade Commission. "Tips for Using Public Wi-Fi Networks." Accessed March 17, 2020.
- Federal Trade Commission. "How to Spot, Avoid and Report Tech Support Scams." Accessed March 17, 2020.
- Federal Trade Commission. "How to Recognize and Avoid Phishing Scams." Accessed March 17, 2020.
- Federal Trade Commission. "Protecting Against Credit Card Fraud." Accessed March 17, 2020.
- Federal Trade Commission. "The Dark Web: What Your Business Needs to Know." Accessed March 17, 2020.
- Federal Bureau of Investigation. "Credit Card Cloners Stole Thousands." Accessed March 17, 2020.
- Federal Trade Commission. "Lost or Stolen Credit, ATM, and Debit Cards." Accessed March 17, 2020.
- Discover. "Report Lost or Stolen Card." Accessed March 17, 2020.
- Capital One. "I Need a Replacement Credit Card." Accessed March 17, 2020.
- Federal Trade Commission. "How to Keep Your Personal Information Secure." Accessed March 17, 2020.
Steve Lander has been a writer since 1996, with experience in the fields of financial services, real estate and technology. His work has appeared in trade publications such as the "Minnesota Real Estate Journal" and "Minnesota Multi-Housing Association Advocate." Lander holds a Bachelor of Arts in political science from Columbia University.