: Large-scale hacks of company databases can expose millions of card details at once.
Credit card data typically enters underground marketplaces through several illicit methods: buy credit card numbers
Carding-as-a-Service: The Underground Market of Stolen Cards : Large-scale hacks of company databases can expose
: Physical devices installed on ATMs or POS terminals, and newer "digital pickpocketing" techniques, capture card data from unsuspecting users. and newer "digital pickpocketing" techniques
The Underground Market of Stolen Credit Card Numbers: Risks and Realities