Inspect your credit card, and you’ll likely find interesting—and crucial—elements of the plastic rectangle. The front might display the provider’s name, a chip, some digits, or an entire card number; the back might hold much the same, along with a signature, when necessary, and a “valid thru ” date. All the information on a credit card is necessary to conceal, but when data breaches happen more often than ever, it’s a matter of time before every card is online.