In the wake of a massive data breach that exposed the personal information of about 70 million customers last year, Target CEO Gregg Steinhafel is stepping down, the retailer's board announced in a statement Monday.

The credit and debit card data breaches at Target and Neiman Marcus compromised more than 70 million American consumers, and analysts say even more of us are at risk. That's because the technology we use to swipe for our purchases — magnetic stripes on the backs of cards — isn't hard for a skilled fraudster to hack.