Millions of Americans who don’t have health insurance can now buy it through a system of online exchanges put in place by the Affordable Care Act. The computer system at the center of the health care overhaul is supposed to connect customers and insurance companies with seven federal agencies — from the IRS to the Social Security Administration. But there have been big questions about the security of personal data and whether the system will function properly.

Chester Wisniewski, senior advisor at the cyber security firm Sophos, joins Marketplace’s Mark Garrison to discuss. Click on the audio player above to hear more.