CHARLESTON, S.C. (AP) -- One of the world's leading cyber security experts says information from a hacking incident like the one in South Carolina is usually sold quickly on the Internet black market. Michael DuBose says hackers sell Social Security and credit card information in batches of thousands on the Internet black market and the chances of finding and prosecuting the hacker are generally slim.
DuBose is former chief of the U.S. Justice Department's computer crime section and now works for international cyber security company Kroll.
Authorities are investigating the hacking of 3.6 million South Carolina tax returns.
They say the hacking came from an international IP computer address. But DuBose says it's easy for hackers to remain anonymous and the portal could have been a proxy for a site anywhere in the world.