What other information, besides names and email addresses, was compromised? So far, Epsilon has only admitted that names and email addresses were compromised in the breach. The company collects and sells a lot of other customer data, but it's not saying if any of that data was exposed in the breach.

Is there a complete list of all the companies affected by the breach? No. Epsilon has not released that yet. But blogger has complied a (growing) list of the companies that have notified their customers about the breach so far. are on that list, including Best Buy, Citibank, Disney, JPMorgan Chase, The Home Shopping Network, Hilton, Marriott and the College Board.

Jaikumar Vijayan covers data security and privacy issues, financial services security and e-voting for Computerworld. Follow Jaikumar on Twitter at or subscribe to . His e-mail address is .

in Computerworld's Security Topic Center.