polybergen was 84. turning now to yet another major security breach at one of america's largest retailers, this time at home depot. what went wrong and why can't hackers be stopped. for more we're joined by michael riley a reporter with bloomberg. what happened at home depot? >> it wasn't that different than what happened at target. basically the hackers got into the network and were able to use home depot's own system to put malware on the system. when you went into home depot and swiped the card, they were stealing the card almost as quickly as home depot was getting it. >> sreenivasan: after seeing what happened to target-- this is a company with 80 billion in revenue, 2,000-plus stores in the u.s., didn't they learn from it? >> yeah, that's the thing. it's one thing to be target and watch this happen in a relatively new kind of attack. it's another thing to be home depot, watch target get taken down, lot of them lose 40 million credit cards, not elsewhere, or not learn nuf to act act quickly so it d