Purdy Interview on Nasdaq Cyber Attack

March 31 (Bloomberg) -- Donald "Andy" Purdy, chief cybersecurity strategist at Computer Sciences Corp., discusses the October cyber attack on Nasdaq OMX Group Inc. The National Security Agency is said to have joined an investigation of the attack amid evidence the intrusion by hackers was more severe than first disclosed. Purdy speaks with Erik Schatzker on Bloomberg Television's "InsideTrack." (Source: Bloomberg)