If you have any doubts about the need for a new corporate cybersecurity mindset, the daily news contains plenty of sobering evidence. Recently, Yahoo Inc., which was in the midst of a planned transactionto sell its core businesses to Verizon, disclosed that it had been the target of two of the biggest data breaches ever, with sensitive information stolen involving more than 1 billion user accounts in 2013 and500 million in 2014.