This year\u2019s crop of Super Bowl ads includes plenty of the usual suspects: expensive cars, cheap beers, big tech. But among the companies coughing up a reported $5.6 million for 30 seconds of Big Game glory is one name most people have never heard of, selling a product that many don\u2019t know exists: Dashlane, an app that manages your passwords. It\u2019s not that password management is entirely novel.