Dropbox last week confirmed that more than 68 million emails and passwords have been compromised from a hack that originally was disclosed in 2012. Exposure from the breach was limited to email addresses, Dropbox originally claimed. However, based on the latest revelations, the hackers actually stole hashed and salted passwords. Even so, there have been no indications that they succeeded in accessing user accounts, the company said. The firm apologized for the belated release of the information, saying it wanted to clear up the confusion.