The action appears to be related to continue fallout over the massive hack on LinkedIn in 2012 where credentials for 117 million accounts were posted online.
In recent months, treasure troves of user credentials and passwords — in addition to a large MySpace hack disclosed in May — have been discovered.
Even though the data for these accounts is old, often passwords remain unchanged for long periods of time and re-used across multiple accounts, leaving entire online identities vulnerable to hacks.
Dropbox s intelligence team identified the existence of a file that contained unencrypted passwords, according to a person familiar with the matter.
While the information appears to have been taken from then and quietly held for some time, it is now surfacing, this person said.
Dropbox earlier disclosed that usernames and passwords that were obtained in 2012 were used to access some accounts.