Voter registration data for over 19.2 million California residents has been deleted and held for ransom by attackers. Attackers left a ransom request for 0.2 Bitcoin (around $3,500 US today) Kromtech researchers say they have not been able to identify the owner of the database. They believe it could have been a political action committee or a specific campaign based on the unofficial title of the repository (‘cool_db’), but this is only a suspicion,” they say. This continues a series of cyber-extortion attacks that exploit the MongoDB database management system.”]