1. Sony Breach
The PlayStation Network outage impacted 77 million account holders. The network was taken offline for more than 3 weeks while investigators attempted to contain a serious data security breach. Account holders to the PlayStation and Qriocity services had their username, password, and home and email address compromised. The Sony breach also impacted 12.3 million credit card holders. Credit card data was encrypted, but Sony said passwords were not encrypted and only hashed at the time of the intrusion. Hashing passwords leaves them open to automated password crackers. The attack is believed to have been carried out by attackers claiming to be members of the hacktivist group Anonymous.