Department of Homeland Security, National Cybersecurity and Communications Integration Center, Sony PlayStation Network Compromise (Apr. 28, 2011) (full-text).
On Tuesday April 19, 2011, Sony learned its PlayStation Network and Qriocity Networks had been compromised by unidentified actors. Sony closed down the two networks on April 21 and publicly announced the compromise the following day. On April 26, the company disclosed that personal information had been stolen. The information included names and addresses of users, their birth dates, e-mail addresses and possibly other information including credit card numbers.