Sony in Japan has been a popular target of hackers for years . PlayStation network was shut down in April 2011 when users stole files of 77 ##3 people . A spokesperson for the Ministry of Foreign Affairs tells CNN the hack is a `` United States issue . '' Former Sony employees are suing the company for failing to protect their files . Sony says attack reveals poor cyber - security among Sony 's ranks .
Sony in Japan has been a popular target of hackers for years . PlayStation network was shut down in April 2011 when users stole files of 77 ##3 people . Former Sony employees are suing the company for failing to protect their files . Sony says attack reveals poor cyber - security among Sony 's ranks .