The entire attack netted personal information on more than 100 million users making it one of the largest ever known leaks of consumer data.

Sony has spent much of the past three weeks analyzing the hack and rebuilding its network to better guard against future attacks.

The upgrades have brought "considerable enhancements to the data security, including updating and adding advanced security technologies, additional software monitoring and penetration and vulnerability testing, and increased levels of encryption and additional firewalls," Sony said in a statement. It has also added software to provide an early warning of system activity that could indicate an attack has taken place.

Throughout the period the PlayStation Network has remained offline, depriving console owners of the ability to play online.

"I can't thank you enough for your patience and support during this time," said Kaz Hirai, executive deputy president of Sony and head of its gaming division, in a statement. "We know even the most loyal customers have been frustrated by this process and are anxious to use their Sony products and services again. We are taking aggressive action at all levels to address the concerns that were raised by this incident, and are making consumer data protection a full-time, company wide commitment."