Gamers and security experts had criticised Sony for its handling of the incident, which sparked lawsuits and cast a shadow over its plans to combine the strengths of its content and hardware products via online services.
The Japanese electronics and entertainment giant apologised to customers for the outage, and said a range of new security measures had been introduced. These included an early warning system that could alert the company to any attempt to penetrate the network.
"I can't thank you enough for your patience and support during this time," Sony No. 2 Kazuo Hirai said in the news release, which was also posted as a video message on the PlayStation Network blog.
"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."
A single message from a PlayStation Network user under the name SG-1_F-302 on the blog read simply: "Thank you Sony!!!!"
But some users have said the prolonged outage has prompted them to switch to rival Microsoft's Xbox Live games service.
In what is thought to be the biggest security breach of its kind, hackers accessed personal information on 77 million PlayStation Network and Qriocity accounts, 90 percent of which are in North America and Europe, and may have stolen credit card information.
Hackers rented a server from Amazon for the attack, Bloomberg news said earlier in the day, citing a source with knowledge of the matter.
Sony discovered unusual activity on its PlayStation Network, which enables games console owners to download games, chat with friends and pit their skills against rivals, on April 19.
It shut down the network and its Qriocity online music and movie service, frustrating many users, but waited almost a week before alerting users to the extent of the security leak.
The company later found out that a separate online games service had also been penetrated, allowing access to another 25 million user accounts.
PROCESS TO BE COMPLETE BY MAY 31
Sony said the restoration of PlayStation Network and Qriocity online movie and music services would take place on a country by country basis and that it expected the process to be complete by May 31.
Sony Online Entertainment services are also being restored and customers will be offered free game time as compensation for the outage, the company said.
Sony also said it had appointed an acting chief information officer to oversee security on its networks.
The attack on Sony is the highest-profile of a series that have affected large corporations in recent months, fuelling doubts about the security of cloud computing services.
"During the past 18 months, we've seen a dramatic rise in the volume of cyber attacks, their sophistication and their impact on businesses," Sony quoted Francis deSouza of Internet security company Symantec as saying.
Japanese games company Square Enix, known for the Final Fantasy series, said on Saturday that hackers had accessed one of its websites and obtained information, including up to 25,000 customer e-mail addresses and possibly job applicants' resumes.
Copyright@ Reuters..
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