A spate of breaches is making Sony’s Web security measures seem like a make-believe world. The security walls of yet another Sony network, SonyPictures.com, have been breached by a hacking group which calls itself LulzSec.

Hackers from LulzSec claim that they have broken into SonyPictures.com and stole email addresses and passwords of over a million users. The attacks were apparently meant to teach Sony a lesson.

LulzSec has claimed responsibility for the last week’s hack of the Public Broadcasting Service (PBS) website. The group said that they used a "simple" attack on a "primitive" security hole to gain control of Sony Pictures database.

To prove their action, the group also posted the stolen information online where they are publicly accessible.

Lulz Security said, "We recently broke into SonyPictures.com and compromised over 1,000,000 users’ personal information, including passwords, email addresses, home addresses, dates of birth, and all Sony opt-in data associated with their accounts."

"Due to a lack of resources on our part we were unable to fully copy all of this information," the group said.

"In theory we could have taken every last bit of information, but it would have taken several more weeks."

The group said that Sony was negligent with its data and stored it in unencrypted for.

"Why do you put such faith in a company that allows itself to become open to these simple attacks?" Lulz Security said.

"What’s worse is that every bit of data we took wasn’t encrypted. Sony stored over 1,000,000 passwords of its customers in plaintext, which means it’s just a matter of taking it," the group said.

"This is disgraceful and insecure: they were asking for it."

Sony Pictures has said that it is aware of the claims and is investigating the matter.

Sony Pictures Entertainment executive vice president Jim Kennedy told AFP, "We are looking into these claims."

Meanwhile Sony has restored its PlayStation Network (PSN) in Europe and many other parts of the world.

The network was shut down on 19 April after Sony discovered a massive security breach which is believed to have compromised over 100 million accounts worldwide.

Other Sony websites have also faced cyber attacks in the last few months.