The outfit said that credit card details stored on the server were encrypted and therefore impossible for the hackers to steal.
However other details, such as names and addresses could have been stolen, herefore making ID theft possible.
The statement comes after PS3 network users started to complain that their credit cards were being used for transactions they never made.
Sony has also been sued by a user who claims that it should not have waited a week before warning him that his details may have been taken.
But Sony said that if credit card details were being used in rogue transactions it had nothing to do with the PS3 network hack.
“All of the data was protected, and access was restricted both physically and through the perimeter and security of the network,” Sony wrote in its bog .
“The entire credit card table was encrypted and we have no evidence that credit card data was taken. The personal data table, which is a separate data set, was not encrypted, but was, of course, behind a very sophisticated security system that was breached in a malicious attack.”
So far there have been about 24 reported cases of fraudulent charges on cards used on the PlayStation Network. However, since more than 77 million people are believed to have had their data stolen it is statistically likely that a few hundred would be victims of credit card fraud in any given week.