Sega said in a press released today that 1,290,755 Sega Pass users' details were stolen in Friday's website hack, including names, email addresses, dates of birth and encrypted passwords.
Following confirmation on Friday that Sega's Sega Pass website had been hacked and user data compromised, the publisher said this morning that "1,290,755 customers’ information including Sega Pass members name, email addresses, dates of birth and encrypted passwords were obtained."
No financial data was stored on the site.
The firm added: "We express our sincerest apologies to our customers for the inconvenience and concern caused by this matter. Sega Pass is the service used to provide information about our new products to registered members and does not hold any customer financial information.
"After the unauthorized entry was identified, we immediately stopped the SEGA Pass service and took emergency action to prevent further damage. This action included immediately contacting all our registered SEGA Pass users. We are now fully investigating the cause of the incident."
Sega said it will "immediately report through the website of Sega Europe should there be any further developments regarding this issue."
The company will "strengthen network security as a priority issue" as a result of the hack.
The incident is merely the latest in a string of network attacks against games companies in 2011, the full extent of which is catalogued here.