BOSTON -- The man accused of pulling off the biggest credit card and ID theft in U.S. pleaded guilty Tuesday in U.S. District Court in Boston.

Albert Gonzalez, 28, and his two unnamed Russian partners, were charged with stealing information on 130 million credit and debit cards.

Federal investigators said Gonzalez hacked into the data systems of several retailers, including Hannafords and 7-Eleven.

Gonzalez already pleaded guilty in September to stealing credit cards from millions of TJX Cos. customers.

Under the terms of the agreement, Gonzalez, a former Secret Service informant, pleaded guilty to conspiracy to gain unauthorized access to computers and wire fraud.

Prosecutors have agreed to seek a sentence of 15-25 years in prison. Sentencing is set for March.

According to the plea agreement, between October 2006 and May 2008, Gonzalez and another man picked out targets from a list of Fortune 500 companies, then leased servers in Latvia, Ukraine and the Netherlands and used malware to launch attacks against the companies' networks and steal customers' data.

Several of the corporate victims was also found on a server controlled by Gonzalez. Gonzalez tested malware by running multiple anti-virus programs in an attempt to ascertain if the programs detected the malware.

According to information in the plea agreement, it was foreseeable to Gonzalez that his coconspirators would use malware to steal tens of millions of credit and debit card numbers, affecting more than 250 financial institutions.

"The Department of Justice will not allow computer hackers to rob consumers of their privacy and erode the public's confidence in the security of the marketplace," said Assistant Attorney General Lanny Breuer. "Criminals like Albert Gonzalez who operate in the shadows will be caught, exposed and held to account. Indeed, with timely reporting of data breaches and high-tech investigations, even the most sophisticated hacking rings can be uncovered and dismantled, as our prosecutors and agents demonstrated in this case."

Gonzalez’s lawyer recently filed a psychiatric evaluation with the court indicating that Gonzalez suffered from symptoms consistent with Asperger’s syndrome.