A hacker known as Reckz0r on Twitter announced that he has illegally accessed servers belonging to dozens of large banks. To prove it, the hacker released data relating to Visa and MasterCard credit cards. The data leaked includes full names, addresses, debit or credit card type, phone numbers and email addresses. Reckz0r claims this is only a portion of the data stolen, and the full amount is “about 50GB or bigger” taken from “over 79 large banks” that he has been targeting over the last three months. Global Payments, an international credit card processing company, confirmed in March that hackers stole credit card numbers belonging to as many as 1.5 million MasterCard and Visa customers. It is unclear if the data leaked by Reckz0r was involved with the earlier breach, however.