A group of hackers called Green Dragon Crew announced on Twitter that the recent cyber-attack on the Privatbank, the largest commercial bank in Ukraine was their doing. The attack appears to be a distributed denial-of-service since on June 30, for a few hours, the bank’s pages either would not load or offered sporadic access to the customers. However, the group also claims that they managed to breach the bank’s systems and that they have access to customer bank accounts. In order to do this, they would have to access different systems because payment service and the website are not part...