An unnamed sources with direct knowledge of the investigation now says that the “cyberattack on Google in January included “unified Single Sign-On” — the system that controls access by millions of users worldwide to almost all of the company’s Web services, including e-mail and business applications. The program, code named Gaia for the Greek goddess of the earth, was attacked in a lightning raid taking less than two days last December, the person said. Described publicly only once at a technical conference four years ago, the software is intended to enable users and employees to sign in with their password just once to operate a range of services. Hours after announcing the intrusions, Google said it would activate a new layer of encryption for Gmail service. The company also tightened the security of its data centers and further secured the communications links between its services and the computers of its users. Several technical experts said that because Google had quickly learned of the theft of the software, it was unclear what the consequences of the theft had been. One of the most alarming possibilities is that the attackers might have intended to insert a Trojan horse — a secret back door — into the Gaia program and install it in dozens of Google’s global data centers to establish clandestine entry points,” reports NYT.