Google has published a Infrastucture Security Design Overview that explains how it secures the cloud it uses for its own operations and for public cloud services.Revealed last Friday, the document outlines six layers of security and reveals some interesting factoids about the Alphabet subsidiary's operations, none more so than the revelation that “we also design custom chips, including a hardware security chip that is currently being deployed on both servers and peripherals. These chips allow us to securely identify and authenticate legitimate Google devices at the hardware level.”