Google now has extended its Android-based two-factor authentication to Google applications on iOS devices like iPads and iPhones. The authentication app uses a certificate built into Android that responds to a challenge issued by a specific, enterprise-enabled website. Google’s authentication is based on FIDO (Fast ID Online) security keys, which leverage public-key cryptography to verify both the user and the login page URL. To authenticate from a desktop, the user must launch a Chrome browser window to begin the login process.”]
Source: https://www.darkreading.com/cloud/google-adds-two-factor-authentication-for-its-apps-on-ios