Serv2Share

Users who seek an even higher level of security protection, including users whose accounts could be attractive targets for hackers, such as celebrities, politicians, journalists, political activists and wealthy individuals, can opt-in to Google's Advanced Protection Program. This program requires the user to purchase two U2F USB keys — not for data storage, but for identity verification. The U2F keys are used to provide two-step verification during login. One is for backup purposes, in case the first is lost. The Advanced Protection Program includes further security measures to protect the user's account, such as restrictions on which applications the user can grant access to their account, and a more thorough identity verification process for regaining access to the account if the password is forgotten.[11]

On June 5, 2012, a new security feature was introduced to protect users from state-sponsored attacks. Whenever Google analysis indicate that a government has attempted to comp