<P> Google also offers a 2 - step verification option--for additional security against hacking--that requests a validation code each time the user logs into their Google account . The code is either generated by an application ("Google Authenticator" or other similar apps) or received from Google as an SMS text message, a voice message, or an email to another account . Trusted devices can be "marked" to skip this 2 - step log - on authentication . When this feature is switched on, software that cannot provide the validation code (e.g. IMAP and POP3 clients) must use a unique 16 - character alphanumeric password generated by Google instead of the user's normal password . </P> <P> 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 compromise an account, a notice will be displayed that reads "Warning: We believe state - sponsored attackers may be trying to compromise your account or computer ." </P> <P> Google may block an account for various reasons, such as "unusual activity" or entering an age "not old enough" to own a Google account . Reactivation is possible using web - forms, providing proof of identity through valid photo ID, or a credit card payment of US $0.30 . Other methods (such as sending a fax or uploading some requested document) require human interaction and may take some "days or a couple of weeks" to be accomplished . </P> <P> A provider of an authenticated web applications can delegate the authentication function to Google . When a user tries to gain access to a secure resource on the third party website they are redirected to the Google Accounts login page . Here they will see an explanation of why they need to log in with their Google credentials . Any data which is to be shared with the third party will also be listed on this screen . Once authentication has succeeded the user is redirected back to the referring site along with a token identifying them as having logged in via Google . </P>

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