Two-Step Authentication for iCloud

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Two Step verification

Apple introduced new security features to iCloud, including Two-Step Authentication and App-specific passwords. App-Specific passwords are generated per app and and can be used instead of your Apple-ID credentials. This guide will help you to set them up for our apps. (see also:

Important: Starting on October 1, 2014, app-specific passwords will be mandatory to login at iCloud using third party apps. For reference, have a look at this official page:

Update: Apparently Apple is finally going to enforce this as of June 15, 2017

Enable the app-specific password

Note: The following instructions are only necessary if you have Two-Step Authentication enabled for your account.

Log in using your Apple ID credentials.
The site will sent an verification code to one of your Apple devices.
Enter the code that's been sent to the device.
Open "Password and Security" and select "Generate an App-Specific Password"
Choose a label that will help you identify the password, e.g. "SmoothSync" and select "Generate". Note: You don't necessarily need passwords for each app. You can use one password for all.
Click "Done".
Use this password to login with SmoothSync.

Revoke an app specific password

Note: The following is quoted from the site mentioned above

You can have up to 25 active app-specific passwords at any given time. If you need to, you can revoke passwords individually or all at once.

To revoke app-specific passwords:

   Go to My Apple ID.
   Select Manage your Apple ID and sign in.
   Select Password and Security.
   Select View History.
   Select Revoke next to a password, or select Revoke All.

After you revoke a password, the app using that password will be signed out of iCloud until you generate a new password and sign in again.

Any time you change or reset your primary Apple ID password, all of your app-specific passwords will be revoked automatically to protect the security of your account. You'll need to generate new app-specific passwords for any third party apps you would like to continue using with iCloud.