Back in June, Apple rolled out a two-factor authentication system for the iCloud.com suite of web apps. The feature quickly disappeared, but today, users are noticing that it has returned. The feature requires users to verify their identity via a ping to a SMS text number or device connected to their particular iCloud login ID. This adds an extra layer of protection so that if even another person knows your iCloud password, they will still need one of your iOS devices or SMS-connected cell phones to access Mail, Contacts, Calendar, Notes, Reminders, and iWork on the web. The addition of two-factor verification comes following Apple CEO Tim Cook’s promise to bolster iCloud security after a small number of celebrity accounts were accessed by hackers.