What is iCloud Keychain?
iCloud Keychain keeps your Safari website usernames and passwords, credit card information, and Wi-Fi network information up to date across all of your approved devices that are using iOS 7.0.3 or later or OS X Mavericks 10.9 or later.
iCloud Keychain can also keep the accounts you use in Mail, Contacts, Calendar, and Messages up to date across all of your Mac computers. And when you sign in to Facebook, Twitter, LinkedIn, and your other Internet accounts, iCloud automatically adds your usernames and passwords to all of your devices.
How does iCloud Keychain protect my information?
iCloud Keychain keeps the passwords and credit card information that you save up to date only on the devices that you approve. When you turn on iCloud Keychain on an additional device, your other devices that use iCloud Keychain receive a notification requesting approval for the additional device. After you approve the additional device, your iCloud Keychain automatically begins updating on that device.
iCloud Keychain is protected with industry-standard encryption techniques on all of your devices, both in transit and in the cloud.
If you use two-factor authentication, your device is trusted when you sign in. You won’t need to approve your device separately to turn on iCloud Keychain.