I have upgraded my devices to iOS 8. All seemed well. However, today I noticed I was mising some password in Safari. Checking my iCloud settings, I noticed that keychain was turned off. This must have happened during the update. Trying to enable it, I had to authorize via a second device. No problem I thought. But no, my iPad also had the same problem.
So now iCloud wants my security code, which I had set more than ayear ago, and cannot remember. What now?
IOS – How to get iCloud keychain back after update to iOS 8
icloudioskeychain
Related Solutions
As one can see you have the "Remember Networks this computer has joined" Enabled.
When you join new network, that information is saved in the
com.apple.airport.preferences.plist
located in SystemConfiguration folder.
Obviously iCloud gets that file.
EDIT
Since you asked a new question and want to know how iCloud does that read this. (and click on User defaults database to expand)
Designing for Key-Value Data in iCloud
To store discrete values in iCloud for app preferences, app configuration, or app state, use iCloud key-value storage. Key-value storage is similar to the local user defaults database; but values that you place in key-value storage are available to every instance of your app on all of a user’s various devices. If one instance of your app changes a value, the other instances see that change and can use it to update their configuration.
and
Signing in in my iPhone and enable iCloud Keychain did the trick to me. So I restored the keychain in my iPhone and then the keychain switch in my Mac changed to off state as magic
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Best Answer
If you have a verified phone number and have set up the ability to verify devices using SMS verification code, you can use this method. Otherwise, you will not be able to recover your keychain yourself. You may find help by contacting Apple: http://www.apple.com/support/icloud/contact/