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Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download iOS Keychain Plugin Free.
iOS Keychain Plugin v1.3.4
Access the iOS Keychain through Unity and store data that can be automatically synced across devices and persist between installations.
Common uses include:
▪ Game save file
▪ Preferences
▪ Passwords
▪ Unique Identifier to consistently identify a user, even after they uninstall/reinstall the application or switch to a new device.
▪ Compatible with tvOS All other platforms are compatible and encrypt data and save it locally. Users will not be able to edit this data!
Requires iOS 7+ and iCloud Keychain to be enabled for syncing to work
Documentation Page