The data in the keychain item can be accessed only while the device is unlocked by the user.
- iOS 4.0+
- macOS 10.9+
- tvOS 9.0+
- watchOS 2.0+
This is recommended for items that need to be accessible only while the application is in the foreground. Items with this attribute migrate to a new device when using encrypted backups.
This is the default value for keychain items added without explicitly setting an accessibility constant.