With “Secret Lock” you can protect your phone from access to the lock screen. Basically, you have to use a specific gesture to access to the lock screen to unlock your iphone or ipad. With this tweak you’ll add more protection to your iOS 8 device.
But the lock screen is not secure? Yes, sure iOS devices lock screen is secure. This is an extra security tip for those who, for example, share their PIN code in many devices or that for some reason shared PIN with others and want to keep their devices secure without changing PIN code.