How to make it say 'imessage' on the lock screen?

I have an iphone5. When people text me, on the lock screen it shows the actual text. Instead of their text being there i want it to say 'iMessage' and i've seen peoples phones do that, how do i make it like that? My parents are nosy and think they can check what people are texting me…

Maybe with a jailbreak and knowledge of iOS

Go to Notification Center, and go to Messages, and turn off Show Preview

Thank you this actually worked!

This is not what you want

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