Quick reply messaging from your Lock screen may be convenient, but it isn't secure.
With interactive notifications you can swipe left across any iMessage on the Lock screen and quickly send off a reply, no passcode, password, or Touch ID required. That's great if you're always in a rush and just need to answer everything and anything as fast as possible. It's not so great if you often leave your iPhone or iPad unattended, where other people can potentially reply to your messages either as a prank or maliciously. Interactive notifications are enabled by default, but if you'd rather have security than convenience, you can easily turn them off.
Full story from the iMore Blog...
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