WhatsApp will fully encrypt messages by default, signaling a leap forward for the privacy of everyday chatter around the world.

The rollout, announced today, was described by the app maker as the "largest deployment of end-to-end encryption ever.” The feature will, it's hoped, safeguard messages from eavesdroppers by encrypting chats between people.

There are limits to Facebook-owned WhatsApp's end-to-end encryption. So far, it only covers text messaging (as opposed to group messages or pictures), it only works on Android, and it remains open to potential man-in-the-middle attacks because there's no way to verify the identity of the person you're messaging.

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