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WhatsApp chats come with end-to-end encryption. End-to-end encryption means that only you and the person with whom you're conversing can read or listen to what's sent. Even WhatsApp claims that it cant read those chats. Communications locked with end-to-end encryption ensure that only the recipient and sender have the specific key to unlock and read them. All of this happens automatically, so you don't have to do anything to protect your messages.

End-to-end encrypted conversations have their own security code that is used to ensure that the calls and messages sent are encrypted all the way through. This code appears as a QR code and a 60-digit number on the contact information screen. These codes are unique to each chat and maybe compared between users in the chat to ensure that the messages sent are encrypted end-to-end. Security codes are only visible representations of the special keys which the sender and receiver share, the true keys are always kept private.

Open WhatsApp go to the right corner three option button

Go to Settings

Select the Chats option

Select Chat backup

Tap on End-to-end encrypted backup

Turn on End-to-end encrypted backup

Create Password/Use 64 digit encryption key for End-to-end encrypted backup

Create an End-to-end encrypted backup

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How to enable security feature in WhatsApp - Gadgets Now