WhatsApp already encrypts conversations and does all it can to ensure your data stays private. The new two-step verification feature will make it harder for other people to access your account.
Two-step verification adds an extra step when you log in to WhatsApp. First the service will send you a random passcode when you sign in, then you'll need to enter a six-digit passcode.
Users will have to enter a six-digit passcode every time they register their phone number with WhatsApp again. So, for example, if you get a new phone but keep the same SIM card and number.
WhatsApp’s implementation isn’t like two-factor authentication with Google or Facebook, which generates a code with an app or sends one via text. You’ll have to remember your WhatsApp passcode, or you can set up a backup email, which will allow you to disable two-factor on your account if you ever forget your six-digit passcode. You can also disable two-factor from within the app, without a passcode.
To turn on two-step verification, open the app and then go to Settings > Account > Two-Step Verification.
Select Enable, then enter a six-digit code when prompted. You'll also need to enter an email address for WhatsApp to use should you forget your passcode.
If you choose not to enter an email address and forget your passcode, WhatsApp will lock you out of your account for seven days. After those seven days, WhatsApp will let you reauthorize your number without the passcode, but any messages sent to you during those seven days will remain undelivered.
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