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WhatsApp is starting to roll out an optional two-step verification for its chat app, the company announced today.

A two-step verification beta started last November.

“When you have two-step verification enabled, any attempt to verify your phone number on WhatsApp must be accompanied by the six-digit passcode that you created using this feature,” a company spokesperson told VentureBeat in an email.

WhatsApp is known for its end-to-end encryption from Open Whisper Systems, but has been slow to add two-step verification, a security measure that has become commonplace for services like LinkedIn, Amazon, and Google.

Last month, WhatsApp parent company Facebook brought two-step authentication to Facebook pages. Instagram added two-factor authentication in February 2016.

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