Facebook’s WhatsApp has dismissed a charge that its application contains a backdoor that could be used to unlock encrypted messages. Security experts say any attempt to target the potential vulnerability would require a relatively far-fetched attack. WhatsApp implemented end-to-end encryption in its instant messaging application in April 2016. A so-called man-in-the-middle attack occurs when a hacker manages to trick a sender into using his public key instead of that of the recipient. WhatsApp does have a security setting that will stop messages from being transmitted if a recipient’s public key has changed.”]
Source: https://www.inforisktoday.com/blogs/whatsapp-refutes-claim-backdoor-p-2363