Are my messages secure?
WhatsApp communication between your phone and our server is fully encrypted.
We do not store your chat history on our servers. Once delivered successfully to your phone, chat messages are removed from our system.
Even though data sent through our app is encrypted, remember that if your phone or your friend's phone is being used by someone else, it may be possible for them to read your WhatsApp messages. Please be aware of who has physical access to your phone.
WhatsApp Support Team