slashcrypto

They said, that they are looking into it ...

Would be very interesting to know what SFFE means ;)

I edited this part, you are definitely right.

I edited the article because I really missed this point, you are right. I thought WhatsApp is not sending the message which got encrypted with the new key. But still, I would not say this is a backdoor, because the user has a relatively easy way to check the keys. If WhatsApp would like to implement a backdoor, they would have done it in a different way I think.