Two questions.
My family insist on using Whatsapp for the family chats. I have to keep a copy on a device just so I can communicate with them. I do so under protest, as I was always told it isn't secure. My brother has just said
"oh Whatsapp is encrypted, it's perfectly secure".
First, is it actually as encrypted and safe as my brother claims? That would solve everything.
Second, if it isn't, where can I get some proof that we should switch to Telegram or whatever? Proof which doesn't make me look like a raving loony?
No, the protocol is sound enough, WhatsApp doesn’t have the key, doesn’t want the key (so they will probably not be responsible for what you are communicating with others), and doesn’t need the key - as others have put so eloquently, the metadata is rich enough for them.