Got it from here : https://infosec.exchange/@mattburgess/111885761552024420
NEW: WhatsApp will soon make it possible to chat with people who use other messaging apps. It’s revealed some more details on how that will work.
— Apps will need to sign an agreement with Meta, then connect to its servers.
— Meta wants people to use the Signal Protocol, but also says other encryption protocols can be used if they can meet WhatsApp’s standards
— WhatsApp has been testing with Matrix in recent months, although nothing is agreed yet. Swiss app Threema says it won’t become interoperable
WhatsApp will allow any service to communicate with their network. But wether or not any do is entirely up to those other apps. I think there’s very little chance Signal will ever interoperate with anything for example. iMessage surely won’t either.
Technically it shouldn’t be difficult, because almost every chat app these days uses the same protocol (Signal which is an unofficial industry standard and soon to be an official one). The question is how well it fits with their business model. And most companies don’t share their business model.
The other issue is the recipient needs to opt in. You won’t be able to send messages to just anyone… and if spam is an issue then everyone might turn it off.
The bigger question for me is wether or not you will be able to use a third party app to access WhatsApp. As in full access, view all messages, view contacts, create messages, receive push notifications, etc etc. It looks like the DMA might allow a return to software like Adium which is an open source messaging app that used to be able to log into almost any messaging service. These days none of the most popular services are available in the app, so almost nobody uses it.
Adium… They named an app ‘the element of advertisement’?
Adium… now that’s a name I have not heard for a while. Used to have a super nice customized version to chat with friends on various platforms. It was amazing. Thanks for the nostalgia trip!