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Meta explains how WhatsApp’s encrypted chats will work with third-party services
Third-party chats might take a while to start working.
The DMA requires that Meta “must be ready to enable interoperability with other services within three months of receiving a request,” but according to the blog post, actually turning it on for public use could take longer than that. Meta says third-party providers will have to sign an agreement to interoperate with Messenger and WhatsApp before the company will work with them to implement it. The company asks that other providers use WhatsApp’s Signal protocol for encryption but says it will accept others if it finds they meet the same security standards.
Or read this on The Verge