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On the web, there is a web push protocol. And a number of extensions which help out.

One of the extensions is Message Encryption, which effectively keeps the message secure during transit at least (but could be more!). Quite important really because most browsers are configured to use push services provided by the browser maker, which are public & high availability. Browsers then ask the push service for their messages.

https://datatracker.ietf.org/doc/html/rfc8291

I rather doubt Signal would have worked with PushBullet but now that it's no longer an SMS client too it's less interesting to think about.



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