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Phone Push Notifications: A Double-Edged Sword for User Privacy and Law Enforcement
(www.theregister.com)
This is a most excellent place for technology news and articles.
Unrelated but does android support that thing where notifications can be encrypted and decryined on device, IE getting a message from signal and having it decrypted in device so you get the actual message and not just "new message" in the notification box
Signal doesn't encrypt notifications from what I understand. It uses Google/Apples notification system like everything else. But the notification only says "Hey, wake up!". Then the Signal app goes and retrieves the message from Signal's servers. That retrieval will be encrypted, but it's outside the push notification system at the point.