Apple Just Confirmed Governments Are Spying on Phones with Push Notifications

The solution isn't just encrypt the payload. Frankly cryptographic guarantees are the problem. It would require something like Signal's Sealed Sender feature, but more. The govt is getting data like "Signal sent user1 a notification." You just can't hide that metadata when you have to cryptographically attest every message you push to apns. If the message has the username or group name that's well and good but is ancillary.