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by lxgr
362 days ago
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Definitely, but they don't have to contain any (plaintext) message content for encrypted messengers. On Android, push notifications were always processed by the receiving app, so it can just decrypt a payload directly (or download new messages from the server and decrypt these); on iOS, this isn't as reliable (e.g. swiping the app out of the app switcher used to break it in several iOS versions), but "VoIP notifications" and the newer "message decryption extension" [1] are. The same principle applies to Web Push – I believe end-to-end encryption is even mandatory there. [1] https://developer.apple.com/documentation/usernotifications/... |
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