• 4am@lemmy.zip
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    11 days ago

    Notifications go through FireBase Cloud Messaging (FCM) on Android. They bounce off a Google server. Even from local, on-device apps.

    Same with iOS.

    They can read and store every one of them, and you don’t control the encryption keys.

    • Björn@swg-empire.de
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      11 days ago

      But they only instruct Signal to wake up and download whatever is waiting. They don’t contain the message contents.