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Signal messages retrieved from iOS notification, as seen in Prairieland federal trial (europe.pub)
submitted 6 months ago by to c/technology@lemmy.world
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TLDR: signal content in Apple notification can be retrieved even after signal app deletion.

I saw from this reddit thread: Signal messages retrieved from iPhone after uninstalling app. : signal

Referencing this news article: Pretti Killing May Affect ICE Prairieland "Antifa Cell" Terrorism Trial

The mention of signal is in court documents here: March 10: Federal Trial Day 12 - Support the Prairieland Defendants

Signal chat evidence from Sharp’s device (Exhibit 158):
Messages were recovered from Sharp’s phone through Apple’s internal notification storage — Signal had been removed, but incoming notifications were preserved in internal memory. Only incoming messages were captured (no outgoing).

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[–] 34 points 6 months ago (5 children)

Yup,

https://www.privacyguides.org/articles/2022/07/07/signal-configuration-and-hardening/

Among other things

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  • [–] 14 points 6 months ago (4 children)

    I think on android, signal do not use Google's push notification. They simple send a dummy push, and the signal app wakes up to retrive the latest message directly from signal server.

    So Google never have your notification content. I am not sure if they do the same on iOS.

    That being said if your attack model includes people reading your notification lock screen, then you should disable showing signal notification.

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  • [–] 1 point 6 months ago (2 children)

    I think on android, signal do not use Google's push notification.

    Source?

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