this post was submitted on 07 Apr 2026
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187
Signal messages retrieved from iOS notification, as seen in Prairieland federal trial (infosec.pub)
submitted 17 hours ago by frocalannifo@fedia.io to c/technology@lemmy.world
47 comments fedilink hide all child comments
 

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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[–] in_my_honest_opinion@piefed.social 32 points 16 hours ago (1 children)

Yup,

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

Among other things

[–] spectrums_coherence@piefed.social 10 points 13 hours ago (2 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.

[–] 0_o7@lemmy.dbzer0.com 1 points 27 minutes ago (1 children)

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

Source?

[–] in_my_honest_opinion@piefed.social 7 points 11 hours ago

The message preview notification is handled similarly in IOS and Android. The issue isn't people seeing the notification, it's that the content of the message being passed to the phone's launcher. Which is unencrypted.