FBI Pulls Deleted Signal Messages from iPhone Notification Database
What Happened
FBI agents extracted encrypted-app message content from iPhone notification cache files, retrieving messages users believed were deleted. The technique relies on iOS retaining notification payloads beyond user expectations. Signal and Apple are reportedly reviewing default behaviors.
My Take
Every executive using Signal for sensitive conversations just learned their threat model is wrong. The lesson generalizes: privacy is a system property, not an app property. Companies relying on encrypted messaging for board comms or M&A discussions need device-level retention policies, not app-level ones. Expect a flurry of mobile-device-management vendors to ship "notification cache wipe" features within the quarter, and expect Apple to quietly change the default in iOS 19.
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