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Device Activity Tracker is an open-source proof-of-concept that shows how you can infer a phone’s activity state via WhatsApp & Signal — using only timing information from “ghost” reactions.
Device Activity TrackerHow (almost) any phone number can be tracked via WhatsApp
gommzystarted a discussion
How (almost) any phone number can be tracked via WhatsApp / Signal
I’ve been playing with the “Careless Whisper” side-channel idea and hacked together a small PoC that shows how you can track a phone’s device activity state (screen on/off, offline) via WhatsApp – without any notifications or visible messages on the victim’s side. How it works (very roughly): uses WhatsApp via an unofficial API sends tiny “probe” reactions to special/invalid message IDs...
gommzyleft a comment
It’s based on the “Careless Whisper” side-channel idea: by sending tiny, invalid reactions to special message IDs and measuring the round-trip time (RTT) of the silent delivery receipts, you can infer patterns like: • low RTT ≈ screen on / active (often on Wi-Fi) • medium RTT ≈ active on mobile data • high RTT ≈ screen off / standby • timeouts / repeated failures ≈ offline (airplane mode / no...
Device Activity TrackerHow (almost) any phone number can be tracked via WhatsApp