Device Activity Tracker is a proof-of-concept security research tool that measures delivery-receipt round-trip times on WhatsApp and Signal to infer whether a target device is active, in standby or offline.
5198phone-number,signal,trackingDevice Activity Tracker is a proof-of-concept security research tool that measures delivery-receipt round-trip times on WhatsApp and Signal to infer whether a target device is active, in standby or offline.