GitHub - gommzystudio/device-activity-tracker: A phone number can reveal whether a device is active, in standby or offline (and more). This PoC demonstrates how delivery receipts + RTT timing leak sensitive device-activity patterns. (WhatsApp / Signal)
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A phone number can reveal whether a device is active, in standby or offline (and more). This PoC demonstrates how delivery receipts + RTT timing leak sensitive device-activity patterns. (WhatsApp /...

Author Thread- Follow Up

A phone number can reveal whether a device is active, in standby or offline (and more). This PoC demonstrates how delivery receipts + RTT timing leak sensitive device-activity patterns. (WhatsApp / Signal)

What it does: By measuring Round-Trip Time (RTT) of WhatsApp message delivery receipts, this tool can detect:

  • When a user is actively using their device (low RTT)
  • When the device is in standby/idle mode (higher RTT)
  • Potential location changes (mobile data vs. WiFi)
  • Activity patterns over time
  • onlinepersona@programming.devEnglish
    2·
    17 hours ago

    Nice. It would make sense that not only WhatsApp and Signal are susceptible to this but any service where the person knows your identifier.