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)

3 best points · 0 comments · 3 Hacker News posts · 5,213 GitHub stars · View on GitHub

Hacker News discussions

• Exploiting Silent Delivery Receipts to Monitor Users on Instant Messengers (3 points, 0 comments, by tcsenpai, 2025-12-31)
• Device Activity Tracker: WhatsApp Activity Tracker via RTT Analysis (1 points, 0 comments, by thunderbong, 2025-12-10)
• Exploiting Silent Delivery Receipts to Monitor Users on WhatsApp/Signal (1 points, 0 comments, by krick, 2025-12-29)