Hacker News — 2026-05-16#
Top Story#
I broke AppLovin’s mediation cipher protocol A masterclass in reverse engineering where the author decrypted AppLovin’s ad-mediation traffic and proved that the network deterministically fingerprints iPhones regardless of Apple’s App Tracking Transparency (ATT) settings. By cracking a weak, unauthenticated SplitMix64 cipher, they revealed a payload of 50 device fields—including boot time, system volume, and free memory—being broadcast to dozens of ad networks, proving that the privacy controls iOS users rely on are functionally theater.