Hacking Time: Spoofing Atomic Clocks with Audio Harmonics
Summary
The article explains why WWVB time signals are hard to receive on the U.S. East Coast and how a mobile app can spoof an atomic clock by generating a clipped audio signal that creates a near-field magnetic effect. It details the hardware chain (phone speaker, voice coil, ferrite loop antenna) and provides a practical workflow to synchronize clocks, highlighting security implications for timekeeping devices.