EchoGuard: Continuous Ultrasound-based Human Presence Verification Against AI Agents

Yizhu Wen, Dharani Nadendla, Shirui Cao, Renzhi Hao, Dong Li, Hanqing Guo
The 9th ACM/IEEE Workshop on Security and Privacy in Edge Computing (EdgeSP’26)

Continuously verifies that a real human — not an automated AI agent — is present at a device, using ultrasound sensing.