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IEEE/ICACT20260106 Slide.12        [Big Slide]	Oral Presentation
	POSAUTH (Point-of-Sale (POS) authentication) Protocol uses ephemeral keys and mutual authentication to protect against relay and replay attacks. Its theoretical strength is high, though real-world deployment evidence is limited. Trusted Tapping Protocol (TTP) uses tap patterns, proximity cues, and environmental sensing to verify intent, showing strong empirical resistance to relay attacks without imposing significant transaction delays.

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