Six technical questions on low-frequency wake-up signals versus ultra-high-frequency responses, dual-transceiver signal amplification mechanics, AES-128 challenge-response relay vulnerability, IEEE 802.15.4z UWB time-of-flight distance bounding, picosecond timing constraints, and Faraday shielding.
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In a standard Passive Keyless Entry and Start (PKES) system, why do vehicles use low-frequency (LF 125 kHz) signals for key discovery and ultra-high-frequency (UHF 315/433/868 MHz) signals for key responses?