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"Hands-free" kits with ear pieces can be used with cell phones for convenience and comfort. In addition, because the phone, which is the source of the RF emissions, will not be placed against the head, absorption of RF energy in the head will be reduced. Therefore, it is true that use of an ear piece connected to a mobile phone will significantly reduce the rate of energy absorption (or "SAR") in the user's head. On the other hand, if the phone is mounted against the waist or other part of the body during use, then that part of the body will absorb RF energy. Even so, mobile phones marketed in the U.S. are required to meet safety limit requirements regardless of whether they are used against the head or against the body. So either configuration should result in compliance with the safety limit. Note that hands-free devices using Bluetooth technology also include a wireless transmitter; however, the Bluetooth transmitter operates at a much lower power than the cell phone.
Enabling users to push the physical world's limits, AR/VR opened a new chapter in perception. Novel immersive experiences resulted in novel interaction methods, which came with unprecedented security and privacy risks. This paper presents a keylogging attack to infer inputs typed with in-air tapping keyboards. We exploit the observation that hands follow specific patterns when typing in-air and build a 5-stage pipeline. Through various experiments, we showed that our attack achieves 40% - 89% accuracy. Finally, we discuss countermeasures, while the results presented provide a cautionary tale of the security and privacy risk of the immersive mobile technology. 2b1af7f3a8