The out-of-band device SHOULD be uniquely addressable and communication over the secondary channel SHALL be encrypted unless sent via the public switched telephone network (PSTN). For additional authenticator requirements specific to the PSTN, see Section 5.1.3.3. Methods that do not prove possession of a specific device, such as voice-over-IP (VOIP) or email, SHALL NOT be used for out-of-band authentication.
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The topography of the area where sensors are deployed, the networks and objects nearby, and the weather are some environment constraints that might have a negative impact on the radio link properties. In this work, we evaluated the impact of the topography of the environment by comparing the radio link properties considering a flat and a hill area. On the hill area, we did not measure the slope of the area. Nevertheless, Figure 13 shows a very poor radio link properties on the hill. Moreover, the results presented in Section 5.1.3 show that, in the same network, the link properties also depend on the location of the sensor. Thus, to guarantee a reliable communication, during the sensors deployment or during communication protocols design, the environment characteristics must be taken into account. 2ff7e9595c
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