With the growth of wearable devices, which are usually constrained in
computational power and user interface, this pairing has to be autonomous.
Considering devices that do not have prior information about each other, a
secure communication should be established by generating a shared secret key
derived from a common context between the devices. Context-based pairing
solutions increase the usability of wearable device pairing by eliminating any
human involvement in the pairing process. This is possible by utilizing onboard
sensors (with the same sensing modalities) to capture a common physical context
(e.g., body motion, gait, heartbeat, respiration, and EMG signal). A wide range
of approaches has been proposed to address autonomous pairing in wearable
devices. This paper surveys context-based pairing in wearable devices by
focusing on the signals and sensors exploited. We review the steps needed for
generating a common key and provide a survey of existing techniques utilized in
each step.

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