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The majority of available wearable devices require communication withInternet servers for data analysis and storage, and rely on a paired smartphoneto enable secure communication. However, wearable devices are mostly equippedwith WiFi network interfaces, enabling direct communication with the Internet.Secure communication protocols should then run on these wearables itself, yetit is not clear if they can be efficiently supported. In this paper, we showthat wearable devices are ready for direct and secure Internet communication bymeans of experiments with both controlled and Internet servers. We observe thatthe overall energy consumption and communication delay can be reduced withdirect Internet connection via WiFi from wearables compared to usingsmartphones as relays via Bluetooth. We also show that the additional HTTPScost caused by TLS handshake and encryption is closely related to number ofparallel connections, and has the same relative impact on wearables andsmartphones.

Are wearable devices ready for HTTPS? Measuring the cost of secure communication protocols on wearable devices