MobiWear is a prototype which can be used to hide sensitive data in smartwatch (against coercive attackers), leveraging image steganography and plausibly deniable encryption. The prototype was implemented by modifiying the existing open-sourced code, and can only support LG G watch. The following demo videos show how the prototype works currently.
Embed secret data: The user provides both a public password and a secret password to hide ``HELLO'' into a cover image. The password is entered via gyroscop.
Extract secret data via both the decoy and the true key: The user uses both the public password and the secret password to extract the ``HELLO'' from the cover image; if only the public password is provided, only the watermark instead of ``HELLO'' will be extracted, which can defend against a coercive attack.

The current source code of MobiWear is avaiable here (Please be aware that the source code is intended solely for research and study purposes, and comes with no warranty) and the technical design document can be found here.

BibTeX:
@inproceedings{chen2021mobiwear,
title={MobiWear: a plausibly deniable encryption system for wearable mobile devices},
author={Chen, Niusen and Chen, Bo and Shi, Weisong},
booktitle={EAI International Conference on Applied Cryptography in Computer and Communications},
pages={138--154},
year={2021},
organization={Springer}
}