Well, Co-founder of Makerdiary is here :)
I love this article, and I wanna promote our works in this thread :)
We are build some little Nordic nRF52-based widgets for maker with a lot of documents, you can find more wiki at here[1][2]. And we are try to use MESH network technology to protect our IoT data, here is some tutorial for BLE MESH[3] and OpenThread MESH[4].
BTW, if you are intersted in FIDO U2F security key, please check here[5], an open source FIDO U2F implementation on nRF52 SoC.
[1]: https://wiki.makerdiary.com
[2]: https://blog.makerdiary.com
[3]: https://blog.makerdiary.com/getting-started-with-bluetooth-m...
[4]: https://blog.makerdiary.com/build-a-thread-network-with-nrf5...