https://static.linaro.org/connect/yvr18/presentations/yvr18-414.pdf
https://code.tutsplus.com/tutorials/keys-credentials-and-storage-on-android–cms-30827
https://www.apriorit.com/dev-blog/432-using-androidkeystore
http://bits-please.blogspot.com/2016/06/extracting-qualcomms-keymaster-keys.html
https://www.usenix.org/conference/woot20/presentation/busch
https://security.googleblog.com/2018/
https://ostoday.org/android/is-android-keystore-secure.html
https://labs.f-secure.com/blog/how-secure-is-your-android-keystore-authentication/
https://medium.com/@josiassena/using-the-android-keystore-system-to-store-sensitive-information-3a56175a454b
Source walkthrough