https://downey.io/notes/dev/curl-using-mutual-tls/ https://github.com/KumarShrawan/practical-pki https://stackoverflow.com/questions/34532392/client-certificate-authentication-in-ssl-handshake/34533228#34533228

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 1. https://android.googlesource.com/platform/hardware/interfaces/+/master/keymaster/4.0/IKeymasterDevice.hal 2. https://www.fatalerrors.org/a/android-q-10.1-keymaster-source-analysis-implementation-of-various-scenarios.html

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Spongy Castle is the stock Bouncy Castle libraries with a couple of small changes to make it work on Android.

Bouncy Castle (BC) is a set of easy-to-use cryptography APIs. It is a provider for the Java Cryptography Extension and