Although focussed on the Secure Enclave, this may be of interest: <a href="https:&#x2F;&#x2F;www.mikeash.com&#x2F;pyblog&#x2F;friday-qa-2016-02-19-what-is-the-secure-enclave.html" rel="nofollow">https:&#x2F;&#x2F;www.mikeash.com&#x2F;pyblog&#x2F;friday-qa-2016-02-19-what-is-...</a>