Ivan Krstić, Head of Apple Security Engineering and Architecture at Apple, will be speaking at BlackHat on the T2 security processor:
[…]We will discuss three iOS and Mac security topics in unprecedented technical detail, offering the first public discussion of several key technologies new to iOS 13 and the Mac.[…]The T2 Security Chip brought powerful secure boot capabilities to the Mac. Comprehensively securing the boot process required protections against sophisticated direct memory access (DMA) attacks at every point, even in the presence of arbitrary Option ROM firmware. We will walk through the boot sequence of a Mac with the T2 Security Chip and explain key attacks and defenses at each step, including two industry-first firmware security technologies that have not been publicly discussed before.[…]
https://www.blackhat.com/us-19/briefings/schedule/#behind-the-scenes-of-ios-and-mac-security-17220
Firmware Security 