The apple security whitepaper is actually a decent place to start https://www.apple.com/business/docs/site/iOS_Security_Guide.pdf https://www.apple.com/business

The apple security whitepaper is actually a decent place to start https://www.apple.com/business/docs/site/iOS_Security_Guide.pdf https://www.apple.com/business/docs/site/iOS_Security_Guide.... There is also a blackhat talk from Ivan Krstic (one of the top security people at apple) where he goes surprisingly deep https://www.youtube.com/watch?v=BLGFriOKz6U https://www.youtube.com/watch?v=BLGFriOKz6U