Ivan Krstić did an amazing presentation at the 2016 Black Hat in Vegas, which I’ve thrown here: us-16-Krstic. Great content around iOS Security, under the hood. Encryption, webkit hardening, secure enclave processing, key bags, master keys, data at rest security, updates, data protection, synchronization security, keychains, iCloud, backup, key vaults, aaaaannnnnnnddddddd Bounties for uncovering vulnerabilities! Great stuff!