The Find My feature in iOS 13 and macOS Catalina enables users to receive help from other nearby Apple devices in finding their lost Macs, while rigorously protecting the privacy of all participants. We will discuss our efficient elliptic curve key diversification system that derives short nonlinkable public keys from a user’s keypair, and allows users to find their offline devices without divulging sensitive information to Apple.

By Ivan Krstić

Full Abstract & Presentation Materials: https://www.blackhat.com/us19/briefi...