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How Apple’s Personal Knowledge Graph learns about your life on Mac
Apple’s macOS 13 introduced a Personal Knowledge Graph (PKG) that aggregates data from messages, emails, photos and other device content to give Siri contextual awareness. Security researchers at Eighth Rank dissected the PKG, revealing two background daemons—named knowledgeconstructiond—that populate 51 SQLite databases in the Library/IntelligencePlatform folder, including a central graph.db with 181 entity classes and 278 predicates. The graph links subjects (people, apps, topics) to objects (names, dates) via predicates that describe relationships such as “has religion” or “face [...]