Apple’s Real World Deployment of Homomorphic Encryption at Scale
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Presented at Real World Crypto 2025 by
The primary objective of this talk is to report to the community about Apple’s successful real-world deployment of efficient Homomorphic Encryption (HE) systems while overcoming key challenges encountered at this scale. Specifically, this talk will walk through the details on Apple’s implementation of HE, Private Information Retrieval (PIR) and Private Nearest Neighbor Search (PNNS) in features such as Photos, Safari, Mail, and the Phone app, addressing key optimizations applied to the algorithms and end-to-end system design.