WhatsApp Private Processing - Kevin Hui, Yunqi Li, Elizabeth Li, Henry Wang & Varun Patil, Meta

WhatsApp (Meta) launched its flagship Confidential Computing use-case last year (https://engineering.fb.com/2025/04/29/security/whatsapp-private-processing-ai-tools/), introducing one of the first large-scale applications of confidential computing. In this presentation, we will go over an overview of how Private Processing works, the operational lessons we learned while deploying confidential virtual machines at the scale of WhatsApp, and where we think the evolution of our Private Processing stack will take us for years to come. Topics: - CVM hardening - Binary transparency - OHTTP - Remote Attestation TLS (RA-TLS) - Debugging CVMs in production - Virtual Research Environment - And others