TLDR Tech / InfoSec
How We're Building Scam Alert on WhatsApp With End-to-End Encryption and Verifiability Guarantees (11 minute read)
WhatsApp's beta Scam Alert scans non-contact messages locally for scam patterns. Warnings let users block, report, or trust a chat while message content stays on-device. Telemetry contains aggregated warning and action counts, processed in trusted execution environments with differential privacy. Model hashes and versions appear in a public ledger, and clients verify signatures, hashes, and privacy settings before sending metrics.
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