HOW WE'RE BUILDING SCAM ALERT ON WHATSAPP WITH END-TO-END ENCRYPTION AND VERIFIABILITY GUARANTEES

Summary from the TLDR InfoSec newsletter

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.