WhatsApp introduced Scam Alert, an optional on-device machine learning feature designed to warn users of potential scam messages while maintaining end-to-end encryption.

Key Details

• The feature runs an on-device machine learning model to classify scam patterns without message content leaving the device.
• Model versions and manifests are signed by Cloudflare using Ed25519 keys and published on a public append-only transparency ledger to prevent targeted model delivery.
• Anonymous warning counts and user actions are processed via confidential federated analytics in Trusted Execution Environments (TEEs) with differential privacy.
• The feature is launching in limited Beta with an expanded Bug Bounty program for independent security researchers.

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