WhatsApp Begins Beta Testing On-Device Scam Alerts
Summary
WhatsApp is beta-testing an optional on-device machine-learning feature that flags suspicious messages from non-contacts. The company says message content stays on-device, with model releases and limited usage analytics subject to safeguards.
Key points
- WhatsApp says Scam Alert uses an on-device model to assess incoming messages from non-contacts for scam-related conversational patterns and linguistic cues.
- The company says message content is not automatically sent to WhatsApp or Meta; users can block, report, ignore, or trust a flagged conversation.
- Users who mark a chat as trusted can separately choose to share the last five messages received to help refine the model.
- WhatsApp says model releases must be logged on a third-party append-only ledger; devices verify signed manifests and file hashes before running a model.
- The company says its confidential federated analytics pipeline collects counts of alerts and subsequent user actions, not message content.
- The feature is an early technical preview; WhatsApp says it expanded its bug bounty coverage and researchers tested the system ahead of beta.
Article Details
- Event Type
- Security feature announcements and limited beta rollout
- Impact
- WhatsApp is testing Scam Alert, an optional on-device feature that flags suspicious messages from non-contacts without automatically sending message content to WhatsApp or Meta. Signal introduced Automatic Key Verification to help users detect unauthorized changes to public keys. Both features add security checks while retaining end-to-end encryption; WhatsApp describes its release as an early technical preview.
Vendors
Cloudflarethe model weights and related files, with the manifest digest signed using Ed25519 keys held by Cloudflare rather than Meta. Devices verify this signature, cross-check it against the ledger, and confirm theSignalSignal announces automatic key verificationTrail of BitsCloudflare and Trail of Bits act as independent auditors of this log.WhatsAppWhatsApp has begun a limited beta rollout of Scam Alert, an optional feature that uses an on-device machine learning model to flag suspicious messages from non-contacts.
Products
Automatic Key VerificationSignal announces automatic key verificationScam AlertWhatsApp has begun a limited beta rollout of Scam Alert, an optional feature that uses an on-device machine learning model to flag suspicious messages from non-contacts.SignalSignal announces automatic key verificationWhatsAppWhatsApp has begun a limited beta rollout of Scam Alert, an optional feature that uses an on-device machine learning model to flag suspicious messages from non-contacts.