WhatsApp Reveals "Private Processing" Feature for Cloud Based AI Features

WhatsApp claims even it can not process private data

WhatsApp has introduced ‘Private Processing,’ a new tech that allows users to use advanced AI features by offloading tasks to privacy-preserving cloud servers, without exposing their chat to Meta. Meta claims even it cannot see the messages while processing them. The system employs encrypted cloud infrastructure and hardware-based isolation without making it visible to anyone, even Meta, or processing data. 

About private processing

For those who decide to use Private Processing, the system works in an obscure verification via the user’s WhatsApp client to confirm the user’s validity. 

Meta claims this system keeps WhatsApp’s end-to-end encryption intact while offering AI features in chats. However, the feature currently applies only to select use cases and excludes Meta’s broader AI deployments, including those used in India’s public service systems.

Private processing employs Trusted Execution Environments (TEEs) — safe virtual machines that use cloud infrastructure to keep AI requests hidden. 

About the system

• Performs encryption of user requests from the system to the TEE utilizing end-to-end encryption
• Encrypts user requests from the device to the TEE using end-to-end encryption
• Restricts storage or logging of messages post-processing
• Reports logs and binary images for external verification and audits

WhatsApp builds AI through wider privacy concerns

According to Meta, the Private processing is a response to privacy questions around AI and messaging. WhatsApp has now joined other companies like Apple that have introduced confidential AI computing models in the previous year. “To validate our implementation of these and other security principles, independent security researchers will be able to continuously verify our privacy and security architecture and its integrity,” Meta said.

It is similar to Apple’s private cloud computing in terms of public transparency and stateless processing. Currently, however, WhatsApp is using them only for select features. Apple, on the other hand, has declared plans to implement this model throughout all its AI tools, whereas WhatsApp has not made such claims, yet. 

WhatsApp says, “Private Processing uses anonymous credentials to authenticate users over OHTTP. This way, Private Processing can authenticate users to the Private Processing system but remains unable to identify them.”