How can we make authentication de-identified?
The idea behind DIT is to collect de-identified analytics data from client applications (or “clients”) in a way that is also authenticated, which may sound counterintuitive. To start, we have to explain what types of data can be gathered from a client. Th...
The new logging workflow
Here is how the new logging workflow functions: For the first step:1.) Initially, the WhatsApp mobile client obtains a batch of tokens from our servers using a Verifiable Oblivious Pseudorandom Functions (VOPRF) scheme. Each token is an evaluation of...
Deploying DIT at scale
There are several practical considerations and challenges when deploying DIT and the ACS at scale. Here is how we addressed some significant ones in testing:The Curve Choice: Deciding which encryption curve to use is an important part of the protocol ...
What’s next for DIT
Our ethos at WhatsApp has always been to provide a simple, reliable service at scale that preserves the privacy of the people who choose to use it. We believe that additional privacy preserving techniques both at the time of collection, (e.g. local differential privacy), and after collection, (e.g. global differential privacy), can further strengthen our privacy guarantees. There is a long road from testing this technology to fully utilizing it without any redundancies in place, but we are excited to be on this journey. We’re looking forward to seeing how our testing performs and making any necessary refinements . DIT is part of a broader initiative across Facebook to build and deploy features and infrastructure that can further enhance user privacy and minimize data collection. More information about other privacy preserving technologies in development can be found here.
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