# libprio-rs
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Pure Rust implementation of [Prio](https://crypto.stanford.edu/prio/), a system for Private, Robust,
and Scalable Computation of Aggregate Statistics.

## Exposure Notifications Private Analytics

This crate is used in the [Exposure Notifications Private Analytics][enpa] system. This is supported
by the interfaces in modules `server` and `client` and is referred to in various places as Prio v2.
See [`prio-server`][prio-server] or the [ENPA whitepaper][enpa-whitepaper] for more details.

## Verifiable Distributed Aggregation Function (EXPERIMENTAL)

Crate `prio` also implements a [Verifiable Distributed Aggregation Function
(VDAF)][vdaf] called "Prio3", implemented in the `vdaf` module, allowing Prio to
be used in the [Distributed Aggregation Protocol][dap] protocol being developed
in the PPM working group at the IETF. This support is still experimental, and is
evolving along with the DAP and VDAF specifications. Formal security analysis is
also forthcoming. Prio3 should not yet be used in production applications.

[enpa]: https://www.abetterinternet.org/post/prio-services-for-covid-en/
[enpa-whitepaper]: https://covid19-static.cdn-apple.com/applications/covid19/current/static/contact-tracing/pdf/ENPA_White_Paper.pdf
[prio-server]: https://github.com/divviup/prio-server
[vdaf]: https://datatracker.ietf.org/doc/draft-irtf-cfrg-vdaf/
[dap]: https://datatracker.ietf.org/doc/draft-ietf-ppm-dap/