Subject: [CFRG] VOPRF with public metadata bits

From: Subodh Iyengar <[email-masked]>
Date: Tue, 23 Feb 2021 20:04:42 +0000

In the privacy pass mailing list, we've been discussing the need for several applications that want to use privacy pass to be able to embed public metadata in a verifiable way to the VOPRF used by privacy pass.

We've put together an initial draft describing a way to embed public metadata into VOPRF keys https://tools.ietf.org/html/draft-iyengar-cfrg-voprfmetadata-00 by embedding the metadata
into the keys that are used for the EC VOPRF in https://datatracker.ietf.org/doc/draft-irtf-cfrg-voprf/. The construction described here is based on a recent scheme in https://research.fb.com/privatestats.

Time permitting, I'd like to request some time on the agenda to present this at IETF 110.

Subodh