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Verifiable Oblivious PRF

September 28, 2023


Armando Faz Hernandez - Cloudflare, Inc


Abstract. In this presentation we present current work in progress specification for Verifiable Oblivious PRFs, developed at IETF/CFRG. An Oblivious Pseudorandom Function (OPRF) is a party protocol between client and server for computing the output of a Pseudorandom Function (PRF). The protocol is verifiable if the client can verify whether the server used a specific key.  A (V)OPRF is used as a building block for other protocols such as in Privacy Pass unlikable tokens and in OPAQUE, a password-authenticated key exchange. Finally, a Discrete-Logarithm Equivalence (DLEQ) zero knowledge-proof is also defined as part of the specification.

[Slides] [Video]

Presented at

MPTS 2023: NIST Workshop (virtual) on Multi-Party Threshold Schemes 2023

Event Details



Related Topics

Security and Privacy: cryptography

Created September 21, 2023, Updated November 02, 2023