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RFC 9497
Title: Oblivious Pseudorandom Functions (OPRFs) Using
Prime-Order Groups
Author: A. Davidson,
A. Faz-Hernandez,
N. Sullivan,
C. A. Wood
Status: Informational
Stream: IRTF
Date: December 2023
Mailbox: [email protected],
[email protected],
[email protected],
[email protected]
Pages: 61
Updates/Obsoletes/SeeAlso: None
I-D Tag: draft-irtf-cfrg-voprf-21.txt
URL: https://www.rfc-editor.org/info/rfc9497
DOI: 10.17487/RFC9497
An Oblivious Pseudorandom Function (OPRF) is a two-party protocol
between a client and a server for computing the output of a
Pseudorandom Function (PRF). The server provides the PRF private key,
and the client provides the PRF input. At the end of the protocol,
the client learns the PRF output without learning anything about the
PRF private key, and the server learns neither the PRF input nor
output. An OPRF can also satisfy a notion of 'verifiability', called
a VOPRF. A VOPRF ensures clients can verify that the server used a
specific private key during the execution of the protocol. A VOPRF
can also be partially oblivious, called a POPRF. A POPRF allows
clients and servers to provide public input to the PRF computation.
This document specifies an OPRF, VOPRF, and POPRF instantiated within
standard prime-order groups, including elliptic curves. This document
is a product of the Crypto Forum Research Group (CFRG) in the IRTF.
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