Privacy-Preserving Trust Management Mechanisms from Private Matching Schemes

TL;DR

This paper introduces a privacy-preserving trust management method using secure two-party computation protocols for set intersection, enabling parties to exchange credentials without revealing their preferences.

Contribution

It proposes a novel approach combining private matching schemes with trust management to enhance privacy during credential exchange.

Findings

The method effectively preserves privacy during trust establishment.

It utilizes secure two-party computation protocols for set intersection.

The approach is applicable to privacy-sensitive online trust scenarios.

Abstract

Cryptographic primitives are essential for constructing privacy-preserving communication mechanisms. There are situations in which two parties that do not know each other need to exchange sensitive information on the Internet. Trust management mechanisms make use of digital credentials and certificates in order to establish trust among these strangers. We address the problem of choosing which credentials are exchanged. During this process, each party should learn no information about the preferences of the other party other than strictly required for trust establishment. We present a method to reach an agreement on the credentials to be exchanged that preserves the privacy of the parties. Our method is based on secure two-party computation protocols for set intersection. Namely, it is constructed from private matching schemes.