Chapter

Advances in Cryptology — CRYPTO ’91

Volume 576 of the series Lecture Notes in Computer Science pp 338-350

Date:

How to Break and Repair a “Provably Secure” Untraceable Payment System

Extended Abstract
  • Birgit PfitzmannAffiliated withInstitut für Informatik, Universität Hildesheim
  • , Michael WaidnerAffiliated withInstitut für Rechnerentwurf und Fehlertoleranz, Universität Karlsruhe

Abstract

On Crypto’ 88, an untraceable payment system with provable security against abuse by individuals was presented by Damgård. We show how to break the untraceability of that system completely.

Next, an improved version of the system is presented. We also augment the system by security for the individuals against loss of money, and we introduce the possibility of receipts for payments. Finally, whereas all this concerned an on-line system, we present a similar construction for untraceable electronic cash.