Signing Perfect Currency Bonds

TL;DR

This paper introduces a Quantum Cheque Scheme that enables secure, unforgeable digital payments using quantum cryptography, providing an unconditionally secure alternative to electronic payment systems.

Contribution

It formally defines a Quantum Cheque and presents the first unconditionally secure quantum cheque scheme resistant to no-signaling adversaries.

Findings

First unconditionally secure quantum cheque scheme

Secure against no-signaling adversaries

Quantum analogue of electronic data interchange

Abstract

We propose the idea of a Quantum Cheque Scheme, a cryptographic protocol in which any legitimate client of a trusted bank can issue a cheque, that cannot be counterfeited or altered in anyway, and can be verified by a bank or any of its branches. We formally define a Quantum Cheque and present the first Unconditionally Secure Quantum Cheque Scheme and show it to be secure against any no-signaling adversary. The proposed Quantum Cheque Scheme can been perceived as the quantum analog of Electronic Data Interchange, as an alternate for current e-Payment Gateways.