Signing Perfect Currency Bonds
This work addresses secure payment systems for banking clients, offering a quantum alternative to current e-payment gateways, but it appears incremental as it builds on quantum cryptography concepts.
The authors tackled the problem of secure digital payments by proposing a Quantum Cheque Scheme, a cryptographic protocol that prevents counterfeiting and alteration, and they demonstrated its unconditional security against no-signaling adversaries.
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.