An efficient and secure quantum blind signature‐based electronic cash transaction scheme

• Published in: IET quantum communication 2024-12, Vol.5 (4), p.619-631
• Main Authors: Gupta, Aman, Chandra, Gunja Venkat, Das, Nayana, Paul, Goutam
• Format: Article
• Language: English
• Subjects: quantum communication; quantum computing; quantum computing techniques; quantum cryptography; quantum information; telecommunication security
• ISSN: 2632-8925; 2632-8925
• DOI: 10.1049/qtc2.12109

The authors present a novel token exchange scheme with an example of an electronic cash (eCash) transaction scheme that ensures quantum security, addressing the vulnerabilities of existing models in the face of quantum computing threats. The authors’ comprehensive analysis of various quantum blind signature mechanisms revealed significant shortcomings in their applicability to eCash transactions and their resilience against quantum adversaries. In response, the authors drew inspiration from D. Chaum's original classical eCash scheme and innovated a quantum‐secure transaction framework. The authors detail the developed protocol and rigorously evaluate its security aspects. The protocol's adherence to critical security requirements such as blindness, non‐forgeability, non‐deniability, and prevention of double spending is analysed. Moreover, the scheme against Intercept and Resend, Denial of Service, Man‐in‐the‐Middle, and Entangle‐and‐Measure attacks is rigorously tested. The authors’ findings indicate a robust eCash transaction model capable of withstanding the challenges posed by quantum computing advancements. The authors introduce a novel electronic cash (eCash) transaction scheme designed for quantum security, addressing weaknesses in existing models against quantum computing threats. By analysing various quantum blind signature mechanisms, the study identifies shortcomings and proposes an innovative quantum‐secure transaction framework inspired by D. Chaum's classical eCash scheme. The developed protocol is rigorously evaluated for security aspects, demonstrating robustness against quantum adversaries and meeting critical security requirements such as blindness, non‐forgeability, and prevention of double spending.