Access Control in Cloud-Based Computing Environments Using a Novel Quantum Digital Signature Scheme
Abstract
Access control in cloud-based computing environments is in essence a security mechanism enabling decisions as to which subjects may access which protected resources and under what operations. The rapid emergence of quantum computing threatens the hardness assumptions underlying classical digital signatures and public‑key infrastructures. The authors of this work recently proposed a novel quantum ice-cream model to demonstrate the basic concepts of quantum cryptography in a simple and intuitive manner. In this work we present a novel quantum ice-cream digital signature scheme by using our proposed quantum ice-cream model. Our quantum ice-cream digital signature scheme maps two non-commuting measurement bases to the ‘flavor’ and ‘shape’ attributes of the quantum ice-cream model. It achieves information-theoretic security against forgery and repudiation via threshold tests and natively supports signer–verifier–arbiter workflow that is suitable for cloud access control. Although our scheme is presented theoretically, a rigorous mathematical analysis has been carried out using Hoeffding-type inequalities. We also discuss the implementation of our proposed scheme by using weak-coherent BB84-like optics with decoy states. This article demonstrates that our proposed quantum ice-cream digital signature scheme preserves the practicality of memoryless quantum digital signature schemes while aligning with cloud authorization requirements. Furthermore, we draw analogies between the design of our proposed QIDS and robust control theory to provide an interdisciplinary perspective on system stability and security.
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