Isogeny-based Post-Quantum Proxy Signature for Internet of Things
This addresses secure delegation in IoT against quantum threats, but it is incremental as it adapts existing isogeny-based methods to a specific application.
The paper tackles secure authentication and delegation for IoT devices by proposing an isogeny-based post-quantum proxy signature scheme, achieving quantum-resistant security with efficiency suitable for resource-constrained environments.
The rapid growth of the Internet of Things (IoT) introduces challenges in secure authentication and delegation due to the limited computational capabilities of devices. Proxy signature schemes offer an effective solution by enabling controlled delegation of signing rights to more capable entities, such as gateway nodes. However, most existing schemes rely on classical assumptions that are likely to be broken by quantum adversaries. In this work, we address these challenges by proposing an isogeny-based post-quantum proxy signature scheme, \textit{CSI-PS}. The scheme leverages the hardness of the Group Action Inverse Problem (GAIP) to ensure quantum-resistant security while maintaining efficiency suitable for resource-constrained environments. We further demonstrate its applicability in IoT architectures through a gateway-based delegation model. Our analysis shows that the proposed scheme strikes an effective balance between security and efficiency in terms of computation and communication overhead, along with provable security under the EUF-CMA notion.