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arXiv · 2605.16437

One-hot Coding-based URA with RFFI-Enabled Message Authentication

Wenbo Fan·Zeping Sui·Yuhei Takahashi·Jun Cheng·Zilong Liu·Pingzhi Fan
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Abstract

Unsourced random access (URA) has emerged as a promising paradigm for enabling massive connectivity in Internet-of-Things (IoT) networks. However, since URA transmissions do not contain device identifiers, the receiver may not associate decoded messages with their originating devices, introducing a security vulnerability: forged messages may be decoded as legitimate. To address this problem, this paper proposes a one-hot coding (OHC)-based URA framework that enables message authentication while preserving the unsourced transmission principle. Specifically, distinct messages are mapped onto orthogonal channel uses via an OHC-based common codebook and transmitted using on-off keying modulation. The resulting orthogonal channel structure enables radio-frequency fingerprint identification to authenticate received signals by exploiting device-specific hardware impairments, thereby authenticating decoded messages without introducing an additional authentication payload. Analytical expressions for the per-user probability of error and the probability of successful spoofing are derived. Numerical results demonstrate that the proposed scheme enables secure URA transmission while maintaining reliable communication performance in ultra-short-payload IoT scenarios.

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Wenbo Fan, Zeping Sui, Yuhei Takahashi, Jun Cheng, Zilong Liu, Pingzhi Fan. 2026-05-14. One-hot Coding-based URA with RFFI-Enabled Message Authentication. https://arxiv.org/abs/2605.16437

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