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arXiv · 2604.13419

Physically-Guided Optical Inversion Enable Non-Contact Side-Channel Attack on Isolated Screens

Zhiwen Zheng·Yuheng Qiao·Xiaoshuai Zhang·Zhao Huang·Tao Zhang·Huiyu Zhou·Shaowei Jiang·Jin Liu·Wenwen Tang·Xingru Huang
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Abstract

Noncontact exfiltration of electronic screen content poses a security challenge, with side-channel incursions as the principal vector. We introduce an optical projection side-channel paradigm that confronts two core instabilities: (i) the near-singular Jacobian spectrum of projection mapping breaches Hadamard stability, rendering inversion hypersensitive to perturbations; (ii) irreversible compression in light transport obliterates global semantic cues, magnifying reconstruction ambiguity. Exploiting passive speckle patterns formed by diffuse reflection, our Irradiance Robust Radiometric Inversion Network (IR4Net) fuses a Physically Regularized Irradiance Approximation (PRIrr-Approximation), which embeds the radiative transfer equation in a learnable optimizer, with a contour-to-detail cross-scale reconstruction mechanism that arrests noise propagation. Moreover, an Irreversibility Constrained Semantic Reprojection (ICSR) module reinstates lost global structure through context-driven semantic mapping. Evaluated across four scene categories, IR4Net achieves fidelity beyond competing neural approaches while retaining resilience to illumination perturbations.

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Zhiwen Zheng, Yuheng Qiao, Xiaoshuai Zhang, Zhao Huang, Tao Zhang, Huiyu Zhou, Shaowei Jiang, Jin Liu, Wenwen Tang, Xingru Huang. 2026-04-15. Physically-Guided Optical Inversion Enable Non-Contact Side-Channel Attack on Isolated Screens. https://arxiv.org/abs/2604.13419

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