---
title: "多址接入信道上语义通信的无线后门攻击与防御"
source: "arXiv AI/CL/LG（论文）"
source_tier: "t2"
url: "https://arxiv.org/abs/2606.30595v1"
permalink: "https://feed.astralor.com/items/itm_23610d1dca863ae8eb173084"
published: "2026-06-29T17:36:09.000Z"
score: 55
channel: "tech"
tags: ["后门攻击","多址接入信道","无线安全","语义通信","防御机制"]
---

# 多址接入信道上语义通信的无线后门攻击与防御

## 速览

本文研究多用户共享接入无线网络中语义通信的新安全漏洞。针对两发射机通过多址接入信道与公共接收机通信的场景，提出一种选择性无线后门攻击：攻击者在训练阶段发送低功率触发波形注入共享信号，测试阶段通过再次发送触发信号，选择性操纵其中一个发射机的语义推理，而对另一个影响极小。同时开发了触发感知防御机制，在触发污染观测下保持正确语义标签。实验证明了攻击的有效性和防御的可行性。

## 关键点

- 提出针对多址接入信道语义通信的选择性无线后门攻击
- 攻击通过训练时注入低功率触发波形，测试时选择性操纵单用户语义推理
- 开发触发感知防御机制，在触发污染下保护语义标签正确性
- 实验验证了攻击威胁和防御有效性

## 全文

Semantic communication (SemCom) aims to preserve semantic meaning and task-oriented information beyond conventional message recovery over wireless channels. The adoption of SemCom in shared-access wireless networks introduces new vulnerabilities for multi-user semantic inference. This paper considers a SemCom system for two transmitters communicating with a common receiver over a multiple access channel. Each transmitter maps source information into latent semantic representations, while the receiver jointly reconstructs and classifies the semantic information for both transmitters. A selective over-the-air backdoor (Trojan) attack is presented in which an adversary transmits a low-power trigger waveform over the air and injects it into the shared received signal during training. By transmitting the trigger again during testing, this stealthy, low-power attack selectively manipulates the semantic inference for one transmitter while minimally affecting the inference of the other transmitter. To mitigate this vulnerability, a trigger-aware defense mechanism is developed to preserve correct semantic labels under trigger-contaminated wireless observations. The results demonstrate both the vulnerability of shared-access SemCom systems to selective over-the-air backdoor attacks and the effectiveness of trigger-aware robust training for semantic protection.

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引用前请核对原文;本文由星际流动整理:https://feed.astralor.com/items/itm_23610d1dca863ae8eb173084