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arXiv 2605.07398cs.CVcs.AI

揭示并缓解深度伪造视频检测中的时间攻击

Exposing and Mitigating Temporal Attack in Deepfake Video Detection

Peking University(北京大学);New York University(纽约大学);Huzhou University(湖州大学);Institute of Science Tokyo(东京科学研究院);Guangdong Institute of Intelligence Science and Technology(广东省智能科学与技术研究院)

Zheyuan Gu, Minghao Shao, Zhen Wang, Yusong Wang, Mingkun Xu, Shijie Zhang, Hao Jiang

AI总结:

本文提出SpInShield框架,通过分离语义运动与可操控频谱特征,缓解深度伪造检测器对逃避攻击的脆弱性,并在模拟频谱攻击中提升AUC性能。

摘要:

尽管时空深度伪造检测器在AUC上表现优异,但我们的实验揭示了其对逃避攻击的易感性。这些模型倾向于过度拟合脆弱的时间频谱线索,而非学习稳健的语义因果关系。为缓解这一漏洞,我们提出SpInShield,一种专门设计用于解耦语义运动与可操控频谱伪影的时间频谱不变防御框架。我们提出一个可学习的频谱对抗者,动态合成严重的频谱变形,模拟极端攻击场景。通过采用快捷抑制优化策略,SpInShield迫使编码器提取可靠的取证线索,同时从潜在空间中清除不稳定的频谱统计。实验表明,SpInShield在广泛使用的数据集上取得竞争力表现,并在模拟振幅频谱攻击下,AUC比最强基线高出21.30个百分点。

英文摘要:

While spatiotemporal deepfake detectors achieve high AUC, our experiments reveal their susceptibility to evasion attacks. These models tend to overfit on fragile temporal spectrum cues, rather than learning robust semantic causality. To mitigate this vulnerability, we propose SpInShield, a temporal spectral-invariant defense framework explicitly designed to decouple semantic motion from manipulatable spectral artifacts. We propose a learnable spectral adversary that dynamically synthesizes severe spectral deformations, simulating extreme attack scenarios. By employing a shortcut suppression optimization strategy, SpInShield compels the encoder to extract reliable forensic cues while purging unstable spectral statistics from the latent space. Experiments show that SpInShield obtains competitive performance on widely used datasets and outperforms the strongest baseline by 21.30 percentage points in AUC under simulated amplitude spectral attacks.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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