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NBA:defensive distillation for backdoor removal via neural behavior alignment

Cybersecurity 2023年第4期6卷 76-87页

作者： Zonghao Ying Bin Wu State Key Laboratory of Information Security Institute of Information EngineeringChinese Academy of SciencesBeijingChina School of Cyber Security University of Chinese Academy of SciencesBeijingChina

Recently,deep neural networks have been shown to be vulnerable to backdoor attacks.A backdoor is inserted into neural networks via this attack paradigm,thus compromising the integrity of the network.As soon as an attacker presents a trigger during the testing phase,the backdoor in the model is activated,allowing the network to make specific wrong predictions.It is extremely important to defend against backdoor attacks since they are very stealthy and dangerous.In this paper,we propose a novel defense mechanism,Neural Behavioral Alignment(NBA),for backdoor removal.NBA optimizes the distillation process in terms of knowledge form and distillation samples to improve defense performance according to the characteristics of backdoor defense.NBA builds high-level representations of neural behavior within networks in order to facilitate the transfer of knowledge.Additionally,NBA crafts pseudo samples to induce student models exhibit backdoor neural behavior.By aligning the backdoor neural behavior from the student network with the benign neural behavior from the teacher network,NBA enables the proactive removal of backdoors.Extensive experiments show that NBA can effectively defend against six different backdoor attacks and outperform five state-of-the-art defenses.

关键词： Deep neural network backdoor removal Knowledge distillation

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