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passive defense 被动防御

不改变model,增加一个Anomaly Detection

增加一个filter,例如smoothing

Feature Squeeze

Randomization at Inference Phase

缺点

如果防御机制泄漏,攻击仍会生效

Proactive Defence 主动防御

Training a model that is robust to adversarial attack

找出漏洞,补起来

根据图像攻击算法,找到攻击图像,把攻击图像当作训练样本来训练

缺点

训练时只能列举有限的攻击算法,换用算法攻击,仍然能攻破