Adversarial Detection from Derived Models

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Abstract
Deep Neural Networks (DNNs) can be easily fooled by inputs that are crafted by adversaries. For example, an adversarial image can be forged by adding to an image a tiny perturbation which is often unnoticeable by human eyes, though the semantic interpretations of the original image and the adversarial image, which are represented as outputs of a DNN, may be drastically different. This weakness can potentially lead to serious consequences in security-critical applications such as medical diagnostic tests and self-driving vehicles. Most existing approaches for adversarial detection only have satisfactory performance for specific types of attacks. These methods do not generalize their performances when applied to a broad range of attacks, models or datasets. In this work, we propose a new adversarial detection method called Adversarial Detection from Derived Models (ADDM), which applies derived models to “simulate” the functionality of a DNN, and analyzes the distribution for the neuron activation values in the derived models as indicators for adversarial inputs. In order to further enhance performance, we propose a heuristic that selects neurons from the derived models that are sensitive to perturbations. We compare our approach with six existing adversarial detection approaches of different methodologies, and the experimental result confirms that the proposed approach has generally better performance regarding stability over different types of adversarial attacks on a variety of tested DNN models and datasets.

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