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Deep neural networks have been widely used in various downstream tasks,
especially those safety-critical scenario such as autonomous driving, but deep
networks are often threatened by adversarial samples. Such adversarial attacks
can be invisible to human eyes, but can lead to DNN misclassification, and
often exhibits transferability between deep learning and machine learning
models and real-world achievability. Adversarial attacks can be divided into
white-box attacks, for which the attacker knows the parameters and gradient of
the model, and black-box attacks, for the latter, the attacker can only obtain
the input and output of the model. In terms of the attacker's purpose, it can
be divided into targeted attacks and non-targeted attacks, which means that the
attacker wants the model to misclassify the original sample into the specified
class, which is more practical, while the non-targeted attack just needs to
make the model misclassify the sample. The black box setting is a scenario we
will encounter in practice.