A schematic diagram of frequency band division. (a), (b), (c), and (d) represent the low, medium-low, medium-high, and high-frequency bands, respectively.

A schematic diagram of frequency band division. (a), (b), (c), and (d) represent the low, medium-low, medium-high, and high-frequency bands, respectively.

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Deep neural networks (DNNs) have been closely related to the Pandora’s box from the moment of its birth. Although it achieves a high accuracy significantly in real-world tasks (e.g., object detecting and speech recognition), it still retains fatal vulnerabilities and flaws. Malicious attackers can manipulate DNN model misclassification just by addi...

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