Poster: Query-efficient Black-box Attack for Image Forgery Localization via Reinforcement Learning

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Presented at ACM CCS 2023 by

Jiwu Huang

Bin Li

Xianbo Mo

Shunquan Tan

Recently, deep learning has been widely used in forensics tools to detect and localize forgery images. However, its susceptibility to adversarial attacks highlights the need for the exploration of anti-forensics research. To achieve this, we introduce an innovative and query-efficient black-box anti-forensics framework tailored for the generation of adversarial forgery images. This framework is designed to simulate the query dynamics of online forensic services, utilizing a Markov Decision Process formulation within the paradigm of reinforcement learning. We further introduce a novel reward function, which evaluates the efficacy of attacks based on the disjunction between query results and attack targets. To improve the query efficiency of these attacks, an actor-critic algorithm is employed to maximize cumulative rewards. Empirical findings substantiate the efficacy of our proposed methodology. Specifically, it demonstrates pronounced adversarial effects on a range of prevailing image forgery detectors, while ensuring negligible visually perceptible distortions in the resultant anti-forensics images.