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Screening Robust Cover for JPEG Steganography
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Summary
Researchers propose a robust cover screening method so that hidden messages survive JPEG recompression by online social networks, even when paired with non-robust steganographic embedding. The method, Robustness-Minimizing Modification (RMM), simulates the worst-case effect of embedding on cover robustness, and images unchanged by JPEG recompression after RMM are screened as robust covers. Experiments show such covers exist widely in natural and generated images, and they achieve 100% message extraction at high embedding rates while keeping security comparable to other covers.