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Robustness analysis results for CIES-DVEM: (a1–a4) are four encrypted images with data missing from different locations; (b1–b4) are decrypted images for (a1–a4); (a5–a8) are four encrypted images with salt and pepper noise intensities of 0.03/0.06/0.09/0.12, respectively; (b5–b8) are decrypted images for (a5–a8).
