pngcheck
pngcheck verifies the integrity of PNG, JNG, and MNG files by checking the internal 32-bit CRCs and decompressing the image data. It can dump chunk-level information in human-readable form, print basic image statistics, list color and transparency info, and extract embedded text annotations. This command-line program has batch capabilities.
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A lightweight CTF platform inspired by motherfuckingwebsite.com with a focus on challenge difficulty.
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