stegoPromedium

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tamuctf

Task: QR code image that cannot be decoded by standard readers due to applied XOR mask. Solution: Identified checkerboard XOR pattern (QR Mask Pattern 0) by comparing corrupted finder patterns with expected structure, applied inverse XOR to restore valid QR code.

$ ls tags/ techniques/
pngqr_codexor_maskcheckerboard_patternpalette_image
xor_deobfuscationqr_mask_pattern_removalfinder_pattern_analysismodule_grid_extraction
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