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2026/srdnlen_quals/forensic/chapter2/output/bmp/xor_bmp.py

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+import os
+from PIL import Image
+import numpy as np
+
+# Find all BMP files in the current directory
+bmps = [f for f in os.listdir('.') if f.endswith('.bmp')]
+print(bmps)
+images = {}
+
+for b in bmps:
+    try:
+        img = np.array(Image.open(b))
+        shape = img.shape
+        # Group images by their exact pixel dimensions
+        if shape not in images:
+            images[shape] = []
+        images[shape].append((b, img))
+    except Exception as e:
+        pass
+
+print(images.items())
+
+# Find the pair of relics and XOR them
+for shape, imgs in images.items():
+    print(len(imgs))
+    if len(imgs) == 2:
+
+        print(f"[+] Found matching relics: {imgs[0][0]} and {imgs[1][0]}")
+        
+        # This is the "remember to XOR"
+        result = np.bitwise_xor(imgs[0][1], imgs[1][1])
+        
+        out_name = f"final_armory_{imgs[0][0]}.png"
+        Image.fromarray(result).save(out_name)
+        print(f"[!] The forge is lit. Open {out_name} to claim the flag.")
+    else:
+        print("found no pairs")