52 lines
1.5 KiB
Markdown
52 lines
1.5 KiB
Markdown
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## The Adventures of Boris Ivanov Part 2
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The main idea finding the flag using OpenCV library and Python.
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#### Step-1:
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After we download `confetti.zip`, we see that we have 500 photos.
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Each dimension is 500 $\times$ 1 and according to problem statement, the image size is 500 $\times$ 500.
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#### Step-2:
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So basically, we have to concatenate the 500 images in **vertical** fashion.
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#### Step-3:
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Make a directory to extract all 500 images and set your `pwd` to that directory containing all images.
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After that only work is to join all images.
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#### Step-5:
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I executed this simple `Concatenate.py` script and it worked.
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```
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from PIL import Image
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listimages=[]
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for i in range(0,500):
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listimages.append(Image.open(str(i) + ".png")) # Make a list of pointers to the 500 pictures.
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concatenate=Image.new("RGB",(500,500)) # Size of the concatenate picture
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Y_offset=0
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for i in listimages:
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concatenate.paste(i,(0,Y_offset))
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Y_offset+=1 # Add 1 at a time , Because the height of each picture is 1.
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concatenate.save("concatenate.png")
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```
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#### Step-6:
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We get the output as `concatenate.png` after the above script is run. The image is as follows:
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<img src="concatenate.png">
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We see a hex code in between.
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#### Step-7:
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The Hex code is as follows:
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`66 6c 61 67 7b 74 68 33 5f 4b 47 42 5f 6c 30 76 33 73 5f 43 54 46 7d`
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I converted it to text online to get the flag.
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#### Step-7:
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Finally the flag becomes:
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`flag{th3_KGB_l0v3s_CTF}`
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