20 lines
503 B
Python
Executable File
20 lines
503 B
Python
Executable File
#!/home/maxime/.pyvenv/bin/python3
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with open("encoded.bmp", 'rb') as f:
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img = f.read()
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flag_len = 50
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stego_len = flag_len * 8
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stego_start = 2000
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encoded_bytes = img[stego_start:stego_start + stego_len]
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flag_buffer = [''] * flag_len
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for i, flag_char in enumerate(flag_buffer):
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char = 0
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for j in range(8):
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img_char = encoded_bytes[i*8+j]
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char |= (img_char & 1) << j
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flag_buffer[i] = chr(char + 5)
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print(''.join(flag_buffer))
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