문제 파일 까면 png 이미지 하나 있다. 이미지만 있는걸로 봐서는 스테가노그래피 문제인 듯 싶다. https://incoherency.co.uk/image-steganography/ Image Steganography Each channel (red, green, blue) of each pixel in an image is represented by an 8-bit value. To hide the secret image inside the cover image, we replace the n least significant bits of the cover pixel value with the same number of most significant bits from incoherency.co.uk ..