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information

Problem

Files can always be changed in a secret way. Can you find the flag? cat.jpg

Solution

  1. 1.
    Download the image and use exiftool cat.jpg. The license field looks suspicious:
    ExifTool Version Number : 12.16
    File Name : cat.jpg
    Directory : .
    File Size : 858 KiB
    File Modification Date/Time : 2021:03:15 14:24:46-04:00
    File Access Date/Time : 2021:03:16 15:08:38-04:00
    File Inode Change Date/Time : 2021:03:16 15:08:32-04:00
    File Permissions : rw-r--r--
    File Type : JPEG
    File Type Extension : jpg
    MIME Type : image/jpeg
    JFIF Version : 1.02
    Resolution Unit : None
    X Resolution : 1
    Y Resolution : 1
    Current IPTC Digest : 7a78f3d9cfb1ce42ab5a3aa30573d617
    Copyright Notice : PicoCTF
    Application Record Version : 4
    XMP Toolkit : Image::ExifTool 10.80
    License : cGljb0NURnt0aGVfbTN0YWRhdGFfMXNfbW9kaWZpZWR9
    Rights : PicoCTF
    Image Width : 2560
    Image Height : 1598
    Encoding Process : Baseline DCT, Huffman coding
    Bits Per Sample : 8
    Color Components : 3
    Y Cb Cr Sub Sampling : YCbCr4:2:0 (2 2)
    Image Size : 2560x1598
    Megapixels : 4.1
  2. 2.
    We can decode this string using CyberChef. Paste in the string and drag in the magic block into the recipe.

Flag

picoCTF{the_m3tadata_1s_modified}