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Problem
Files can always be changed in a secret way. Can you find the flag? cat.jpg
​cat.jpg​
​Source​
Solution
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.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}

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