picoCTF - information

• URL: https://play.picoctf.org/practice/challenge/186
• Title: information
• Tags: Easy, Forensics, picoCTF 2021
• Author: SUSIE
• Started: 15 July 2025
• Solved: 15 July 2025
• Description: Files can always be changed in a secret way. Can you find the flag? cat.jpg

It is the same problem as CanYouSee but instead of Attribution URL, the field is “license”

strikingsoul@ramones:~/Downloads$ exiftool cat.jpg 
ExifTool Version Number         : 12.76
File Name                       : cat.jpg
Directory                       : .
File Size                       : 878 kB
File Modification Date/Time     : 2026:01:26 12:25:50+07:00
File Access Date/Time           : 2026:01:26 12:25:49+07:00
File Inode Change Date/Time     : 2026:01:26 12:25:50+07:00
File Permissions                : -rw-rw-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

strikingsoul@ramones:~/Downloads$ echo cGljb0NURnt0aGVfbTN0YWRhdGFfMXNfbW9kaWZpZWR9 | base64 --decode
picoCTF{the_m3tadata_1s_modified}

The flag is

picoCTF{the_m3tadata_1s_modified}