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picoCTF - So Meta


It is the same as this problem and this one but instead of encoded in base64, it’s hidden in plain sight

strikingsoul@ramones:~/Downloads$ exiftool pico_img.png 
ExifTool Version Number         : 12.76
File Name                       : pico_img.png
Directory                       : .
File Size                       : 109 kB
File Modification Date/Time     : 2026:01:26 12:29:49+07:00
File Access Date/Time           : 2026:01:26 12:29:49+07:00
File Inode Change Date/Time     : 2026:01:26 12:29:49+07:00
File Permissions                : -rw-rw-r--
File Type                       : PNG
File Type Extension             : png
MIME Type                       : image/png
Image Width                     : 600
Image Height                    : 600
Bit Depth                       : 8
Color Type                      : RGB
Compression                     : Deflate/Inflate
Filter                          : Adaptive
Interlace                       : Noninterlaced
Software                        : Adobe ImageReady
XMP Toolkit                     : Adobe XMP Core 5.3-c011 66.145661, 2012/02/06-14:56:27
Creator Tool                    : Adobe Photoshop CS6 (Windows)
Instance ID                     : xmp.iid:A5566E73B2B811E8BC7F9A4303DF1F9B
Document ID                     : xmp.did:A5566E74B2B811E8BC7F9A4303DF1F9B
Derived From Instance ID        : xmp.iid:A5566E71B2B811E8BC7F9A4303DF1F9B
Derived From Document ID        : xmp.did:A5566E72B2B811E8BC7F9A4303DF1F9B
Artist                          : picoCTF{s0_m3ta_9a8b5aa1}
Image Size                      : 600x600
Megapixels                      : 0.360

The flag is picoCTF{s0_m3ta_9a8b5aa1}

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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

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