Problem
Find the flag in this picture. You can also find the file in /problems/so-meta_6_8d7541b8d04bd65a01336fdb8db6db24.
Hint
What does meta mean in the context of files?
Ever hear of metadata?
Solution
The hints leads you to find metadata in the given picture. exiftool does the job.
$ exiftool pico_img.png
ExifTool Version Number : 11.70
File Name : pico_img.png
Directory : .
File Size : 106 kB
File Modification Date/Time : 2019:11:08 02:32:36+00:00
File Access Date/Time : 2019:11:08 02:32:35+00:00
File Inode Change Date/Time : 2019:11:08 02:32:59+00:00
File Permissions : 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
Warning : [minor] Text chunk(s) found after PNG IDAT (may be ignored by some readers)
Artist : picoCTF{s0_m3ta_505fdd8b}
Image Size : 600x600
Megapixels : 0.360
There's your flag :)
Flag
picoCTF{s0_m3ta_505fdd8b}