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use tools
- Winhex
Thinking about review
Download the attachment and decompress it as a picture
No results for viewing properties, opening notepad, and opening ps
It is found that the size of the
picture is 500x420. I guess the picture has been modified to hide the flag.
Try to use Winhex to change the size to a 500x500 square image
Problem solving process
Use Winhex to open the picture and
find the following fields on the second line,
where the red frame is the length of the picture, and the blue frame is the width of the picture.
Unit: pixel data type: hexadecimal
According to the query: 1F4 is decimal 600, 1A4 is decimal 420
Modify 1A4 to 1F4 to save
Get the complete image and FLAG
flag：BUGKU{a1e5aSA}
Finish
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