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15 March 2021
Pollex
Challenge Source: NahamCon CTF 2021Challenge Category: warmups
Challenge Text
Author: @JohnHammond#6971
👍
Download the file below.
Some people seem to have trouble reading this, understandably so. Sorry. The flag ends in these characters: 8fe36bc00}
Solution
- Opening the image file provided, nothing seems out of place. However, if we look closely at the thumbnail theres a flag hidden there:
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Let’s not fall for John Hammond’s pro trolling attempts by using our biggest monitor and accessibility settings to try to see the image as it appears in our folder or taking screenshots and trying to zoom in via some image editor. (Yes, I may have done this at first…)
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Instead, we can easily see the flag clearly using exiftool to extract the thumbnail image: