Sunday, February 10, 2019

Viewing Exif Data - Cal Poly FAST CTF Challenge 2


Question: This is a generic picture. What is the exposure time of this photograph?
Hint: Exiftool may be of some use.
Answer: 1/200



To someone who knows nothing about Exif data, trying to infer an exposure time from a photograph sounds ridiculous. However, this very information is stored in Exif data. Exif data contains metadata about digital cameras, smartphones, and scanners used when creating a JPG, TIFF, or WAV file. This metadata can even sometimes include GPS coordinates. As the hint explains, Exiftool can be used to view this metadata (https://sno.phy.queensu.ca/~phil/exiftool/). Run Exiftool with no parameters and path to the file.





Among so much more information that was cut off from this screenshot, we can see the exposure time was 1/200.


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