Tuesday, October 2, 2012

CSAW CTF Quals: Forensics 200 - 1

Quite a simple challenge.

When you put the version1 file into a program called tweakPNG, it gave you an error for the wrong checksum at a certain location. That checksum was for the name takeuchi gregory. Given the picture was a picture of words saying “one of these things is not like the other,” I assumed that the wrong checksum is what made that name different, and that that name was the key. It was.

-- syreal

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