30
Sep
2012

CSAW 2012 – Forensics 200 – 2

No challenge description.
https://csawctf.poly.edu/challenges/45b963397aa40d4a0063e0d85e4fe7a1/f8c64a70ad468a2fd3d9fa1e37c6b034/version2.png

In this challenge we got a similar file to the Forensics 200 – 1 challenge. Again the same image:

Since we figured out how to solve Forensics 200 – 1, we decided to use the same tool we used on that challenge. But now it seemed all the tEXt.comment parts contained CRC errors.

Tool output:

O:\png_check>pngcheck.exe -f -7  ../version2.png >> ../version2_output.txt

<snip>
    key{jeremy socorrito}
../version2.png  CRC error in chunk tEXt (computed bcb8529b, expected 9b52b8bc)
comment:
    key{johnnie tigger}
comment:
    key{panzer merton}
../version2.png  CRC error in chunk tEXt (computed 86eb7879, expected 7978eb86)
comment:
<snip>

There seems to be only one tEXt comment without a CRC error: johnnie tigger

KEY: johnnie tigger

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