[ CSAW CTF Quals 2012 - Forensics 200 #0x01 ]

For Forensics 200 Challenge #0x01, we were given an image as shown below:

Original link to image:
https://csawctf.poly.edu/challenges/45b963397aa40d4a0063e0d85e4fe7a1/961c734bdd95c5b1e06cbae8c548ac04/version1.png

Using PNGCheck against the given image, we found that there is a CRC error in the tEXt chunk.

So running pngcheck.exe -7 version1.png, we found out where is the CRC error.

Using "takeuchi gregory" as the key, we solved this particular challenge. :D

Cheers,
Jacob Soo