Create a PNG image that has the same XMODEM-CRC as an exiting PNG image

Question

I have a problem which requires me to create a brand new PNG image, that has a same XMODEM-CRC checksum as an existing PNG image.

The new image must have a PNG structure and the exising image's XMODEM-CRC is: 0xC553

I am looking for a way which i can solve the problem or a solution(image that meets the mentioned conditions).

Thank you in advance!

You asked this before and was asked to clarify. – Jongware May 14 '16 at 22:44 — Jongware, May 14 '16 at 22:44

score 0 · Answer 1 · answered May 15 '16 at 14:33

0

Assign 16 bits in a row somewhere in the PNG file that you can change (could be in a PNG comment), and try all 65,536 values until you get the XMODEM CRC you want.

answered May 15 '16 at 14:33

Mark Adler

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Create a PNG image that has the same XMODEM-CRC as an exiting PNG image

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