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using an uncompressed png file as attack target #66

@ghylander

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@ghylander

I have an un compressed (store) png file in a zip archive

Knowing the signature of a png file, how do i enter the plain text?

The first eight bytes of a PNG file always contain the following values:

(decimal) 137 80 78 71 13 10 26 10
(hexadecimal) 89 50 4e 47 0d 0a 1a 0a
(ASCII C notation) \211 P N G \r \n \032 \n

plus, scattered around the file there is more known text, like IHDR, IDAT or IEND

How to store this information on the plaintext file?
First, how to enter the signature?
Second, how to create (and use) a plain text file containing non-contigious text?

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