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If you're savy enough to do that, then you are also competent enough to send the file in numerous other ways. Your not the target audience.

Also, you wouldn't need add a file. Zipping it alone would be enough to change the hash.




I assumed zipping to be determinative and that a standard gzip would lead to a "known" hash, ergo the idea to create a unknown zip file by adding some bytes.


It would be determinative only if all the header fields[1] stayed identical. A change in something like file name or mod time, would change the hash of the zipped archive without affecting the hash of the actual file.

I don't think you can expect the file mod time to be identical, as it isn't preserved through many forms of file distribution.

[1]https://en.wikipedia.org/wiki/Zip_(file_format)#File_headers




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