Quote:
Originally Posted by darkmonk
Yes - I want to say, there is no method you could ever do that cannot be removed. The most difficult method would simply be a direct alteration of the zip file, that did not impact any of the source files. It would be an incredible exploit, but good luck finding it.
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I think you can just append extra bytes to a valid zip file, with the zip file remaining valid and the extra bytes not being seen anywhere, unless you look for them with an hex editor or similar. Of course, if someone re-creates the zip (because they have modified the metadata to have "Surname, Firstname" instead of "Firstname Surname", for instance), the bytes are lost.