The "deep" explanation of how this was achieved can be found on Russ Cox's research site, research!rsc .
: Cox walks through the byte-level construction, including how to handle the checksums (CRCs) that would normally change when the file's content changes. Download 102k zip
: Be careful when opening such files in automated scripts or certain unzipping tools, as recursive archives can sometimes trigger "zip bomb" protections or cause infinite loops if the software tries to extract every nested layer. Zip Files All The Way Down - research!rsc The "deep" explanation of how this was achieved
: The post explains how to construct a zip file that contains its own exact bytes. This is done by exploiting the structure of zip files, specifically how they use "Local File Headers" and "Central Directories" to point to data offsets. Zip Files All The Way Down - research
If you are looking to download the file directly for testing, you can find the link within the original blog post.
