![]() ![]() The zip bomb had gone and the server response changed to just hello.Ĭompression bombs that use the zip format Someone uncompressed and re-compressed the original in a different time zone. Which makes me suspect that at some point In fact, it is exactly 8 hours behind the 42.zip I used, The top "lib" level jumps 8 hours backwards. The timestamps increase as you go from the bottom level to the top, I suspect it is less original than the one I used, Its total compressed size is 42 790 bytes This 42.zip is a little different than the one I compared against. The Wayback Machine has a copy timestamped The web server there naturally serves a copy of 42.zip. We compare only against the older version.Ĥ2.zip but haven't been able to find a source- let me know The difference is that the newer version requires a password before unzipping. Source code: git clone zipbomb-20210121.zip Data and source for figures: git clone The construction uses only the most common compression algorithm, DEFLATE, Reaching a compression ratio of over 28 million The output size increases quadratically in the input size, It expands fully after a single round of decompression. "Non-recursive" means that it does not rely onĪ decompressor's recursively unpacking zip files nested within zip files: ![]() Overlapping files inside the zip container. ![]() That achieves a high compression ratio by ![]()
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