It does not count filenames or other filesystem metadata,
#BETTERZIP TORRENT ZIP FILE#
Of all the files contained the in the zip file,ĭivided by the size of the zip file itself. We define the compression ratio as the the sum of the sizes Parse in one pass without first consulting the zip file's central directory. The exceptions being "streaming" parsers that
Is not directly portable to other file formats or compression algorithms. The construction depends on features of both zip and DEFLATE-it
The compression ratio gets better as the bomb gets bigger. The zip bomb's output size grows quadratically in the input size i.e., In order to reference a "kernel" of highly compressed data It works by overlapping files inside the zip container, Whose compression ratio surpasses the DEFLATE limit of 1032.
#BETTERZIP TORRENT HOW TO#
This article shows how to construct a non-recursive zip bomb If all six of its layers are recursively unzipped,Īnd thus expand infinitely if recursively unzipped,Īre likewise perfectly safe to unzip once. Nesting zip files within zip files to get an extra factor of 1032 with each layer.īut the trick only works on implementations that The compression algorithm most commonly supported by zip parsers,Ĭannot achieve a compression ratio greater than 1032.įor this reason, zip bombs typically rely on recursive decompression, Someone uncompressed and re-compressed the original in a different time zone.Ĭompression bombs that use the zip format 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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