We compare only against the older version. The difference is that the newer version requires a password before unzipping. There are two versions of 42.zip, an older version of 42 374 bytes, and a newer version of 42 838 bytes.The construction uses only the most common compression algorithm, DEFLATE, and is compatible with most zip parsers. Even greater expansion is possible using 64-bit extensions. The output size increases quadratically in the input size, reaching a compression ratio of over 28 million (10 MB → 281 TB) at the limits of the zip format. ![]() ![]() "Non-recursive" means that it does not rely on a decompressor's recursively unpacking zip files nested within zip files: it expands fully after a single round of decompression. This article shows how to construct a non-recursive zip bomb that achieves a high compression ratio by overlapping files inside the zip container.
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