Download 445k: Zip

: This is the definitive modern write-up. Fifield explains how to create a "non-recursive" zip bomb that achieves high compression ratios without nesting files, making it much more dangerous for scanners. You can find his full research and graphs on his personal site .

It sounds like you're looking for the famous "44.5 KB" zip bomb (often rounded to 45K or 44K) and its technical write-up. Download 445K zip

: It consists of 5 levels of nested zip files. The bottom level contains 16 files, each being 4.3 GB of zeros, which compress incredibly well. : This is the definitive modern write-up