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Nickel.zip -

Most modern operating systems and security software have evolved to neutralize threats like "nickel.zip":

: In a corporate environment, sending a zip bomb to a server that automatically scans attachments can take the entire mail server offline.

While "nickel.zip" is a newer or alternative naming convention, it follows the lineage of the famous .

: Scanners are now programmed to stop looking after a certain number of layers (e.g., 5 or 10 deep).

The file is structured like a "nesting doll." Inside the main ZIP file are 16 smaller ZIP files. Inside each of those are 16 more, and so on.