Naturally it varies dramatically based on the compressibility of the original files. That means that even when a ZIP file contains only a single file, it’s very possible that the ZIP file will be smaller than the file it contains. Rather than sending 50 separate documents as 50 separate files, you can instead create a ZIP file that contains them all, and send that single file. By bundling multiple files, and even folders, into a single container file, distribution, archival and organization of large numbers of files becomes more simple.Unfortunately with that ubiquity comes the potential for abuse.Īnd that’s exactly what spammers like to do.Ī ZIP file is a container for other files.Īt their most basic, ZIP files solve two problems in a very simple way: ZIP files are everywhere, and have a lot of very valid uses. The ZIP file is the spammer’s – or rather the phisher’s – best friend.
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