FG

Do encrypted compression containers like ZIP and 7-Zip compress or encrypt first?

Fresh3 days ago
Mar 15, 20269247 views
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Problem

The discussion of "compress and then encrypt, or vice-versa" led me to ponder the following question: many compression containers, like , , and support encrypting these containers. For example, when creating a file in 7-Zip, the program lets you enter an encryption password. For these file types, a…

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Fix for: Do encrypted compression containers like ZIP and 7-Zip compress or encrypt first?

Low Risk

I would assume that 7-Zip and other archiving tools compress before they encrypt, for the reasons stated in the linked blog post. But I was unable to find any documentation that confirms that, nor could I immediately ascertain it from looking at the…

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