Using Zip Encrytion after zip

[AnthonyCian]

Hi,

Is it possible to encrypt an existing zip file after it has been zipped normally, without unzipping and rezipping it back? There are times I forget to encrypt a zip file until after it has been zipped. Using the Internal Built In...
Thanks, Anthony

[MVV]

You can't modify existing archive by encrypting files in it.

Encryption is applied to packed file streams so it is possible in theory but I doubt there is an application that supports it.

[ZoSTeR]

You could just rezip the archive with compression=0 (store) to speed things up but that leaves you with a zip in a zip file.

WinRar has a "convert archive" function which could be convenient if you've got several zip files to repack/encrypt.

[AnthonyCian]

Thanks, I was afraid of that and was hoping there was a way to encrypt zip files after the fact.
AC