Zip encryption not implemented

As the title says, encryption for zip files was never implemented. I'm not sure if this is intentional or not.

The way I see it, there is no method to set a simple password for the zip (though this is a weaker method in general). My suggestion is to encrypt the JSON file in its entirety and then zip it. However, I'm not sure how this interacts with `sink`.

The issue names no file or test. Start by locating the code that creates the zip and handles sink, then clarify whether the JSON is encrypted before zipping and what password model is supported; done requires an agreed design and verified sink interaction.

Written by the indexing model from the issue text.