Ubuntu – Does Ubuntu come with a zip file extracter

You should be able to use unzip's -d option to set an alternate directory for the archive contents.

unzip -d a a.zip
unzip -d b b.zip

and so on. Within a find expression, you should be able to derive the name for the directory from the name of the zipfile using shell parameter expansion e.g.

find . -name '*.zip' -exec sh -c 'unzip -d "${1%.*}" "$1"' _ {} \;

Test it first by adding an echo i.e.

find . -name '*.zip' -exec sh -c 'echo unzip -d "${1%.*}" "$1"' _ {} \;

or something like

while read -rd $'\0' f; do 
  unzip -d "${f%.*}" "$f"
done < <(find . -name '*.zip' -print0)

To create an encrypted zip file in Ubuntu 18.04, open up "Archive Manager" (file-roller), click on the top menu (labelled "Archive Manager"), and select "New Archive". Designate the name and destination for your new archive, and change to extension to .zip. Under the "Other Options" sub-menu, create a password, thereby encrypting the archive. Click "Create", then drag or select the specified files into place, and you're done.