I want a way to securely submit standard spreadsheet data (student grades).
One way would be if we could have a password protected web page, and have a form on it that a user could cut/paste into from their spreadsheet.
But, I am not familiar with a way to paste structured spreadsheet data into a HTML form.
The web page woud then iterate over the rows and make entries into a database.
The main context is that grades originate in a spreadsheet, and we want them to end up in a central database, and have some authentication over submission.