Why must cookies be enabled to log in?

I've given my students the URL with access code for my pbwiki. But they are denied access with the following message: "You do not have cookies enabled. Please enable cookies to log in."

Many of my students are concerned about privacy/security and do not want to enable cookies. Isn't there any way for them to log in without cookies enabled?
 
indifferent I’m looking for a different way
Inappropriate?
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