Preventing Multiple voting without using Ip addresses

[tommyt]

I am trying to build aan opinion polling system in an environment where the net is not available. How can I prevent multiple voting using the student Ids. Many students can vote from one computer.

[harshmaul]

Make the students log in before they can place a vote. and when you record the vote, record the student ID, and then don't allow that ID to vote again.

[pedalpete]

actually, you don't even need a login, just get the student ID when you get the vote and store the studentID as 'used'.

[harshmaul]

That is true. However... If the ID's are guessable people can log many votes or whaterver by guessing others userIDs.

I think we have ascertained the solution tho, you need to log userIDs, whether behind a login page or not :)