Limit 1 vote per IP Address?

Question

What I really want is to limit 1 vote per person but the next best thing i can think of is limit 1 vote per IP address to prevent malicious users/hackers from severely tempe

Answer 1

Another way to 'help' avoid cheating is to provide a 1 time use hash into the form then check if that's is valid before you count the vote.

For example:

When you create the voting form you make a random hash and store it in the database and put it in the form as a hidden field. (might want to add a date field to the hash database to you can clean up the unused hashes)

Then when you get a vote POST request you can check if the supplied hash is in the database and remove it from the database so it cant be used again.

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CONS:
Might load the database with high IO if the voting page has high traffic.
Can't cache the page as plan html so it puts more stress on the web app.