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Your first line of deduping will be cookies. When there's no cookie present, also check against (user agent, IP) pairs; remarkably unique at web scale. The chan
by dangrossman 15y ago
Your first line of deduping will be cookies. When there's no cookie present, also check against (user agent, IP) pairs; remarkably unique at web scale. The chances of two people with the same browser on the same OS with the same plugins behind the same IP address hitting a random website are very small, and collateral damage is limited to not letting two people at a very IT-homogenous corporation vote on the same item.
- bradbeattie 15y agoYour method of detecting duplicate ballots is also subject to the vulnerability of false negatives if one person votes once on two different machines. There's no good way to protect against this. Further, useragent/IP pairs are easily bypassed by forging a false user agent string.