This. Additionally, there's another very important factor to consider: If it is doable (it probably is), the result would be unnecessarily complex. Not only sho

This. Additionally, there's another very important factor to consider: If it is doable (it probably is), the result would be unnecessarily complex. Not only should such a system track votes in an anonymized fashion, it must also be reviewable by the public (how do you know the central server didn't just throw away your vote?). An important part in reviewability is simplicity: If you come up with an algorithm that provides all those properties but requires a PhD in mathematics to be properly understood, guess where Average Joe tells you to stick it. It's very hard to build trust with a screen that essentially just tells you "We did everything correctly! Honest!".