[patall]

Yes but that is not the point. You can also add votes to electronic voting by just allowing someone to cast more votes at it. But the difference is that with paper voting, you as a single actor can only influence one voting booth, while as a hacker, you can manipulated thousands of voting machines. So the influence of a single actor could be much bigger. Furthermore, while you can manipulate a paper ballot, you can only do so so long as an investigator is not looking. If he keeps the booth in view the whole time, you cannot add anything or change votes or whatever. A computer can not be surveyed that way because I do not see what happens inside as long as its not open source code and hardware which is signed etc.

[sandworm101]

>> ...with paper voting, you as a single actor can only influence one voting booth, while as a hacker, you can manipulated thousands of voting machines.

That depends where the person is. The people managing the process, those doing the counting, have plenty of opportunity for large manipulations. There are safeguards, but the possibility remains and must be accounted for.

[patall]

As I know it, you have 2-3 persons that count together one urn. That's not one person doing it. And you can do recounts. And adding large numbers of ballot papers is not easy because its marked how many there are in a ballot. (What is more effective is declaring a number of ballots invalid if they are not the right candidate but still, we are speaking about in extrem cases 100 votes, not possibly millions as would be possible in hacking an electronic voting machine)

[pvaldes]

One fake vote can be enough if winner takes all.

[patall]

Sure, but that is a problem of "winner takes all" and not any voting method.