As Americans go to the polls today, a record number of counties -- almost one fifth by some estimates -- will be tallying the votes on electronic voting machines. But some experts worry that despite rigorous testing, the machines may not be as secure as their makers promise. . . .

As Americans go to the polls today, a record number of counties -- almost one fifth by some estimates -- will be tallying the votes on electronic voting machines. But some experts worry that despite rigorous testing, the machines may not be as secure as their makers promise.

"People have jumped on the electronic voting bandwagon, thinking that will solve the problems," said Avi Rubin, a technology security expert and researcher at AT&T Labs in New Jersey. "But these systems are largely untested."

The problem, say critics, is that the software which runs the machines is proprietary, and therefore not open to public scrutiny. Without scientists being able to freely analyze the systems, election officials may be leaving themselves open to the possibility of hacking, vote tampering or incorrect calculations.

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