After connecting a home-made device to a machine, University of Michigan researchers were able to change results by sending text messages from a mobile.
 
Indian election officials say their machines are foolproof, and that it would be very difficult even to get hold of a machine to tamper with it.
 
India uses about 1.4m electronic voting machines in each general election.
 
'Dishonest totals'
 
A video posted on the internet by the researchers at the University of Michigan purportedly shows them connecting a home-made electronic device to one of the voting machines used in India.
 
Professor J Alex Halderman, who led the project, said the device allowed them to change the results on the machine by sending it messages from a mobile phone.
 
"We made an imitation display board that looks almost exactly like the real display in the machines," he told the BBC. "But underneath some of the components of the board, we hide a microprocessor and a Bluetooth radio."
 
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There is a growing movement in India challenging the continued use of electronic voting.  Here is a site created by Narasimha Rao in India, author of a book entitled: Democracy at Risk:

http://www.indianevm.com/

 
This site presents an independent scientific study about the security of the electronic voting machines (EVMs) used in India.
http://www.indiaevm.org