'There are several committees, including those of IIT (Indian Institutes of Technology) professors, which verify the EVMs here. We are totally satisfied with the performance of EVMs. They are tamper proof,' he added.

Quraishi said that the EVMs were first used in India in the 2004 general elections.

'There have been one Supreme Court and four high court judgments in the favour of EVMs. Our EVMs are adding machines with a unique software. We can only add. We cannot manipulate them,' he said.

The BJP, which was hoping to capture power at the centre in the May 2009 general elections, fared badly at the polls and got less than 120 seats in the Lok Sabha. The Congress, which led the United Progressive Alliance (UPA) coalition at the centre between 2004-2009, returned to power with an improved performance, winning over 200 Lok Sabha seats.