Though the four-hour challenge began at 10 am, the NCP and the CPI(M), the only parties participating in the event, were yet to try their hand at hacking the electronic voting machines even after three hours.
While the CPI(M) delegation watched a demonstration on the various security checks involved with the machines, the NCP team interacted with Commission's technical committee of experts.
The four-hour challenge is to end at 2 pm.
The two parties have been provided with four EVMs each brought to Delhi from Punjab, Uttar Pradesh and Uttarakhand where they were deployed in the recently-held assembly polls.
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The EC has maintained that EVMs are tamper-proof.
The BSP and the AAP had alleged that the machines used in the recent assembly elections were tampered with and favoured the BJP. Later, several other parties had joined the chorus and wanted the EC to revert to paper ballots.
The Commission has pulled out from its strong rooms in Uttar Pradesh, Punjab and Uttarakhand electronic voting machines used in the recent assembly polls there for the challenge.
Even foreign experts are barred.
Members of a technical committee, which helps the EC evaluate the EVMs, would judge the proceedings.