He had also invited the Election Commission and political parties to the event, but only Congress leader Kapil Sibal turned up. It is also planning to take legal action against Suja.
"We have only one request that a proper investigation must be done".
Syed Shuja, a US-based cyber "expert" who claimed he was a part of the team at Electronic Corporation of India Ltd (ECIL) that designed and developed EVMs, alleged that the 2014 general elections in India were rigged.
Former Chief Election Commissioner Navin Chawla: I didn't see this hackathon in London & didn't want to see it either, as EVM used there wasn't of Election Commission.
The Foreign Press Association, which describes itself as the oldest association of foreign journalists in the world, said in a tweet on Tuesday that it "strongly dissociates itself" from "any claims made by the speaker Syed Shuja".
Opposition parties in India have been expressing apprehensions about misuse of EVMs, but the Election Commission has strongly refuted such allegations.
The bedrock of a democracy is free and fair elections.
Addressing a press conference in London via Skype, Shuja had claimed he fled India in 2014 because he felt threatened in the country after the killing of some of his team members.
Naidu, the president of the Telugu Desam Party, said the EVMs were turning out to be a "big threat" to democracy and advised his party rank and file to be alert in view of the claims by "hackers".
He said the BJP would have won Rajasthan, Chhattisgarh and Madhya Pradesh elections if his team hadn't intercepted the BJP attempts to hack the transmissions in these states.
Shuja said the hacking was done by pinging EVMs at 7 Hertz, a low military-grade frequency, and that one needed "a graphite-based transmitter" to do the hacking. "Gopinath Munde was murdered as he knew about the hacking in EVMs", he said in an interaction through tele-conferencing from the US.
Shuja, who claims to be part of the team that designed EVMs used in India, alleged that the Congress lost 210 seats in 2014 general election "due to tampering".
The poll panel said it was "wary of becoming a party to this motivated slugfest and stands by empirical facts about the foolproof nature of EVMs".
Hours later, the FPA too rubbished Shuja's claims.
Dr Rajat Moona, the top technical expert with the Commission, had told NDTV that EVMs are "stand-alone machines which have absolutely no capability of transmitting or receiving any data through any wireless communication of any sort", which is why they are "tamper proof".
In the complaint, the EC said that all the "elections to the Lok Sabha and Vidhan Sabha are conducted with the Electronic Voting Machines (EVMs) manufactured by ECIL and BEL", both Public Sector Undertakings. Apart from Sibal, no other leader from the Congress or any other political party was present.