DNA: How to identify deepfake videos?

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Today was the first phase of Lok Sabha elections. Voting took place today on 102 seats in 21 states. The parties have now started campaigning for the second phase. This time technology is being used extensively in the election campaign. But at the same time, technology is also being misused in the election campaign. A few days ago, a deepfake video of Aamir Khan went viral in which he was seen asking for votes for the Congress party. Now a similar deepfake video of Ranveer Singh is also going viral.