Ankaji Bhai Gangar, a 49-year-old subsistence farmer, stood in line in this remote village until, for the first time in his life, he squinted into the soft glow of a computer screen. His name, year of birth and address were recorded. A worker guided Mr. Gangar’s rough fingers to the glowing green surface of a scanner to record his fingerprints. He peered into an iris scanner shaped like binoculars that...

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