MUMBAI (Reuters) – As India gears up to build the largest biometric database in the world with the aim of providing most of its 1.2 billion citizens a Unique Identification (UID), perhaps the biggest challenge is smudged fingerprints. The UID Authority of India will issue the first UIDs linked to a person's demographic and biometric information between August and February, and issue about 600 million such IDs over the next five years to help verify citizens quickly and cheaply. It will be a boon for companies and government agencies alike. It would give millions of Indians the means to open...