The Reserve bank of India has now made it mandatory for the Credit/Debit card Holders to link their Aadhaar Card to their Cards.

“The Reserve Bank of India has made it mandatory for banks to implement Aadhaar authentication for card transactions at merchant locations.
The central bank said “all new card’s present infrastructure” has to be enabled for recent security measures, including an embedded EMV chip and a mandatory PIN, besides Aadhaar validation at point of sale (PoS) terminals.
Aadhaar is currently used by banks to establish identity while opening bank accounts, which can then be used to make sur ..
http://economictimes.indiatimes.com/articleshow/26434025.cms?utm_source=contentofinterest&utm_medium=text&utm_campaign=cppst


Very nice article on Aadhaar Card UID
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RBI directive to compulsorily authenticate Aadhar Card and link various benefits to Aadhar is violative of directions given by the Hon’ble Supreme Court of India which is hearing a PIL against Aadhar. This card has no legal or constitutional sanction.On the contrary there are security concerns about this card because they have assigned the task of data collection to private agencies who have no security mechanism to safeguard the data. Moreover sharing personal biometric details with such private agencies is susceptible to misuse.
Your concerns are well founded.As things stand Aadhaar , as of now, has no legal sanctity.
I expect this to be conferred with legal stamp.
Despite all the valid fears about privacy, Aadhhar has come to say.
As with Internet, Data collection is something we can not do much about it being shared unless who collect are morally upright, which I doubt.