The apex court said that this apprehension of the public has to be assuaged by the government by taking proper measures so that people are confident that there would be no chance of "unauthorised leakage" of data.
A bench comprising justices A K Sikri and Ashok Bhushan said the measures to be taken can range from "tightening the operations of the contractors who are given the job of enrollment, they being private persons, or by prescribing severe penalties to those who are found guilty of leaking the details".
"It is also necessary to highlight that a large section of citizens feel concerned about possible data leak, even when many of those support linkage of PAN with Aadhaar. This is a concern which needs to be addressed by the government.
"It is important that the aforesaid apprehensions are assuaged by taking proper measures so that confidence is instilled among the public at large that there is no chance of unauthorised leakage of data...
The observations came while upholding the validity of a law making Aadhaar mandatory for allotment of PAN and filing of Income Tax (I-T) returns.
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