Aadhaar

Aadhaar is a 12‑digit, randomly generated identification number linked to the biometric and demographic data of Indian residents. Managed by the Unique Identification Authority of India (UIDAI), it is the world’s largest single‑purpose biometric database, providing a portable proof of identity and address that can be verified online in seconds. As of September 2023, more than 1.34 billion individuals—roughly 99 % of the adult population—have been assigned an Aadhaar number, making it a cornerstone of the nation’s digital public‑service architecture. ## Origins and Legal Framework The UIDAI was established in January 2009 under the Ministry of Electronics & Information Technology, and the Aadhaar enrolment drive began in September 2010 with pilot projects in eight districts. By March 2015, the programme had crossed the 500‑million mark, prompting the Parliament to pass the Aadhaar (Targeted Delivery of Financial and Other Subsidies, Benefits and Services) Act 2016, which gave statutory backing to the number and defined its use for welfare delivery. Section 2 of the Act formally defines “Aadhaar” as a 12‑digit unique identifier, while Section 7 mandates authentication through either OTP‑based or biometric matching. The Supreme Court’s landmark judgment in Justice K.S. Puttaswamy v. Union of India (28 August 2018) upheld the constitutionality of Aadhaar but imposed three key restrictions: (i) it cannot be made mandatory for services unrelated to welfare or subsidies, (ii) private entities may not demand Aadhaar for commercial purposes, and (iii) the state must ensure data protection under the Information Technology Act 2000. Subsequent amendments, notably the Aadhaar (Amendment) Act 2019, introduced Section 12, prescribing penalties of up to ₹1 crore for unlawful disclosure of enrolment data. ## How Aadhaar Works Enrolment captures an individual’s name, date of birth, gender, address, a photograph, ten fingerprints, and two iris scans at authorised centres. UIDAI’s Central Identities Data Repository (CIDR) stores this information in encrypted form and generates a unique 12‑digit number that is never reused. Authentication requests—issued by banks, government portals, or telecom operators—are processed through a secure API that matches the supplied OTP, fingerprint, or iris data against the CIDR, returning a “yes” or “no” within milliseconds. The e‑KYC (electronic Know‑Your‑Customer) service leverages this real‑time verification to replace physical document checks, enabling instant account opening, loan sanctioning, and subsidy claim. UIDAI also provides a “Virtual ID” (VID), a temporary 16‑digit number that can be used in place of the Aadhaar number for added privacy, though the VID must be regenerated for each transaction. All transactions are logged, and audit trails are maintained to satisfy the Act’s accountability requirements. ## Current Implementation and Reach By early 2024, UIDAI reported 1.34 billion active Aadhaar numbers, with enrolment centres operating in every district and mobile enrolment units covering remote villages. The number is linked to over 1.2 billion bank accounts, facilitating Direct Benefit Transfer (DBT) of subsidies such as LPG (the PM‑Kisan scheme), food grains under the Public Distribution System, and pension payments. The Union Cabinet’s approval of the SARTHAK‑PDS programme in 2023 mandated Aadhaar‑linked ration cards to curb leakages, illustrating the system’s integration into state‑level welfare. Aadhaar also underpins the Income Tax Department’s e‑filing portal, where taxpayers can authenticate using OTPs, and the telecom sector, where the Department of Telecommunications requires Aadhaar for new SIM issuance under the “Aadhaar‑based verification” rule. Despite its breadth, the UIDAI maintains a “non‑mandatory” stance for services like school admissions and passport applications, in line with the Supreme Court’s directives. ## Significance and Ongoing Debates Proponents cite the World Bank’s 2018 assessment that Aadhaar‑enabled DBT reduced duplicate subsidy payments by an estimated 30 %, saving the exchequer roughly ₹1.5 lakh crore annually. NITI Aayog’s 2020 report linked Aadhaar to a 20 % increase in financial inclusion, as measured by the rise in bank accounts among low‑income households. Critics, however, point to data‑security incidents—most notably the 2018 “Aadhaar data leak” reported by the Indian Express—and argue that biometric authentication can be error‑prone for elderly or manual‑labour workers. The debate continues over the balance between efficiency and privacy. Legislative proposals such as the Personal Data Protection Bill 2023 seek to codify stricter safeguards for biometric data, while civil‑society groups push for a “right to be forgotten” clause. As India advances its Digital India agenda, Aadhaar remains a