Central Identities Data Repository (CIDR) is a government agency in India that stores and manages data for the country's Aadhaar project. CIDR, which is regulated by the Unique Identification Authority of India (UIDAI), is responsible for verifying the authenticity of documents submitted by an individual and that an applicant is actually the person he or she claims to be.
CIDR is tasked with ensuring that the information contained in the Aadhaar cards is unique to each individual and kept updated and relevant. While certain types of information such as birth date and gender will remain unchanged, other demographic details may undergo changes with time. The agency monitors these changes periodically with the assistance of a network of registrars who oversee the initial enrollment process for the issuance of UIDs and subsequent change requests.