Aadhaar Card Validator
Online Indian Aadhaar Card validator. Verify format and Verhoeff check digit.
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How does Aadhaar Card validation work?
Validation checks if the number has exactly 12 digits, if the first character is not '0' or '1', and executes the complex geometric check of the Verhoeff algorithm.
The Verhoeff algorithm uses dihedral group D5 multiplication tables, positional permutations, and inverses to verify if the final checksum is zero. This logic is highly robust at detecting transposition errors.