Aadhaar E-Sign is an online electronic signature service in India to facilitate an Aadhaar holder to digitally sign a document. Aadhaar E-Signs are recognised as an accepted method of secure electronic signatures as part of the Second Schedule of the Information Technology Act, 2008 (IT Act). As per Section 67A of the Indian Evidence Act, 1872, in case of Aadhaar E-sign, one does not need to prove that the authenticity of the digital signature of the subscriber. The signature service is facilitated by authenticating the Aadhaar holder via the 12 digit Aadhaar number OR 16 digit virtual ID issued by UIDAI.