C-DAC offers its eSign service, named e-Hastakshar to Aadhaar holders with registered mobile numbers

• Using Aadhaar OTP (One Time Password) or Biometric (Finger Minutiae) based e-KYC services to authenticate the document signer.
• Using OTP (One Time Password) and PIN based e-KYC services to authenticate the document signer.

The various stakeholders involved in the process include the Application Service Provider (ASP), eSign Service Provider (ESP), the Certifying Authority (CA), Unique Identification Authority of India (UIDAI) and eKYC provider. All these stakeholders together ensure that an Aadhaar holder is enabled to sign a document through eSign services.

C-DAC is an ESP and offers services to various ASPs. In order to register as an ASP with C-DAC ESP (e-Hastakshar), the corresponding organization needs to carry out certain necessary steps including integration of their application(s) with e-Hastakshar. The integrations is based on the four levels of integration processes.

eSign service is exposed as stateless service over HTTPS. Usage of an open data format such as XML and widely used protocol such as HTTP allows easy adoption and deployment of this service. Currently C-DAC ESP is supporting Online eKYC (eSign 2.1) and offline eKYC (eSign 3.0) Version.

ASP initiates eSign request and ESP authenticates document signer for e-KYC before eSign. e-Hastakshar facilitates authentication of document signer by calling authentication URL of C-DAC ESP. The e-KYC response shall be received by e-Hastakshar and it shall perform eSign on the eSign request received from ASP.

eSign Workflow (Aadhaar eKYC)

Flow of eSign process using this option is shown in below figure.

eSign using e-KYC Aadhaar made by e-Hastakshar

eSign (Aadhaar eKYC) supports the submission of e-Sign request XML from ASP Client browser through HTML Form data , Script based and Android APK to re-direct to ESP authentication page.

eSign Workflow (Offline eKYC Mode based on Aadhaar eKYC XML)

Flow of eSign process using this option is shown in below figure

eSign using e-KYC C-DAC made by e-Hastakshar

eSign(Offline eKYC Mode based on Aadhaar eKYC XML) supports the submission of e-Sign request XML from ASP Client browser through HTML Form data to re-direct to ESP authentication page.

For more details regarding On-Boarding process, kindly contact ess@cdac.in