What are the different classes of Digital Signature Certificates?

In addition to four classes of certificates given below, the Certifying Authority may issue more classes of Public Key Certificates, but these must be explicitly defined including the purpose for which each class is used and the verification methods underlying the issuance of the certificate. The suggested four classes are the following :-

        Class 1 Certificate: Class 1 certificates shall be issued to individuals/private subscribers. These certificates will confirm that user's name (or alias) and E-mail address form an unambiguous subject within the Certifying Authorities database.

        Class 2 Certificate: These certificates will be issued for both business personnel and private individuals use. These certificates will confirm that the information in the application provided by the subscriber does not conflict with the information in well-recognized consumer databases.

        Class 3 Certificate: This certificate will be issued to individuals as well as organizations. As these are high assurance certificates, primarily intended for e-commerce applications, they shall be issued to individuals only on their personal (physical) appearance before the Certifying Authorities.

        Aadhaar eKyc - OTP : Aadhaar OTP class of certificates shall be issued for individuals use based on OTP authentication of subscriber through Aadhaar eKyc. These certificates will confirm that the information in Digital Signature certificate provided by the subscriber is same as information retained in the Aadhaar databases pertaining to the subscriber as Aadhaar holder

        Aadhaar eKyc - biometric: Aadhaar biometric class of certificates shall be issued based on biometric authentication of subscriber through Aadhaar eKyc service. These certificates will confirm that the information in Digital Signature certificate provided by the subscriber same as information retained in the Aadhaar databases pertaining to the subscriber as Aadhaar holder.