A certifying authority is a body entrusted to issue, revoke, and renew Digital Signature Certificate. The digital signature certificate of the applicant is signed by the CA. Under Sec 24, of the Information Technology Act 2000 a Certifying Authority means a Person who has been granted license to issue Digital Signature Certificates. A list of Valid CA in India can be traced at https://cca.gov.in/cca/?q=licensed_ca.html