DSC (Digital Signature Certificate) is a private digital secure key that certifies the identify of a holder. It is issued by a  Certifying Authority and valid across different Govt platforms. The Digital Signature Certificate contains details such as Name, Email, Country and a Public Key of a holder). Digital Signature Certificate uses Public Key Infrastructure meaning data that has been digitally signed or encrypted by private key that only be decrypted by its public key. A Digital Signature is a secure key (USB E-Token) that contain in digital format and is issued for the purpose of validating a identity of a person or entity. These tokens are often issued with a validity period of 1 to 2 years and required to be re-made thereafter.