Digital Signature Certificates (DSC) are the digital equivalent (that is electronic format) of physical or paper certificates. Certificates serve as proof of identity of an individual for a certain purpose. Physical documents are signed manually, similarly, electronic documents, for example e-forms are required to be signed digitally using a Digital Signature Certificate. The Digital Signature Certificate is valid for a period of 2 years. There are 3 types of Digital Signatures, Class I, Class II and Class III Digital Signatures. Class I Digital Signature is used for securing email communications. Class II digital signature is utilized for company registrations, IT Return E-filing, Obtaining DIN, DPIN etc. Class III digital signature registration are used for E-tendering and participating in E-Auctions.